Example 1: C program to check perfect number
What is perfect number?
Perfect number is a positive number which sum of all positive divisors excluding that number is equal to that number. For example 6 is perfect number since divisor of 6 are 1, 2 and 3. Sum of its divisor is
1 + 2+ 3 =6 Note: 6 is the smallest perfect number.
Next perfect number is 28 since 1+ 2 + 4 + 7 + 14 = 28
Some more perfect numbers: 496, 8128
#include<stdio.h>
int main(){
int n,i=1,sum=0;
printf("Enter a number: ");
scanf("%d",&n);
while(i<n){
if(n%i==0)
sum=sum+i;
i++;
}
if(sum==n)
printf("%d is a perfect number",i);
else
printf("%d is not a perfect number",i);
return 0;
}
Sample output:
Enter a number: 6
6 is a perfect number
Similar Example:
Write a c program to check given number is perfect number or not.
Tips:
if(sum==n)
printf(“%d is a perfect number”,i);
else
printf(“%d is not a perfect number”,i);
Example 2: How to print prime numbers from 1 to 100 in c
Definition of prime number:
A natural number greater than one has not any other divisors except 1 and itself. In other word we can say which has only two divisors 1 and number itself. For example: 5
Their divisors are 1 and 5.
Note: 2 is only even prime number.
Logic for prime number in c
We will take a loop and divide number from 2 to number/2. If the number is not divisible by any of the numbers then we will print it as prime number.
Example of prime numbers : 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199 etc.
#include<stdio.h>
int main(){
int num,i,count;
for(num = 1;num<=100;num++){
count = 0;
for(i=2;i<=num/2;i++){
if(num%i==0){
count++;
break;
}
}
if(count==0 && num!= 1)
printf("%d ",num);
}
return 0;
}
Output:
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
Write a c program to check whether a number is strong or not
Definition of strong number:
A number is called strong number if sum of the factorial of its digit is equal to number itself. For example: 145 since
1! + 4! + 5! = 1 + 24 + 120 = 145
#include<stdio.h>
int main(){
int num,i,f,r,sum,temp;
int min,max;
printf("Enter minimum range: ");
scanf("%d",&min);
printf("Enter maximum range: ");
scanf("%d",&max);
printf("Strong numbers in given range are: ");
for(num=min; num <= max; num++){
temp = num;
sum=0;
while(temp){
i=1;
f=1;
r=temp%10;
while(i<=r){
f=f*i;
i++;
}
sum=sum+f;
temp=temp/10;
}
if(sum==num)
printf("%d ",num);
}
return 0;
}
Sample output:
Enter minimum range: 100
Enter maximum range: 100000
Strong numbers in given range are: 145 40585
C program for odd or even number
Algorithm:
Number is called even number if it is divisible by two otherwise odd.
Example of even numbers: 0,2,4,8,9,10 etc.
Example of odd numbers: 1, 3,5,7,9 etc.
- C program to check even or odd
- C determine odd or even
- How to check odd number in c
- How to determine odd or even in c
- C even odd test
#include<stdio.h>
int main(){
int number;
printf("Enter any integer: ");
scanf("%d",&number);
if(number % 2 ==0)
printf("%d is even number.",number);
else
printf("%d is odd number.",number);
return 0;
}
Sample output:
Enter any integer: 5
5 is odd number.
check the given number is palindrome number or not using c program
- Write a c program for palindrome
- C program to find palindrome of a number
- Palindrome number in c language
#include<stdio.h>
int main(){
int num,r,sum,temp;
int min,max;
printf("Enter the minimum range: ");
scanf("%d",&min);
printf("Enter the maximum range: ");
scanf("%d",&max);
printf("Palindrome numbers in given range are: ");
for(num=min;num<=max;num++){
temp=num;
sum=0;
while(temp){
r=temp%10;
temp=temp/10;
sum=sum*10+r;
}
if(num==sum)
printf("%d ",num);
}
return 0;
}
Sample output:
Enter the minimum range: 1
Enter the maximum range: 50
Palindrome numbers in given range are: 1 2 3 4 5 6 7 8 9 11 22 33 44
Code 3: How to check if a number is a palindrome using for loop
#include<stdio.h>
int main(){
int num,r,sum=0,temp;
printf("Enter a number: ");
scanf("%d",&num);
for(temp=num;num!=0;num=num/10){
r=num%10;
sum=sum*10+r;
}
if(temp==sum)
printf("%d is a palindrome",temp);
else
printf("%d is not a palindrome",temp);
return 0;
}
Sample output:
Enter a number: 1221
1221 is a palindrome
Code 4: C program to check ifa number is palindrome using recursion
#include<stdio.h>
int checkPalindrome(int);
int main(){
int num,sum;
printf("Enter a number: ");
scanf("%d",&num);
sum = checkPalindrome(num);
if(num==sum)
printf("%d is a palindrome",num);
else
printf("%d is not a palindrome",num);
return 0;
}
int checkPalindrome(int num){
static int sum=0,r;
if(num!=0){
r=num%10;
sum=sum*10+r;
checkPalindrome(num/10);
}
return sum;
}
Sample output:
Enter a number: 25
25 is not a palindrome
Write a c program to check given string is palindrome number or not
Definition of Palindrome string:
A string is called palindrome if it symmetric. In other word a string is called palindrome if string remains same if its characters are reversed. For example: asdsa
If we will reverse it will remain same i.e. asdsa
Example of string palindrome: a,b, aa,aba,qwertrewq etc.
#include<string.h>
#include<stdio.h>
int main(){
char *str,*rev;
int i,j;
printf("\nEnter a string:");
scanf("%s",str);
for(i=strlen(str)-1,j=0;i>=0;i--,j++)
rev[j]=str[i];
rev[j]='\0';
if(strcmp(rev,str))
printf("\nThe string is not a palindrome");
else
printf("\nThe string is a palindrome");
return 0;
}
TO FIND FIBONACCI SERIES USING C PROGRAM
Code 1:
- Write a program to generate the Fibonacci series in c
- Write a program to print Fibonacci series in c
- Basic c programs Fibonacci series
- How to print Fibonacci series in c
- How to find Fibonacci series in c programming
- Fibonacci series in c using for loop
#include<stdio.h>
int main(){
int k,r;
long int i=0l,j=1,f;
//Taking maximum numbers form user
printf("Enter the number range:");
scanf("%d",&r);
printf("FIBONACCI SERIES: ");
printf("%ld %ld",i,j); //printing firts two values.
for(k=2;k<r;k++){
f=i+j;
i=j;
j=f;
printf(" %ld",j);
}
return 0;
}
Sample output:
Enter the number range: 15
FIBONACCI SERIES: 0 1 1 2 3 5 8 13 21 34 55 89 144 233 377
What is Fibonacci series?
Logic of Fibonacci series Definition of Fibonacci numbers:
We assume first two Fibonacci are 0 and 1. A series of numbers in which each sequent number is sum of its two previous numbers is known as Fibonacci series and each numbers are called Fibonacci numbers. So Fibonacci numbers is
Algorithm for Fibonacci series
Fn = Fn-2 + Fn-1
Example of Fibonacci series:0 , 1 ,1 , 2 , 3 , 5 , 8 , 13 , 21 , 34 , 55 …
5 is Fibonacci number since sum of its two previous number i.e. 2 and 3 is 5
8 is Fibonacci number since sum of its two previous number i.e. 3 and 5 is 8 and so on.
TO FIND FACTORIAL OF A NUMBER USING C PROGRAM
Factorial value
Factorial of number is defined as:
Factorial (n) = 1*2*3 … * n
For example: Factorial of 5 = 1*2*3*4*5 = 120
Note: Factorial of zero = 1
- C code for factorial of a number
- C program to find the factorial of a given number
- Factorial program in c using while loop
4.Factorial program in c without using recursion
#include<stdio.h>
int main(){
int i=1,f=1,num;
printf("Enter a number: ");
scanf("%d",&num);
while(i<=num){
f=f*i;
i++;
}
printf("Factorial of %d is: %d",num,f);
return 0;
}
Sample output:
Enter a number: 5
Factorial of 5 is: 120
Code 2:
- Factorial program in c using for loop
- Simple factorial program in c
- C program to calculate factorial
#include<stdio.h>
int main(){
int i,f=1,num;
printf("Enter a number: ");
scanf("%d",&num);
for(i=1;i<=num;i++)
f=f*i;
printf("Factorial of %d is: %d",num,f);
return 0;
}
Write a c program for Floyd’s triangle.
What is Floyd’s triangle?
Definition of floyd’s triangle:
Floyd’s triangle is a right angled-triangle using the natural numbers. Examples of floyd’s triangle:
Example 1
1
2 3
4 5 6
7 8 9 10
Example 2:
1
2 3
4 5 6
7 8 9 10
11 12 13 14 15
16 17 18 19 20 21
- Write a c program to print Floyd’s triangle
- C program to display Floyd’s triangle
- How to print Floyd’s triangle in c
#include<stdio.h>
int main(){
int i,j,r,k=1;
printf("Enter the range: ");
scanf("%d",&r);
printf("FLOYD'S TRIANGLE\n\n");
for(i=1;i<=r;i++){
for(j=1;j<=i;j++,k++)
printf(" %d",k);
printf("\n");
}
return 0;
}
Sample output:
Enter the range: 10
FLOYD’S TRIANGLE
1
2 3
4 5 6
7 8 9 10
11 12 13 14 15
16 17 18 19 20 21
22 23 24 25 26 27 28
29 30 31 32 33 34 35 36
37 38 39 40 41 42 43 44 45
46 47 48 49 50 51 52 53 54 55
Write a c program to print Pascal triangle.
Sample output:
Enter the no. of lines: 8
1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
1 5 10 10 5 1
1 6 15 20 15 6 1
1 7 21 35 35 21 7 1
- Pascal triangle in c without using array
- C code to print Pascal triangle
- 3. Simple c program for Pascal triangle
- C program to generate Pascal triangle
- Pascal triangle program in c language
- C program to print Pascal triangle using for loop
#include<stdio.h>
long fact(int);
int main(){
int line,i,j;
printf("Enter the no. of lines: ");
scanf("%d",&line);
for(i=0;i<line;i++){
for(j=0;j<line-i-1;j++)
printf(" ");
for(j=0;j<=i;j++)
printf("%ld ",fact(i)/(fact(j)*fact(i-j)));
printf("\n");
}
return 0;
}
long fact(int num){
long f=1;
int i=1;
while(i<=num){
f=f*i;
i++;
}
return f;
}
TO FIND MULTIPLICATION TABLE USING C PROGRAM
- Multiplication tables in c program
- Write a c program to print multiplication table
- Code for multiplication table in c
- Multiplication table in c language
- Write a c program to print multiplication table
#include<stdio.h>
int main(){
int r,i,j,k;
printf("Enter the number range: ");
scanf("%d",&r);
for(i=1;i<=r;i++){
for(j=1;j<=10;j++)
printf("%d*%d=%d ",i,j,i*j);
printf("\n");
}
return 0;
}
Sample Output:
Enter the number range: 5
1*1=1 1*2=2 1*3=3 1*4=4 1*5=5 1*6=6 1*7=7 1*8=8 1*9=9 1*10=10
2*1=2 2*2=4 2*3=6 2*4=8 2*5=10 2*6=12 2*7=14 2*8=16 2*9=18 2*10=20
3*1=3 3*2=6 3*3=9 3*4=12 3*5=15 3*6=18 3*7=21 3*8=24 3*9=27 3*10=30
4*1=4 4*2=8 4*3=12 4*4=16 4*5=20 4*6=24 4*7=28 4*8=32 4*9=36 4*10=40
5*1=5 5*2=10 5*3=15 5*4=20 5*5=25 5*6=30 5*7=35 5*8=40 5*9=45 5*10=50
PRINTING ASCII VALUE USING C PROGRAM
Printing ascii value using c program
C code for ASCII table
C program to display ASCII values
#include<stdio.h>
int main(){
int i;
for(i=0;i<=255;i++)
printf("ASCII value of character %c: %d\n",i,i);
return 0;}
Output:
ASCII value of character : 0
ASCII value of character ☺: 1
ASCII value of character ☻: 2
ASCII value of character ♥: 3
ASCII value of character ♦: 4
ASCII value of character ♣: 5
ASCII value of character ♠: 6
ASCII value of character : 7
ASCII value of character: 8
ASCII value of character :
ASCII value of character
: 10
ASCII value of character ♂: 11
ASCII value of character ♀: 12
: 13I value of character
ASCII value of character ♫: 14
ASCII value of character ☼: 15
ASCII value of character ►: 16
ASCII value of character ◄: 17
ASCII value of character ↕: 18
ASCII value of character ‼: 19
ASCII value of character ¶: 20
ASCII value of character §: 21
ASCII value of character ▬: 22
ASCII value of character ↨: 23
ASCII value of character ↑: 24
ASCII value of character ↓: 25
ASCII value of character →: 26
ASCII value of character ←: 27
ASCII value of character ∟: 28
ASCII value of character ↔: 29
ASCII value of character ▲: 30
ASCII value of character ▼: 31
ASCII value of character : 32
ASCII value of character !: 33
ASCII value of character “: 34
ASCII value of character #: 35
ASCII value of character $: 36
ASCII value of character %: 37
ASCII value of character &: 38
ASCII value of character ‘: 39
ASCII value of character (: 40
ASCII value of character ): 41
ASCII value of character *: 42
ASCII value of character +: 43
ASCII value of character ,: 44
ASCII value of character -: 45
ASCII value of character .: 46
ASCII value of character /: 47
ASCII value of character 0: 48
ASCII value of character 1: 49
ASCII value of character 2: 50
ASCII value of character 3: 51
ASCII value of character 4: 52
ASCII value of character 5: 53
ASCII value of character 6: 54
ASCII value of character 7: 55
ASCII value of character 8: 56
ASCII value of character 9: 57
ASCII value of character :: 58
ASCII value of character ;: 59
ASCII value of character <: 60
ASCII value of character =: 61
ASCII value of character >: 62
ASCII value of character ?: 63
ASCII value of character @: 64
ASCII value of character A: 65
ASCII value of character B: 66
ASCII value of character C: 67
ASCII value of character D: 68
ASCII value of character E: 69
ASCII value of character F: 70
ASCII value of character G: 71
ASCII value of character H: 72
ASCII value of character I: 73
ASCII value of character J: 74
ASCII value of character K: 75
ASCII value of character L: 76
ASCII value of character M: 77
ASCII value of character N: 78
ASCII value of character O: 79
ASCII value of character P: 80
ASCII value of character Q: 81
ASCII value of character R: 82
ASCII value of character S: 83
ASCII value of character T: 84
ASCII value of character U: 85
ASCII value of character V: 86
ASCII value of character W: 87
ASCII value of character X: 88
ASCII value of character Y: 89
ASCII value of character Z: 90
ASCII value of character [: 91
ASCII value of character \: 92
ASCII value of character ]: 93
ASCII value of character ^: 94
ASCII value of character _: 95
ASCII value of character `: 96
ASCII value of character a: 97
ASCII value of character b: 98
ASCII value of character c: 99
ASCII value of character d: 100
ASCII value of character e: 101
ASCII value of character f: 102
ASCII value of character g: 103
ASCII value of character h: 104
ASCII value of character i: 105
ASCII value of character j: 106
ASCII value of character k: 107
ASCII value of character l: 108
ASCII value of character m: 109
ASCII value of character n: 110
ASCII value of character o: 111
ASCII value of character p: 112
ASCII value of character q: 113
ASCII value of character r: 114
ASCII value of character s: 115
ASCII value of character t: 116
ASCII value of character u: 117
ASCII value of character v: 118
ASCII value of character w: 119
ASCII value of character x: 120
ASCII value of character y: 121
ASCII value of character z: 122
ASCII value of character {: 123
ASCII value of character |: 124
ASCII value of character }: 125
ASCII value of character ~: 126
ASCII value of character ⌂: 127
ASCII value of character Ç: 128
ASCII value of character ü: 129
ASCII value of character é: 130
ASCII value of character â: 131
ASCII value of character ä: 132
ASCII value of character à: 133
ASCII value of character å: 134
ASCII value of character ç: 135
ASCII value of character ê: 136
ASCII value of character ë: 137
ASCII value of character è: 138
ASCII value of character ï: 139
ASCII value of character î: 140
ASCII value of character ì: 141
ASCII value of character Ä: 142
ASCII value of character Å: 143
ASCII value of character É: 144
ASCII value of character æ: 145
ASCII value of character Æ: 146
ASCII value of character ô: 147
ASCII value of character ö: 148
ASCII value of character ò: 149
ASCII value of character û: 150
ASCII value of character ù: 151
ASCII value of character ÿ: 152
ASCII value of character Ö: 153
ASCII value of character Ü: 154
ASCII value of character ¢: 155
ASCII value of character £: 156
ASCII value of character ¥: 157
ASCII value of character ₧: 158
ASCII value of character ƒ: 159
ASCII value of character á: 160
ASCII value of character í: 161
ASCII value of character ó: 162
ASCII value of character ú: 163
ASCII value of character ñ: 164
ASCII value of character Ñ: 165
ASCII value of character ª: 166
ASCII value of character º: 167
ASCII value of character ¿: 168
ASCII value of character ⌐: 169
ASCII value of character ¬: 170
ASCII value of character ½: 171
ASCII value of character ¼: 172
ASCII value of character ¡: 173
ASCII value of character «: 174
ASCII value of character »: 175
ASCII value of character ░: 176
ASCII value of character ▒: 177
ASCII value of character ▓: 178
ASCII value of character │: 179
ASCII value of character ┤: 180
ASCII value of character ╡: 181
ASCII value of character ╢: 182
ASCII value of character ╖: 183
ASCII value of character ╕: 184
ASCII value of character ╣: 185
ASCII value of character ║: 186
ASCII value of character ╗: 187
ASCII value of character ╝: 188
ASCII value of character ╜: 189
ASCII value of character ╛: 190
ASCII value of character ┐: 191
ASCII value of character └: 192
ASCII value of character ┴: 193
ASCII value of character ┬: 194
ASCII value of character ├: 195
ASCII value of character ─: 196
ASCII value of character ┼: 197
ASCII value of character ╞: 198
ASCII value of character ╟: 199
ASCII value of character ╚: 200
ASCII value of character ╔: 201
ASCII value of character ╩: 202
ASCII value of character ╦: 203
ASCII value of character ╠: 204
ASCII value of character ═: 205
ASCII value of character ╬: 206
ASCII value of character ╧: 207
ASCII value of character ╨: 208
ASCII value of character ╤: 209
ASCII value of character ╥: 210
ASCII value of character ╙: 211
ASCII value of character ╘: 212
ASCII value of character ╒: 213
ASCII value of character ╓: 214
ASCII value of character ╫: 215
ASCII value of character ╪: 216
ASCII value of character ┘: 217
ASCII value of character ┌: 218
ASCII value of character █: 219
ASCII value of character ▄: 220
ASCII value of character ▌: 221
ASCII value of character ▐: 222
ASCII value of character ▀: 223
ASCII value of character α: 224
ASCII value of character ß: 225
ASCII value of character Γ: 226
ASCII value of character π: 227
ASCII value of character Σ: 228
ASCII value of character σ: 229
ASCII value of character µ: 230
ASCII value of character τ: 231
ASCII value of character Φ: 232
ASCII value of character Θ: 233
ASCII value of character Ω: 234
ASCII value of character δ: 235
ASCII value of character ∞: 236
ASCII value of character φ: 237
ASCII value of character ε: 238
ASCII value of character ∩: 239
ASCII value of character ≡: 240
ASCII value of character ±: 241
ASCII value of character ≥: 242
ASCII value of character ≤: 243
ASCII value of character ⌠: 244
ASCII value of character ⌡: 245
ASCII value of character ÷: 246
ASCII value of character ≈: 247
ASCII value of character °: 248
ASCII value of character ∙: 249
ASCII value of character ·: 250
ASCII value of character √: 251
ASCII value of character ⁿ: 252
ASCII value of character ²: 253
ASCII value of character ■: 254
ASCII value of character : 255
C program to print hello world without using semicolon
#include<stdio.h>
void main(){
if(printf("Hello world")){
}
}
Solution: 2
#include<stdio.h>
void main(){
while(!printf("Hello world")){
}
}
Solution: 3
#include<stdio.h>
void main(){
switch(printf("Hello world")){
}
}
CONVERSION OF DECIMAL TO BINARY USING C PROGRAM
#include<stdio.h>
int main(){
long int m,no=0,a=1;
int n,rem;
printf("Enter any decimal number->");
scanf("%d",&n);
m=n;
while(n!=0){
rem=n%2;
no=no+rem*a;
n=n/2;
a=a*10;
}
printf("The value %ld in binary is->",m);
printf("%ld",no);
return 0;
}
C code for binary to decimal conversion:
#include<stdio.h>
int main(){
long int binaryNumber,decimalNumber=0,j=1,remainder;
printf("Enter any number any binary number: ");
scanf("%ld",&binaryNumber);
while(binaryNumber!=0){
remainder=binaryNumber%10;
decimalNumber=decimalNumber+remainder*j;
j=j*2;
binaryNumber=binaryNumber/10;
}
printf("Equivalent decimal value: %ld",decimalNumber);
return 0;
}
Sample output:
Enter any number any binary number: 1101
Equivalent decimal value: 13
Algorithm:
Binary number system: It is base 2 number system which uses the digits from 0 and 1.
Decimal number system:
It is base 10 number system which uses the digits from 0 to 9
Convert from binary to decimal algorithm:
For this we multiply each digit separately from right side by 1, 2, 4, 8, 16 … respectively then add them.
Binary number to decimal conversion with example:
For example we want to convert binary number 101111 to decimal:
Step1: 1 * 1 = 1
Step2: 1 * 2 = 2
Step3: 1 * 4 = 4
Step4: 1 * 8 = 8
Step5: 0 * 16 = 0
Step6: 1 * 32 = 32
Its decimal value: 1 + 2 + 4+ 8+ 0+ 32 = 47
That is (101111)2 = (47)10