Write a C Program to check if the number is prime number or not

Write a program in the C programming language to check if the inputted number is a prime number or not. In this program for loop is used to create numbers from 2 to n-1 to check if they are divisible by n or not and if any of them is divisible then the control is transferred outside the for loop by using the break statement and the result is printed in negative. Below is the code of the program –

/* C Program to check if number is prime number or not */

#include<stdio.h>
void main()
{
     int n,i,ct=0,rd=0;

     printf("Enter any number \n");
     scanf("%d",&n);

     for(i=2;i<n;i++)
     {
             rd=n%i;
             if(rd==0)
             {
                     ct=1;
                     break;
             }
     }

     if(ct==0)
     {
            printf("\n %d is prime number",n);
     }
     else
     {
            printf("\n %d is not prime number",n);
     }

     getch();
}

Input – 23
Output – 23 is a prime number

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17 thoughts on “Write a C Program to check if the number is prime number or not

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