#include<stdio.h>
main()
{
int n, c = 2;
printf("Enter a number to check if it is prime\n");
scanf("%d",&n);
for ( c = 2 ; c <= n - 1 ; c++ )
{
if ( n%c == 0 )
{
printf("%d is not prime.\n", n);
break;
}
}
if ( c == n )
printf("%d is prime.\n", n);
return 0;
}
C program for prime number using function
#include<stdio.h>
int check_prime(int);
main()
{
int n, result;
printf("Enter an integer to check whether it is prime or not.\n");
scanf("%d",&n);
result = check_prime(n);
if ( result == 1 )
printf("%d is prime.\n", n);
else
printf("%d is not prime.\n", n);
return 0;
}
int check_prime(int a)
{
int c;
for ( c = 2 ; c <= a - 1 ; c++ )
{
if ( a%c == 0 )
return 0;
}
if ( c == a )
return 1;
}
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