C Program to Check Number is prime or Not prime

                                      C Program 

1] C Program to Check Number is prime or Not prime

Examples :-

#include<stdio.h>

#include<conio.h>

void main()

{

int a, i, flag=0;

printf("enter a positive integer");

scanf("%d", &a);

if(a==0||a==1)

flag=1;

for(i=2;i<=a/2;i++)

{

if(a%i==0)

{

flag =1;

break;

}

}

if (flag==0)

printf("%d is prime number ", a);

else

printf("%d is not prime number",a);

getch();

return 0;

}

C Program to Check Number is prime or Not prime

Output 

 enter a positive integer 133
   133 is not prime number

C Program to Check Number is prime or Not prime

Output 

 enter a positive integer 61
  61 prime number

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