Program to find a number is prime or not

/*Program to find a number is  prime or not*/

#include "stdio.h"

#include "conio.h"

void main()

{

int a,b,c=1;

clrscr();

printf("enter the number : ");

scanf("%d",&a);

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

{

if(a%b==0)

{

c++;

}

}

if(c>1)

{

printf("not prime");

}

else

{

printf("prime ");

}

getch();

}

OUTPUT : -

enter the number : 17

prime

enter the number : 15

not prime

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