21.WAP TO CHECK WHETHER THE ENTERED NO.IS PRIME OR NOT

//WAP TO CHECK WHETHER THE ENTERED NO.IS PRIME OR NOT.

#include

#include

void main()

{

int num,b,i;

clrscr();

printf("ENTER THE NUMBER=");

scanf("%d",&num);

i=2;

while(i<=num-1)

{

if(num%i==0)

{

printf("\n\n\nENTERED NO.IS NOT A PRIME NO.");

break;

}

i++;

}

if(i==num)

printf("\n\n\nENTERED NUMBER IS A PRIME NUMBER");

getch();

}

/******OUTPUT******

ENTER THE NUMBER=3

ENTERED NUMBER IS A PRIME NUMBER

*/