check prime number or not [c programming examples with output]

C programming examples with output:

Prime or Not Prime

Program:

#include<stdio.h>

#include<conio.h>

main()

{

int a,b,c;

clrscr();

printf("Enter any number : ");

scanf("%d",&a);

b=1;

c=0;

while(b<=a)

{

if(a%b==0)

c=c+1;

b++;

}

if(c==2)

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

else

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

getch();

}

Output:

Enter any number: 2

2 is a prime number

Enter any number:4

4 is not a prime number

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