/ * C program to find the Number is Prime or not-Prime */
#include<stdio.h>
main()
{
int n,r=1,d=2;
printf("\n Enter the Number : ");
scanf("%d",&n);
if(n==2)
{
printf("\n %d is a Prime Number \n",n);
exit(0); //to exit from program
}
r=n%d; /*we have to do this before while also becuuse
if while condition fails then r=n%d inside while is not executed*/
while(d<=n/2)
{
r=n%d;
if(r==0)
break; //if r==0, then to come out of while loop
d++; //incrementing d value if(r==0) fails..
}
if(r==0||n==1) // since 1 is not a prime number
printf("\n %d is not a Prime Number \n",n);
else
printf("\n %d is a Prime Number \n",n);
return(0);
}
Output: (using GNU GCC Compiler with Code::Blocks Compiler)
#include<stdio.h>
main()
{
int n,r=1,d=2;
printf("\n Enter the Number : ");
scanf("%d",&n);
if(n==2)
{
printf("\n %d is a Prime Number \n",n);
exit(0); //to exit from program
}
r=n%d; /*we have to do this before while also becuuse
if while condition fails then r=n%d inside while is not executed*/
while(d<=n/2)
{
r=n%d;
if(r==0)
break; //if r==0, then to come out of while loop
d++; //incrementing d value if(r==0) fails..
}
if(r==0||n==1) // since 1 is not a prime number
printf("\n %d is not a Prime Number \n",n);
else
printf("\n %d is a Prime Number \n",n);
return(0);
}
Output: (using GNU GCC Compiler with Code::Blocks Compiler)
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-Sameer