Program for checking whether input number is Prime or not


#include<stdio.h>
#include<conio.h>
void main()
{
int n,n1,i;
printf("\nEnter any positive integer number to check");
scanf("%d",&n);
if(n==1 || n==2)
printf("\nThe number is Prime");
else
{
i=2;
while(i<=n)
{
if(n%i==0)
break;
i++;
}
if(n==i)
printf("\nThe Number is Prime");
else
printf("\nThe Number is Not Prime");
}
printf("\nPress any key to continue...");
getch();
}

 Output

Enter any positive integer number to check 4

The Number is Not Prime
Press any key to continue...
Enter any positive integer number to check
7
The Number is Prime
Press any key to continue...

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