#include<stdio.h>
int main()
{
/* Declaring variable for n=number, c=counter variable:holds
number of factor of 'n' */
int n,c=0, i;
// Inputting number
printf("Enter number to check whether Prime or Not:");
scanf("%d",&n);
// Checking whether number valid or not
if(n>0)
{
// Checking whether number is prime or not
for(i=1;i<=n;i++)
{
if(n%i==0)
c=c+1;
}
if(c==2)
printf("Prime Number");
else
printf("Not a Prime Number");
}
else
printf("Not a valid Number");
return 0;
}
#include<stdio.h>
int main()
{
/* Declaring variable for n=number, c=counter variable:holds
number of factor of 'n' */
int n,c, i,j;
// Inputting number
printf("Enter number till which you want to list prime number:");
scanf("%d",&n);
// Checking whether number valid or not
if(n>0)
{
printf("List of Prime Numbers:");
// Checking whether number is prime or not
for(i=1;i<=n;i++)
{
c=0;
for(j=1;j<=i;j++)
{
if(i%j==0)
c=c+1;
}
if(c==2)
printf("%d ",i);
}
}
else
printf("Not a valid Number");
return 0;
}