Question

Prime Numbers) Write a program to calculate and print a list of all prime numbers from 1 to 100.

C programming

Answer 1

#include <stdio.h>

int isPrime(int num)
{
   int i;
   if (num <= 1) return 0;
   if (num % 2 == 0 && num > 2) return 0;
   for (i = 3; i <= num / 2; i += 2)
   {
      if (num % i == 0)
         return 0;
   }
   return 1;
}

int main(){
   int i = 2;
   while(i<100){  
      if(isPrime(i)){       
         printf("%d\n",i);
      }
      i++;
   }
   return 0;
}