Program Prime Numbers C Language

Hey everyone, I want to share my experience with C language. This my program will print prime numbers. You simply enter the number of primes that you want to display. And this is the source code.

#include<stdio.h>

int main(){
 int a, n, i, sum, total=0;
 printf("input how prime should print : ");
 scanf("%d",&n);
 for(a=1;total<n;a++){
  sum=0;
  for(i=1;i<=a;i++){
   if(a%i==0){
    sum++;
   }
  }
  if(sum==2){
   printf("%d ",a);
   total++;
  }
 }
}

It is a program from me, hopefully useful.