Generating all prime numbers b/w 1 and n program in c

#include<stdio.h>

void main()
{
int n,i,f,j;

printf("enter the number to print prime numbers upto");

scanf("%d".&n);

printf("Prime number are \n ");

for(i=0;i<=n;i++)

{

f=0;

for(j=1;j<=n;j++)

{

if(i%j==0)

f++;

}

if(f==2)

printf("%d",i);

}
}


OUTPUT:

 enter the number to print prime numbers upto 10

Prime number are
2
3
5
7