Prime Numbers in C

#include<stdio.h>
#include<conio.h>
void main()
{
int num2,num1,c,i;
clrscr();
printf("enter the starting number =");
scanf("%d",&num1);

printf("\n\nenter the ending number =");
scanf("%d",&num2);

for(i=num1;i<=num2;i++)
{
for(c=2;c<=i-1;c++)
{
if(i%c==0)
break;
}
if(i==c)
{
printf("\n\n%d",i);
}
}

 getch();
 }