Prime numbers from 1 to 100

#include<stdio.h>
#include<conio.h>
void main()
{
void prime();
clrscr();
prime();
//printf("enter the range");
//scanf("%d",&r);
getch();
}
void prime()
{
int a,b,c=0,r;
a=1;
while(a<=100)
{
b=1;c=0;
while(b<=a)
{
if(a%b==0)
c=c+1;
b++;
}
if(c==2)
printf("\n%d in prime number ",a);
a++;
}
}