Prime Number

#include(stdio.h)
#include(conio.h)
void main()
{
int x,y,z;
printf("\nEnter a number");
scanf("%d",&x);
if(x<=100)
{
z=0;
y=2;
while(y<=x/2)
{
if(x%y==0)
{ z=1;
}
y++;
}
if(z==0)
{
printf("prime no");
}
else
{
printf("not a prime no");
}
}
else
{
printf("x is geter than 100");
}
}