A c program to find a prime numbers for a given range

#include<stdio.h>
void main()
{
int i,n1,n2;
printf("\nEnter the range\n");
scanf("%d%d",&n1,&n2);
for(i=n1;i<=n2;i++)
{
if(isprime(i))
printf("%d",i);
}
getch();
clrscr();
}
int isprime(int m)
{
int i;
for(i=2;i<=m/2;i++)
{
if(m%i==0)
{
retuen 0;
}
}
return 1;
}