Binary search

Question

I wrote this C program for binary search but it is showing runtime error:-
#include<stdio.h>
int binary(int a[],int i,int n,int x)
{
if(n<1)
return -1;
int m = i + (n-i)/2;
int l = n;
if(a[m]==x)
return m;
if(a[m]>x)
return binary(a,m+1,n,x);
if(a[m]<x)
return binary(a,i,m-1,x);

}
int main()
{
int a[10],x,i;
printf("Enter sorted array: ");
for(i=0;i<10;i++)
scanf("%d",&a[i]);
printf("Enter number to be searched: ");
scanf("%d",&x);
int n = sizeof(a)/sizeof(a[0]);
int b = binary(a,0,n-1,x);
if(b!=-1)
printf("Number is at %d position.",b);
else
printf("Number not found.");
return 0;
}

please help me