find a element using binary search

#include main() { int i,c=0,n,a[20],first,last,mid,item; printf("Enter the size of array:"); scanf("%d",&n); for(i=0;iitem) last=mid-1; else first=mid+1; } if(c==1) printf("Item is found at=%d",mid+1); else printf("Item us not found"); }