c - Divide and Conquer-Returning an array -


i'm going through divide , conquer algorithm.

i'm able solve problems if return value supposes single integer.

ex:1. binary search, here need return 1 if found, else -1.

ex:2. maximum number in array, need return single number.

but when comes returning array, when need whole array output(ex: sorting).

i feel difficult.

can best approach?

below approach binary search.

#include<stdio.h> char* divide(int arr[],int l,int r,int key) {     int m=(l+r)/2;     if(l==r)     {         if(key==arr[m])             return "found";         else             return "not found";     }     else     {         if(key==arr[m])             return "found";         else if(key>arr[m])             divide(arr,m+1,r,key);         else             divide(arr,l,m,key);     } } int main() {     int arr[]={1,2,3,4,5,6,7,8};     int n=sizeof(arr)/sizeof(arr[0]);     char* result=divide(arr,0,n-1,10);     printf("%s\n",result);     return 0; }

you have return values in recursive call try 

#include<stdio.h> char* divide(int arr[],int l,int r,int key) {     int m=(l+r)/2;     if(l==r)     {         if(key==arr[m])             return "found";         else             return "not found";     }     else     {         if(key==arr[m])             return "found";         else if(key>arr[m])             return divide(arr,m+1,r,key); // returning values here         else             return divide(arr,l,m,key); // , here make work     } } int main() {     int arr[]={1,2,3,4,5,6,7,8};     int n=sizeof(arr)/sizeof(arr[0]);     char* result=divide(arr,0,n-1,10);     printf("%s\n",result);     return 0; }

check demo @ online compiler


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