c++ - arrays not being assigned properly -

void sort(int* a,int l) {     int j;     int b[l];     for(int i=0;i<l;i++)     {         j = largest(a,l);         b[l-i-1] = a[j];         a[j] = -1;     }     = b;  }   int main()   {    .    int c[3] = {x,y,z};    ...     sort(c,3);      cout<<c[0]<<c[1];     }  

output coming -1-1 if assign a[0] = b[0] , on, getting right answer. ps: i've tried using *a = *b, giving first element correct.

when assign a = b, re-assign local variable holds pointer first element of array. assignment not change in main. in particular, contents of a not affected.

you must copy elements b a after have finished sorting:

void sort(int *a, int l) {     int j;     int b[l];      // sort temporary array b         (int = 0; < l; i++) {         j = largest(a, l);         b[l - - 1] = a[j];         a[j] = -1;     }      // copy temporary array b result array     (int = 0; < l; i++) a[i] = b[i]; } 

but if @ it, amol bavannavar right: don't have check whole array largest element each time. enough check remaining elements. instead of assigning low value "used" elements, swap largest elements end. when that, you'll see processed elements @ end, unprocessed elements @ beginning. can sorting in place without need of temporary array:

void sort2(int *a, int l) {     while (l) {         int j = largest(a, l--);         int swap = a[j]; a[j] = a[l]; a[l] = swap;     } }