C example

#include <stdio.h>
#include <stdlib.h>

typedef struct { float left;   float right; } ears;
typedef struct { char name[13];  int weight;  ears eararea; } monkey;    
int sort_monkey( const void *, const void *);

int main(void)
{monkey* monkeys[4];

  int i;
  char alfa[6] = { 'C', 'E', 'A', 'D', 'F', 'B' }; 
  qsort( (char*)alfa, 6, sizeof(char), sort_order);
  for (i=0 ; i<5 ; i++)  // now in order?
     printf("\nchar %d = %c",i, alfa[i]);
  printf("\n");

for(i=0;i<4;i++) {
    monkeys[i]= (monkey* )malloc(sizeof(monkey));  
    monkeys[i]->weight=i;   
}

qsort((void* ) monkeys, 4, sizeof(monkey* ), sort_monkey);
 for (i=0 ; i<4; i++)  // now in order?
     printf("\nchar %d = %i",i, monkeys[i]->weight); 
  return 0;
}

int sort_order( const void* a, const void* b)
{
  if      ( *((char*)a) < *((char*)b) )     return -1 ;
  else if ( *((char*)a) > *((char*)b) )     return  1 ;
  else                                      return  0 ;
}

// Sorted by weight    
int sort_monkey( const void* a, const void* b) {
    if((**((monkey** )a)).weight < (**((monkey** )b)).weight) return -1 ;
    else if ((**((monkey** )a)).weight > (**((monkey** )b)).weight ) return  1 ;
    else return  0 ;
}