C stdlib qsort() 函数

示例

对数组进行排序

// Comparing function:
// Returns a positive number if a is greater than b
// Returns a negative number if a is less than b
// Returns 0 if a is equal to b
int compare(const void *a, const void *b) {
  int *valA = a;
  int *valB = b;
  return *valA - *valB;
}

int main() {
  // Create an array
  int myArray[] = {20, 32, 5, 2, 24, 15};
  int size = sizeof(myArray) / sizeof(myArray[0]);

  // Sort the values in the array
  qsort (myArray, size, sizeof(myArray[0]), compare);

  // Display the values of the array
  for(int i = 0; i < size; i++) {
    printf("%d ", myArray[i]);
  }

  return 0;
}