카타 8급 Get the mean of an array

1 C

#include <stddef.h>
int get_average(const int *marks, size_t count) {
  int sum = 0;
  for(int i=0; i<count; i++) sum += marks[i];
  return sum / count;
}

2 C++

int summation(int num){
 return num*(num+1)/2;
}

int summation(int num){
  int sum = 0;
  for(int i=1; i<=num; i++) sum+=i;
  return sum;
}

3 PHP

function get_average($a) {
  return floor(array_sum($a)/count($a));
}

function get_average( array $a ) : int {
    return intval( array_sum( $a )/count( $a ) );
}

function get_average($a) {
  return (integer) (array_sum($a)/count($a));
}

function get_average(array $a): int {
  return array_sum($a) / count($a);
}