[프로그래머스] 7의 개수_Lv.0

https://school.programmers.co.kr/learn/courses/30/lessons/120912

프로그래머스

using System;

public class Solution {
    public int solution(int[] array) {
        int answer = 0;
        for (int i=0; i<array.Length; i++)
        {
           foreach (char a in array[i].ToString())
           {
               if (a =='7')
               {
                  answer++;
               }
           }
        }
        return answer;
    }
}