题解 | #计算某字母出现次数#

从头开始遍历

找到数入字母对应的大小写，则加一；否则，遍历下一个字符

#include<iostream>
#include<string>
using namespace std;
int main()
{
    string str;
    int len, flag = 0;
    getline(cin, str);
    char c;
    c = getchar();
    len = str.size();
    for (int i = 0; i < len; i++)
    {
        if (c == str[i] || c == str[i] - 32 || c == str[i] + 32)
            flag++;
        continue;
    }
    cout << flag << endl;
    return 0;
}