题解 | #使用字符函数统计字符串中各类型字符的个数#

#include <cctype>
#include <iostream>
#include <string>

using namespace std;

int main() {

    string str;
    getline(cin, str);

    int whitespace = 0;
    int digits = 0;
    int chars = 0;
    int others = 0;

    // write your code here......
    int i = 0;
    while (str[i] !='\0') {
        if (isalpha(str[i])) {
            chars++;
        }
        else if (isdigit(str[i])) {
            digits++;
        }
        else if (isspace(str[i])) {
            whitespace++;
        }
        else {
            others++;
        }
        i++;
    }

    cout << "chars : " << chars
        << " whitespace : " << whitespace
        << " digits : " << digits
        << " others : " << others << endl;

    return 0;
}