题解 | #使用字符函数统计字符串中各类型字符的个数#

#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((str[i]>='a' && str[i]<='z') || (str[i]>='A' && str[i]<='Z')){
            chars++;
        }
        else if(str[i]>='0' && str[i]<='9'){
            digits++;
        }
        else if(str[i] ==' '){
            whitespace++;
        }
        else {
            others++;
        }
        i++;
    }

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

    return 0;
}