提示并输入一个字符串，统计该字符串中字母、数字、空格、其他字符的个数并输出

代码展示

#include <iostream>

using namespace std;

int main() {
    string str;
    int countc = 0; // 字母计数
    int countn = 0; // 数字计数
    int count = 0;  // 空格计数
    int counto = 0; // 其他字符计数

    cout << "请输出一个字符串:" << endl;
    getline(cin, str);
    int len = str.size();

    for (int i = 0; i < len; i++) {
        if ((str[i] >= 'A' && str[i] <= 'Z') || (str[i] >= 'a' && str[i] <= 'z')) {
            countc++;
        } else if (str[i] >= '0' && str[i] <= '9') { 
            countn++;
        } else if (str[i] == ' ') {
            count++;
        } else {
            counto++;
        }
    }

    cout << "字母：" << countc << endl;
    cout << "数字：" << countn << endl;
    cout << "空格：" << count << endl;
    cout << "其他字符：" << counto << endl;

    return 0;
}

运行结果

思维导图