题解 | #统计字符串中各类型字符的个数#

#include <cctype>
#include <iostream>
#include <cstring>
using namespace std;

int main() {

    int letter = 0;
    int digit = 0;
    int space = 0;
    int other = 0;
    
    char buf[1024] = {0};
    cin.getline(buf, sizeof(buf));

    // write your code here......
    for (int i = 0; buf[i] != '\0'; ++i)
    {
        if (isdigit(buf[i]))
            digit++;
        else if (isalpha(buf[i]))
            letter++;
        else if (isspace(buf[i]))
            space++;
        else
            other++;
    }

    cout << "letter:" << letter << " digit:" << digit << " space:" << space << " other:" << other << endl;

    return 0;
}

直接调用api