题解 | #统计字符串中各类型字符的个数#

#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 (buf[i] == ' ') {
            space++;
        } else if (buf[i] >= 48 && buf[i] <= 57) {
            digit++;
        } else if (buf[i] >= 65 && buf[i] <= 90 || buf[i] >= 97 && buf[i] <= 122) {
            letter++;
        } else {
            other++;
        }
    }


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

    return 0;
}