用C++中的字符串类作为形参统计从键盘输入的字符串中字母、数字、空格和其他字符数的个数

#include <stdio.h>
#include <string.h>

void countChar(char str[]) {
    int len = strlen(str);
    int letterCount = 0, digitCount = 0, spaceCount = 0, otherCount = 0;
    
    for(int i = 0; i < len; i++) {
        char c = str[i];
        if(c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z') {
            letterCount++;
        } else if(c >= '0' && c <= '9') {
            digitCount++;
        } else if(c == ' ' || c == '\t' || c == '\n') {
            spaceCount++;
        } else {
            otherCount++;
        }
    }
    
    printf("Letter count: %d\n", letterCount);
    printf("Digit count: %d\n", digitCount);
    printf("Space count: %d\n", spaceCount);
    printf("Other count: %d\n", otherCount);
}

int main() {
    char str[100];
    printf("Enter a string: ");
    fgets(str, 100, stdin);
    countChar(str);
    return 0;
}