c语言while循环编写统计字符串中英文字母、空格、数字和其他字母个数

#include <stdio.h>

int main()
{
    char str[100];
    int i = 0, letters = 0, spaces = 0, digits = 0, others = 0;
    
    printf("请输入字符串：");
    gets(str);
    
    while(str[i] != '\0')
    {
        if((str[i] >= 'a' && str[i] <= 'z') || (str[i] >= 'A' && str[i] <= 'Z'))
        {
            letters++;
        }
        else if(str[i] == ' ')
        {
            spaces++;
        }
        else if(str[i] >= '0' && str[i] <= '9')
        {
            digits++;
        }
        else
        {
            others++;
        }
        
        i++;
    }
    
    printf("字母个数：%d\n空格个数：%d\n数字个数：%d\n其他字符个数：%d\n", letters, spaces, digits, others);
    
    return 0;
}