C语言学习-12

#include<stdio.h>

int main(void)
{
    char c; 
    int letters = 0, space = 0, digit = 0, others = 0; 
    while ((c=getchar()) != ‘\n‘) 
    { 
        if (c>=‘a‘&&c<=‘z‘ || c>=‘A‘&&c<=‘Z‘)
        {
            letters++;
        }  
        else if (c==‘ ‘)
        {
            space++;
        } 
        else if (c>=‘0‘ && c<=‘9‘)
        {
            digit++;
        }  
        else
        {
            others++;
        } 
    } 
    printf("char=%d space=%d digit=%d others=%d\n", letters, space, digit, others);
    return 0;
}