计算空格，制表符和换行符的程序

#include <stdio.h>

int main(voID){
    int c, bl, tl, nl;
    bl = 0;
    tl = 0;
    nl = 0;

    printf("input some characters, then press Ctrl+D.\n");
    while ((c = getchar()) != EOF){
        if (c == ' ')
            ++bl;
        else if (c == '\t')
            ++tl;
        else if (c == '\n')
            ++nl;
}
    printf("Count of blanks is %d, count of tabs is %d, count of newlines is %d.\n", bl, tl, nl);

    return 0;
}