这就是密码我以为会成功。它应该让我输入input，然后告诉我空格，数字，字母和其他的数量。但它只是提供输入，而不是给我输出。

#include <stdio.h>

int main(void)
{
    int blanks = 0, digits = 0, letters = 0, others = 0;
    char c;

    printf("Im working");

    while ((c = scanf("%c", &c)) != EOF)
    {
        if (c == ' ')
            ++blanks;
        else if (c >= '0' && c <= '9')
            ++digits;
        else if (c >= 'a' && c <= 'z')
            ++letters;  
        else if (c >= 'A' && c <= 'Z')
            ++letters;
        else
            ++others;
    };

    printf("blanks = %d, digits = %d, letters = %d, others = %d\n\n",
           blanks, digits, letters, others);
    return 0;      
}

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