输入若干行字符，统计其字符数、行数和空白符（空格、回车、制表符）的个数

#include<stdio.h>
main()
{
    char chr[128]={0};
    char str[256];
    int i, rows=0;
    while(1)
    {
        gets(str);
        if (*str == 0)
            break;
        rows++;
        for (i=0; str[i]; i++)
            chr[str[i]]++;
    }
    printf("行数 %d\n", rows);
    printf("字符\t个数\n");
    for (i=0; i<128; i++)
    {
        if (chr[i] == 0)
            continue;
        if (i == 9)
            printf("%s\t%d\n", "\\t", chr[i]);
        else if (i == 10)
            printf("%s\t%d\n", "\\n", chr[i]);
        else if (i == 13)
            printf("%s\t%d\n", "\\r", chr[i]);
        else if (i == 32)
            printf("%s\t%d\n", "' '", chr[i]);
        else
            printf("%c\t%d\n", i, chr[i]);
    }
}