C和指针 练习 1-3

#include <stdio.h>
#include <stdlib.h>

int main(void)
{
    int c;
    signed char checksum = -1;
    printf("请输入\n");
    while((c = getchar()) != '\n')
    {
        checksum += c;
        putchar(c);
    }
    printf("\n%d\n", checksum);
    return 0;
}