Scanf_s不断返回\\ 0,而不是输入 [英] Scanf_s keeps returning \0 instead of input
问题描述
我已经成为停留在一,在我心里,pretty简单的任务。我写了选取一个随机数的程序,而且让你猜是,如果输入字符'n'或'N'末退出方案,其中之一。
在code是如下:
I've become stuck on a, in my mind, pretty simple task. I have written a program that picks a random number, and makes you guess which one it is and exit the program at the end if the characters 'n' or 'N' is entered. The code is as follows:
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int input_switcher(int input, int answer)
{
if (input == answer) {return 1;}
else if(input < answer) {return 2;}
else if(input > answer) {return 3;}
else {return 0;}
}
int main(void)
{
int input, answer, tries;
char keepGoing = 'J';
srand((int)time(0));
while(42)
{
input = 0, tries = 0;
answer = 1;//rand()%100+1;
printf("Jag \"t\x84nker\" p\x86 ett tal mellan 1 och 100, gissa vilket!\n");
while(42)
{
printf("Gissning: ");
scanf_s("%d", &input);
switch (input_switcher(input, answer))
{
case 1:
printf("Grattis, det var r\x84tt!\n");
printf("Du gjorde %d f\x94rs\x94k.", tries);
break;
case 2:
printf("Du gissade f\x94r l\x86gt, f\x94rs\x94k igen!\n");
tries++;
break;
case 3:
printf("Du gissade f\x94r h\x94gt, f\x94rs\x94k igen!\n");
tries++;
break;
default:
break;
}
if(input == answer) {break;}
}
printf("Ska vi spela en g\x86ng till(J/N)? ");
scanf_s("%*c%c", &keepGoing);
if(keepGoing == 'N' || keepGoing == 'n') {return 0;}
else if(keepGoing == 'J' || keepGoing == 'j') {system("cls");}
}
return 0;
}
我遇到的问题是,我的最后一个 scanf_s
给我 \\ 0
而不是我输入字符。我已经发现的问题还是我错了?我可以更改为解决这个问题?
The problem I'm having is that my last scanf_s
gives me \0
instead of the character i enter. Have I identified the problem or am I wrong? What can I change to remedy this problem?
推荐答案
您最近 scanf_s
接收 \\ n
和没有 \\ 0
。吃了这个 \\ n
更改
Your last scanf_s
receives \n
and not \0
. To eat up this \n
change
printf("Ska vi spela en g\x86ng till(J/N)? ");
scanf_s("%*c%c", &keepGoing);
到
printf("Ska vi spela en g\x86ng till(J/N)? ");
scanf_s(" %c", &keepGoing);
^
|
space before %c specifier
这是工作。结果
输出:Win7上使用GCC 4.7.1
It is working.
Output: On Win7 with GCC 4.7.1
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