试图读取与scanf的号码时，程序崩溃 [英] Program crashes when trying to read numbers with scanf

问题描述

出现这样的消息，当我运行该code。
Project.exe已停止工作。

A message like this appears, when i run this code. Project.exe has stopped working

我的一些其他code的作品，但这似乎把我的错误。

Some of my other code works, but this seems to throw me an error.

#include<stdio.h>
#include<conio.h>

void main()
{
    int n1, n2, sum;

    puts("first number");
    scanf("%d", n1);
    fflush(stdin);
    puts("second number");
    scanf("%d", n2);
    sum = n1 + n2;

    printf("%d + %d = %d", n1, n2, sum);

    getch();

}

我基本上要添加两个数字。

I basically want to add two numbers.

推荐答案

scanf函数发生在其存储输入值的变量的地址。你需要改变你的 scanf函数来电

scanf takes the address of the variable in which it stores the input value. You need to change your scanf calls to

scanf("%d", &n1);
scanf("%d", &n2);
//          ^ note the & operator

另外请注意，这是不确定的行为叫 fflush 上的输入流。因此， fflush（标准输入）是不正确的。您需要手动读取并丢弃标准输入流中遗留下来的多余输入。

Also, note that it's undefined behaviour to call fflush on an input stream. So, fflush(stdin) is not correct. You need to manually read and discard extraneous input left over in the stdin stream.

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