忽略“否定扫描集”的输入字符。规范，存入数据缓冲区，用C编程？ [英] Do ignored input characters for "negated scanset" specification, get stored in data buffer, while programming in C ?

问题描述

 #include< stdio.h> 
 main（）
 {
  char  name [ 15 ]，年龄[ 3 ]; 
 printf（ 请输入你的名字：\ n）; 
 scanf（ ％[^ $]，& name）; 
 printf（ 您的名字是％s。\ n，名称）; 
 printf（ 请输入您的年龄：\ n）; 
 scanf（ ％s，& age）; 
 printf（ 您的年龄是％s \ n，年龄）; 
 getch（）; 
} 

输入：

Shubham $$

输出：

您的名字是Shubham。

请输入您的年龄：

您的年龄是$$



从输出中可以清楚地看到，即使被拒绝的无效字符（即$）未显示在输出中，但它们已经存储到数据缓冲区中，因此的下一个输入年龄是缓冲区中剩余的数据，即$$。

我的问题：我想确认在每种情况下都会出现这种情况。是否，被拒绝的字符总是如此存储到数据缓冲区？



我尝试过：



我已经在2-3个程序中尝试了它但是我想知道这是否总是如此？

每次我们使用否定扫描集时，被拒绝的字符都存储在缓冲区中。

解决方案

，& name）;
printf（ < span class =code-strin g>你的名字是％s。\ n，名字）;
printf（ 请输入您的年龄：\ n）;
scanf（ ％s，& age）;
printf（ 您的年龄是％s \ n，年龄）;
getch（）;
}

输入：

Shubham

输出：

您的名字是Shubham。

请输入您的年龄：

您的年龄是

从输出中可以看出，即使被拒绝的无效字符（即

#include<stdio.h>
main()
{
 char name[15],age[3];
 printf("Please enter your name :\n");
 scanf("%[^$]",&name);
 printf("Your name is %s.\n",name);
 printf("Please enter your age :\n");
 scanf("%s",&age);
 printf("Your age is %s\n",age);
 getch();
}

Input :
Shubham$$
Output :
Your name is Shubham.
Please enter your age :
Your age is $$

From the output, it is clear that even though the rejected invalid character(i.e.,$) is not shown in the output, but they have been stored to the data buffer, so the next input for age is the data left in buffer i.e.,$$.
My Question : I want to confirm that is this behaviour expected in every case.i.e., Does the rejected characters always get stored to the data buffer ?

What I have tried:

I have tried it in 2-3 programs but i want to know whether is this always the case ?
That the rejected characters are stored in the buffer every time we use negated scanset.

解决方案

",&name); printf("Your name is %s.\n",name); printf("Please enter your age :\n"); scanf("%s",&age); printf("Your age is %s\n",age); getch(); }

Input :
Shubham

Output :
Your name is Shubham.
Please enter your age :
Your age is

From the output, it is clear that even though the rejected invalid character(i.e.,

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