在C中输入IP地址 [英] IP address input in C

问题描述

我想在C中编写一个程序，它从用户那里获取输入IP地址，然后我想对它进行一些位操作。我怎么能用C中的位输入。我尝试了下面的代码，但整数大小为2字节，这使得这里的完整地址为8字节（64位）。使用char扫描输入时，会丢失输入的值。有没有办法以位为单位输入（我想要32位仅32位IPv4地址和128位仅128位V6）。

  unsigned short int a，b，c，d; 
 scanf（％d。％d。％d。％d，& a，& b，& c，& d）; 
 printf（％d \ t％d \ t％d \ t％d \ t，a，b，c，d）; 
  

提前致谢。

解决方案

  #include< stdio.h> 
 
 int main（void）
 {
 unsigned char a，b，c，d; 
 scanf（％hhu。％hhu。％hhu。％hhu，& a，& b，& c，& d）; 
 printf（％hhu \t％hhu \t％hhu \ t％hhu \ t，a，b，c，d）; 
返回0; 
} 
  

给出

  $ gcc tc&& ./a.out<<< 12.12.12.12 
 12 12 12 12 
  

例如参见此参考，根据目标变量的类型（文档中的第3个表）查找要使用的说明符。 / p>

I want to write a program in C which is taking input IP Address from user and then i want to do some bit operations on it. How can i take input in bits in C. I tried the below code but integer is of size 2 bytes, which makes the complete address here of 8 bytes(64 bits). When using char to scan input, its losing the value entered. Is there any way to take input in bits( i want 32 bits IPv4 address in 32 bits only and 128bit V6 in 128 bits only).

    unsigned short int a,b,c,d;
scanf("%d.%d.%d.%d", &a,&b,&c,&d);
printf("%d\t%d\t%d\t%d\t", a, b, c, d);

Thanks in advance.

解决方案

#include <stdio.h>

int main(void)
{
      unsigned char a,b,c,d;
      scanf("%hhu.%hhu.%hhu.%hhu", &a,&b,&c,&d);
      printf("%hhu\t%hhu\t%hhu\t%hhu\t", a, b, c, d);
      return 0;
}

gives

$ gcc t.c && ./a.out <<< 12.12.12.12
12  12  12  12

See for instance this reference to find which specifier to use depending on the type of the target variables (3rd table in the document).

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