如何通过printf在C中打印字符数组?[已关闭]

发布的代码不正确: a_static 和 b_static 应定义为数组。

有两种方法可以更正代码:

• 您可以添加空终止符以使这些数组适合C字符串:

  #include <stdio.h>
  
  int main(void) {
      char a_static[] = { 'q', 'w', 'e', 'r', '\0' };
      char b_static[] = { 'a', 's', 'd', 'f', '\0' };
  
      printf("value of a_static: %s\n", a_static);
      printf("value of b_static: %s\n", b_static);
      return 0;
  }
  

• 或者, printf 可以使用精度字段打印以非null结尾的数组的内容:

  #include <stdio.h>
  
  int main(void) {
      char a_static[] = { 'q', 'w', 'e', 'r' };
      char b_static[] = { 'a', 's', 'd', 'f' };
  
      printf("value of a_static: %.4s\n", a_static);
      printf("value of b_static: %.*s\n", (int)sizeof(b_static), b_static);
      return 0;
  }
  

  在 . 指定要从字符串输出的最大字符数。它可以作为十进制数或 * 并作为 int 前的参数 char 指针。

这会导致分段错误? 因为下面的陈述

char a_static = {'q', 'w', 'e', 'r'};

a_static 应该是 char array 保存多个字符。让它像

 char a_static[] = {'q', 'w', 'e', 'r','\0'}; /* add null terminator at end of array */

类似于 b_static

char b_static[] = {'a', 's', 'd', 'f','\0'};

您需要使用数组而不是声明

a_static
b_static

作为变量

看起来是这样的:

int main()
{
  char a_static[] = {'q', 'w', 'e', 'r','\0'};
  char b_static[] = {'a', 's', 'd', 'f','\0'};
  printf("a_static=%s,b_static=%s",a_static,b_static);
  return 0;
}

例如,如果要使用字符数组打印“alien”:

char mystring[6] = { 'a' , 'l', 'i', 'e' , 'n', 0}; //see the last zero? That is what you are missing (that's why C Style String are also named null terminated strings, because they need that zero)
printf("mystring is \"%s\"",mystring);

输出应为:

mystring是“外星人”

回到您的代码,它应该如下所示:

int main(void) 
{
  char a_static[5] = {'q', 'w', 'e', 'r', 0};
  char b_static[5] = {'a', 's', 'd', 'f', 0}; 
  printf("\n value of a_static: %s", a_static); 
  printf("\n value of b_static: %s\n", b_static); 
  return 0;//return 0 means the program executed correctly
}

顺便说一下,您可以使用指针代替数组(如果不需要修改字符串):

char *string = "my string"; //note: "my string" is a string literal

此外,还可以使用字符串文字初始化字符数组:

char mystring[6] = "alien"; //the zero is put by the compiler at the end 

另外:在C样式字符串上操作的函数(例如printf、sscanf、strcmp、strcpy等)需要零才能知道字符串的结束位置

希望你从这个答案中学到一些东西。