将来自键盘的 2 个输入与 strcmp 进行比较会导致段错误

Question

我是c语言的新学生，我只是想出了这个。我代码:

#include <stdio.h>
#include <string.h>

int main(void)
{
   char str[80];

   printf("Enter sth: ");
   char st1 = gets(str);

   printf("Enter sth: ");
   char st2 = gets(str);

   if(strcpy(st1,st2))
     printf("Same\n");
   else
      printf("Different\n");

  return 0;
}

我的目标是检查我从键盘输入的 2 个字符串是否相同。我编译它并收到一些警告:

hello.c: In function ‘main’: hello.c:9:16: warning: initialization makes integer from pointer without a cast [enabled by default]

hello.c:12:16: warning: initialization makes integer from pointer without a cast [enabled by default]

hello.c:14:5: warning: passing argument 1 of ‘strcpy’ makes pointer from integer without a cast [enabled by default]

/usr/include/string.h:128:14: note: expected ‘char * restrict’ but argument is of type ‘char’

hello.c:14:5: warning: passing argument 2 of ‘strcpy’ makes pointer from integer without a cast [enabled by default]

/usr/include/string.h:128:14: note: expected ‘const char * restrict’ but argument is of type ‘char’

输入某物: asd
输入某物: asd
输出:段错误(核心已转储)

Segmentation Fault 当你想访问它不存在的东西时，我看到这是一个错误!

我在 Stackoverflow 中搜索了一些类似的问题和 here但我不明白为什么这段代码不起作用。谢谢!

Answer 1

您正在将 char 变量的地址视为字符串并使用 strcpy 而不是 strcmp。这:

char st1 = gets(str);
char st2 = gets(str);
if(strcpy(st1,st2))

本来是:

char st1[255], st2[255];
scanf("%254s", st1);
scanf("%254s", st2);
if(strcmp(st1, st2) == 0)