c - C 中带有 If 语句的指针

Question

我正在用 C 编写一个基于文本的游戏。在程序开始时，它会提示您是要开始还是结束游戏。但是，当我键入 end 或 start 时，会出现“Segmentation Fault”错误。这是我的代码:

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

//Variables
char *name, *answer ;

//Beginning of program
int main()
{
//Game starts and prompts you
printf ("--|| YOUR_ADVENTURE_HERE ||-- \n") ;
printf (" \n") ;
printf ("Type 'START' to start the game or 'END' to end the game. You can end the game at any point by typing it as well.") ;
scanf ("%59s, answer") ;

//If typed 'START'
if (answer = "START")
{
printf ("\n") ;
printf ("Starting game...") ;
sleep (5) ;

return 0 ;
}

//If they typed 'END' (this will be used in every scanf)
if (answer = "END")
{
system("exit") ;

return 0 ;  
}   

这也是我运行它时的样子:

--|| YOUR_ADVENTURE_HERE ||-- 

Type 'START' to start the game or 'END' to end the game. You can end the game at any point by typing it as well.START
Segmentation fault

提前致谢!

Answer 1

在尝试在其中存储任何内容之前，先将内存分配给指针。

scanf("%59s, answer") ;

之前应该为answer

分配内存

answer = malloc(60);
scanf ("%59s", answer) ;

另外，在旁注中，使用strcmp 来比较字符串。

if (answer = "START")

应该是

if (!strcmp(answer,"START"))