C语言函数错误

Question

#include <stdio.h>
#include <windows.h>

#define java2 "5"
#define java3 "five"
#define java4 "Five"
#define java5 "FIVE"

 main(void)
 {
printf("Few question to cheer you up \n\n\n");
printf("How many class are there in Java\n");
scanf("%s",class);

if(class==java2 || class==java3 || class==java4 || class==java5 ){
     goto Okay;
}

else{
    printf("incorrect answer \n\n");
}

system("pause");
exit(0);

Okay:
{
printf("Welcome");
system("pause");
}

  return 0;
}

当我正确回答问题时，它会打印错误答案并退出如果我用这个来代替；

if(class=5 || class=five || class=Five || class==FIVE ){
goto Okay;
}

它将打印编译器错误“[error] FIVE undeclared(first use in this function)”

请帮帮我，我上周才开始写 C 语言。

Answer 1

您已定义

#define java5 "FIVE"

换句话说，您已将其定义为字符串。但为了比较字符串，您需要使用 strcmp() 而不是 ==，例如

if ( (strcmp(class, java5) == 0) || (strcmp(class, java4) == 0) ||... ){
    ....
}