C++ If语句错误: expected ';' before '{' token

Question

我写这个是为了好玩:

#include <iostream>
#include <cstdlib>
using namespace std;

int Arsenal = rand()%3;
int Norwich = rand()%3;

int main () {
  if (Arsenal > Norwich) {
    cout << "Arsenal win the three points, they are in the Top Four";
    return 0;
  } else if (Arsenal == Norwich) {
    cout << "The game was a draw, both teams gained a point";
    return 0;
  } else (Norwich > Arsenal) {
      cout << "Norwich won, Arsenal lost";
      return 0;
    }
}

我试图用 g++ 编译它，但我得到了这个错误:

arsenalNorwich.cpp: In function, 'int main'
arsenalNorwich.cpp:15:30: error: expected ';' before '{' token

我不知道我做错了什么，我学校的 CS 导师也不知道。虽然这只是为了好玩，但它让我发疯。

Answer 1

你在这里错过了一个if:

  else if (Norwich > Arsenal)
  ///^^^if missing

同时，也不好放

 int Arsenal = rand()%3;
 int Norwich = rand()%3;

在 main 之前。还有一点就是在调用rand()之前应该先设置随机种子。

你的if-else可以简化如下:

if (Arsenal > Norwich) {
   cout << "Arsenal win the three points, they are in the Top Four";
} else if (Arsenal == Norwich) {
   cout << "The game was a draw, both teams gained a point";
} else { //^^^no need to compare values again since it must be Norwich > Arsenal
         //when execution reaches this point
   cout << "Norwich won, Arsenal lost";
}
return 0;