C ++错误C2082：重新定义形式参数'whatItem'第15行 [英] C++ Error C2082: redefinition of formal parameter 'whatItem' line 15

问题描述

我做错了什么？

What Have I Done Wrong?

#include <iostream>
#include <cstring>
#include <cstdlib>
#include <string>
#include <ctime>
using namespace std;


void chance(int whatItem){

	srand(static_cast<unsigned int>(time(0)));
	int itemChance = rand();

	int Item = (itemChance % 10) +1;
	int whatItem = Item;	//This Is the Line With The ERROR!

}



void tutorial(){
	cout<<"Welcome to the tutorial";
	cout<<"\nHere we will teach you how to play this text adventure! (OMFG, Right?!)";


}
 

int main(){
	char action [6];
	int playTutorial;
	int age;
	string name;


	

	cout<<"################################################################################";
	cout<<"#                                                                              #";
	cout<<"#                           Beast's Text Adventure                             #";
	cout<<"#                                                                              #";
	cout<<"################################################################################";

	cout<<chance;
	cout<<"\n\n\n\n";
	cout<<"Do you want to play Beast's Text Adventure tutorial?\n";
	cout<<"1) Yes\n";
    cout<<"2) No\n\n";


	cin>>playTutorial;


	if (playTutorial == 1){


		tutorial();
	}else{system("CLS");



	cout<<"################################################################################";
	cout<<"#                                                                              #";
	cout<<"#                           Beast's Text Adventure                             #";
	cout<<"#                                                                              #";
	cout<<"################################################################################";
	/*Story One
	Will Be Deleted (Quick Note To Myself */

	cout<<"\n\nYou are in a dark room, you cant see anything except some light shining from \nsome doors.\nThere is two doors. One to the north. One to the south.";
    cout<<"\n\nWhich way do you want to go ";
		 cin>>action;


	//First room north
	  if ( std::strcmp( action, "north" ) == 0 ){
		  cout<<"\nIt leads to another room. This room is lighter then the last. You can make out alightswitch to the left of you.";
		  cout<<"\n\nWhat do you want to do ";
		  cin>>action;
		

		//First room south
	  }else if ( std::strcmp( action, "south" ) == 0 ){
		  cout<<"\nThis room looks the same as the last except there some light breaking through\nsome red velvet curtains.\n";
	  }
	}
		system("pause");
	return 0;
}

推荐答案

在你的代码中，你有：

In your code, you have:

cout << chance;

您应该将该行更改为：

You should change that line to:

cout << chance();

并重新编写没有参数的函数，并返回随机值：

and re-write your function without an argument, and return the random value:

int chance()
{
    srand(static_cast<unsigned int>(time(0)));
    int itemChance = rand();
    
    return (itemChance % 10) + 1;
}

在C和C ++中，参数按值传递，除非您将它们声明为参考参数，这些参数仅适用于C ++。因此

In C and C++ parameters are passed by value, except you declare them as reference parameters, which only works in C++. Hence

void chance(int whatItem){
 
	srand(static_cast<unsigned int="">(time(0)));
	int itemChance = rand();
 
	int Item = (itemChance % 10) +1;
	int whatItem = Item;	//This Is the Line With The ERROR!

}</unsigned>

whatItem是一个传递给函数但不能传回值的值参数。除了这个致命的错误之外，你在你的函数中重新声明了whatItem，这是不允许的。



将你的函数更改为：

whatItem is a value parameter that is passed into the function, but which cannot transfer a value back. On top of this fatal mistake you are re-declaring whatItem inside your function, which is not allowed.

Change your function to:

void chance (int& whatItem)
{
	srand(static_cast<unsigned int="">(time(0)));
	int itemChance = rand();
 
	int Item = (itemChance % 10) +1;
	whatItem = Item;
}
</unsigned>

，事情将按照您的预期运行。

and things will run the way you intended.

什么是

cout<<的输出神秘（6,2,5）<< endl;

假设以下函数定义为mystery？

int mystery（int x，int y，int z）

{

int value = x;

if（y> value）

value = y;

if（z>价值）

value = z;

返回值;

} //结束函数之谜

What is the output of
cout << mystery ( 6, 2, 5 ) << endl;
assuming the following function definition of mystery?
int mystery( int x, int y, int z )
{
int value = x;
if ( y > value )
value = y;
if ( z > value )
value = z;
return value;
} // end function mystery

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