Question

我在学校使用Rock Paper Scissors游戏时遇到了麻烦，我不断收到错误，我不知道如何处理它们。到目前为止，这是我的代码。

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <cctype>
#include <iostream>
using namespace std;

void playGame(int& pscore, int& cscore);
void getPlayerTurn (char selection);
int doComputerTurn (int comp);
void showOutcome (int result, int pturn, int cturn);

int main() {
    int pscore = 0;
    int cscore = 0;
    char answer;
    srand(time(0));
    cout << "*** Welcome to RPS ***" << endl;
    cout << endl;
    do {
            playGame(pscore, cscore);
            cout << "Play again? ";
            cin >> answer;
    } while(tolower(answer) == 'y');
            cout << "*** Thanks for playing ***" << endl;
}


void playGame(int& pscore, int& cscore) {

    int pturn = getPlayerTurn(int selection);
    int cturn = doComputerTurn(int comp);
     showOutcome(pscore, cscore, pturn);
    cout << "Player    : " << pscore << endl;
    cout << "Computer  : " << cscore << endl;
}

void getPlayerTurn(char selection) {
    cout << "Select (R)ock, (P)aper or (S)cissors: ";
    cin >> char selection;
    tolower(selection);
    char r = 1;
    char p = 2;
    char s = 3;
    return;
}

int doComputerTurn(int comp) {
     comp = rand() % 3 +1;
    if (comp == 1){
            cout << "Computer selects Rock." << endl;
            return(1);}
    else if (comp == 2){
            cout << "Computer selects Paper." << endl;
            return(2);}
    else{
            cout << "Computer selects Scissors." << endl;
            return(3);}
}

void showOutcome (int& pscore, int& cscore, int comp, int selection) {
    if(selection==1){
            if(comp==1){
                    cout << "Tie!" << endl;
                    }
            else if(comp==2){
                    cout << "Paper beats Rock. Computer Wins!" << endl;
                    cscore =+ 1;
                     }
            else {
                    cout << "Rock beats Scissors. Player Wins!" << endl;
                    pscore =+ 1;
                     }
                     }
    if(selection==2){
            if(comp==1){
                    cout << "Paper beats Rock. Player Wins!" << endl;
                    pscore =+ 1;
                     }
            else if(comp==2){
                    cout << "Tie!" << endl;
                    }
            else {
                    cout << "Scissors beats Paper. Computer Wins!" << endl;
                    cscore =+ 1;
                     }
                    }
    if(selection==3){
            if(comp==1){
                    cout << "Rock beats Paper. Computer Wins!" << endl;
                    cscore =+ 1;
                    }
            else if(comp==2){
                    cout << "Scissors beats Paper. Player Wins!" << endl;
                    pscore =+ 1;
                    }
            else {
                    cout << "Tie!" << endl;
                     }
}
}

我不断收到错误，例如

rps.cpp: In function 'void playGame(int&, int&)':
rps.cpp:33:28: error: expected primary-expression before 'int'
int pturn = getPlayerTurn(int selection);
                        ^
rps.cpp:34:29: error: expected primary-expression before 'int'
int cturn = doComputerTurn(int comp);

任何帮助都会很棒！

Answer 1

在C和C ++中，函数声明如下：

void getPlayerTurn(int selection) {
    // Some code
}

第一部分指定'返回类型'（在本例中为void，表示它不返回任何内容）。下一部分是函数名称，后跟参数列表。

在定义中，您必须指明参数的类型，因此在上面的代码段中int selection表示参数selection是int - 一个整数。

要调用该函数，您不需要声明参数类型，因为编译器已经知道它是什么。所以就像这样打电话

getPlayerTurn(someVariable);

岩纸剪刀错误

1 个答案: