C++ 最大随机数生成器

Question

我正在尝试为 3 个团队生成 3 个随机分数并确定哪个分数最高。我的做法是使用Predfined函数，一个程序员定义的函数，声明并定义该函数。我对此很陌生，我买的这本书并没有真正帮助我。

以下是代码端的目标大纲:

• 调用预定义函数生成随机数序列

• 声明并定义一个返回值的函数

• 调用程序员定义的函数。

最终目标(摘自书中):

• 编写一个名为 max 的函数，它接受三个 int 类型的参数并返回参数的最大值。您的程序必须同时具有此函数的声明和定义。函数声明必须放在 main 函数之上。

• 编写执行以下操作的函数 main():

  一个。生成一个介于 10 和 40 之间的随机整数作为三个团队中每个团队的分数Hoosier、Boilermakers 和 Fighting Irish，并打印出这些乐谱。你的程序必须能够在不同时间运行时生成不同的分数序列。

  调用任务 1 中定义的函数 max 来查找所有团队中的最大分数并打印出找到的最大分数。

  将最大的分数与 Hoosier 的分数进行比较，并打印出“Go Hoosier!!!”如果 Hoosier 队的得分等于所有队中得分最高的。

这是代码

/*

    Author: Dan Wingeart
    Assignment: Lab 9

*/

#include <iostream>

#include <cmath>

#include <cstdlib>

using namespace std;

int max(int Hscore, int Pscore, int Fscore);

int main()
{

    int Fscore, Pscore, Hscore, highestScore;

    Fscore = 10 + rand() % 40;
    Pscore = 10 + rand() % 40;
    Hscore = 10 + rand() % 40;

    cout << "Prediction performance of sport teams:" << endl;
    cout << "Team Hoosier's score is " << Hscore << endl;
    cout << "Team Boilermakers' score is " << Pscore << endl;
    cout << "Team Fighting Irish's score is " << Fscore << endl;

    highestScore = max(Hscore, Pscore, Fscore)

    if (max>Pscore&&max>Fscore){
        cout << "The largest score is " << max << endl;
        cout << "GO HOOSIER!!!" << endl;}
    else
        cout << "The largest score is " << max << endl;


return 0;
}

int max(int Hscore, int Pscore, int Fscore)
{

    if (Hscore>Pscore&&Hscore>Fscore){
        cout << Hscore;}

    else if (Pscore>Hscore&&Pscore>Fscore){
        cout << Pscore;}

    else{
        cout << Fscore;}

return 0;

}

产生的错误:

ClCompile:
1>  Lab9.cpp
1>c:\users\mackiller\documents\visual studio 2010\projects\lab9\lab9\lab9.cpp(34): error C2143: syntax error : missing ';' before 'if'
1>c:\users\mackiller\documents\visual studio 2010\projects\lab9\lab9\lab9.cpp(34): error C2563: mismatch in formal parameter list
1>c:\users\mackiller\documents\visual studio 2010\projects\lab9\lab9\lab9.cpp(34): error C2563: mismatch in formal parameter list
1>c:\users\mackiller\documents\visual studio 2010\projects\lab9\lab9\lab9.cpp(35): error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'overloaded-function' (or there is no acceptable conversion)
1>          c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(679): could be 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)'
1>          with
1>c:\users\mackiller\documents\visual studio 2010\projects\lab9\lab9\lab9.cpp(38): error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'overloaded-function' (or there is no acceptable conversion)
1>          c:\program files (x86)\microsoft visual studio 10.0\vc\include\ostream(679): could be 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)'
1>          with
1

Answer 1

    //don't forget to like if the solution is working
    //ask ban

    #include <iostream>
    #include <cstdlib>
    #include <time.h>
    using namespace std;

    int max(int Hscore, int Pscore, int Fscore);

    int main()
    {
        srand ( time(NULL) );//(1) 
        int Fscore, Pscore, Hscore, highestScore;

        Fscore = 10 + rand() % 40;
        Pscore = 10 + rand() % 40;
        Hscore = 10 + rand() % 40;

        cout << "Prediction performance of sport teams:" << endl;
        cout << "Team Hoosrand ( time(NULL) );sier's score is " << Hscore << endl;
        cout << "Team Boilermakers' score is " << Pscore << endl;
        cout << "Team Fighting Irish's score is " << Fscore << endl;

        highestScore = max(Hscore, Pscore, Fscore);

        cout<<highestScore;


    return 0;
    }

    int max(int a, int b, int c)
    {
        if(a>b && a>c)//we assume that a is the maximum. This means that a > b and a > c
        {
            return a;
        }
        else // if a is not maximum then we assume that b is maximum
        {
            if(b>c)
            {
                return b;
            }
        }
        return c;// if a and b are not maximum then c is maximum
    }

//(1)这个函数会帮助你在每次运行程序时得到不同的随机数，更多信息在这里:http://www.cplusplus.com/reference/cstdlib/srand/