rand() 在循环中重复数字

Question

我做了一个简单的书籍制作程序，我一直在尝试在 MAIN 函数中使用循环，在 generateNumbers() 函数中使用 rand() 将随机数分配给变量“genNum”，然后传递 'genNum ' 将值传递给 MAIN 中的三个局部变量，然后传递给我的 BOOKIE 类中的成员函数。函数循环的前两次生成随机数就好了，但第三次循环生成的数字与第二次循环生成的数字相同。我浏览了有关 rand() 的所有线程，但没有一个回答我的问题。代码如下：

这是主函数

int main()
{
    bool genNumber = false;

    int genCount = 0;
    double genNum;
    double genNum1; double genNum2; double genNum3;
    Bookie bookKeeper;
    srand(time(0));
    bookKeeper.welcomeMessage();

    clientEntry();
    bookKeeper.clientList(firstClient, secondClient, thirdClient);
    while(genNumber == false) {
    generateNumbers(genNum);//This is where the numbers are generated
    genCount++;
    if(genCount == 1) {
        genNum1 = genNum;
    }
    if(genCount == 2) {
        genNum2 = genNum;
    }
    if(genCount == 3) {
        genNum3 = genNum;
        bookKeeper.clientStatus(genNum1, genNum2, genNum3);
        genNumber = true;
      }
   }

  return 0;
}

这是生成随机数的函数：

void generateNumbers(double & number) {
number = 1 + rand() % 500;
}

这是接收随机生成值的成员函数：

void Bookie::clientStatus(double num1, double num2, double num3) {
clientAOwes = num1; clientBOwes = num2; clientCOwes = num3;
string answer;

    enum Status{PAID, LATE};
Status clientAStat;
Status clientBStat;
Status clientCStat;

bool cStatus = false;
while(cStatus == false){
    cout<<clientA <<" owes " <<clientAOwes <<".\n"
        <<"Has this client paid, (Y)es or (N)o?\n"
        <<"::";
    getline(cin, answer);
    if(answer == "Y") {
        clientAStat = PAID;
        Astat = "PAID";
    }
    if(answer == "N") {
        clientAStat = LATE;
        Astat = "LATE";
    }

    //Client 2
    cout<<clientB <<" owes " <<clientBOwes <<".\n"
        <<"Has this client paid, (Y)es or (N)o?\n"
        <<"::";
    getline(cin, answer);
    if(answer == "Y") {
        clientBStat = PAID;
        Bstat = "PAID";
    }
    if(answer == "N") {
        clientBStat = LATE;
        Bstat = "LATE";
    }

    //Client 3
    cout<<clientC <<" owes " <<clientBOwes <<".\n"
        <<"Has this client paid, (Y)es or (N)o?\n"
        <<"::";
    getline(cin, answer);
    if(answer == "Y") {
        clientCStat = PAID;
        Cstat = "PAID";
    }
    if(answer == "N") {
        clientCStat = LATE;
        Cstat = "LATE";
    }
    cStatus = true;
}

cout<<fixed <<setprecision(2);
cout<<setw(4) <<"STATUS" <<setw(21) <<"CLIENT" <<'\n' <<endl;
cout<<setw(4) <<Astat <<setw(21) <<clientA <<'\n' <<endl;
cout<<setw(4) <<Bstat <<setw(21) <<clientB <<'\n' <<endl;
cout<<setw(4) <<Cstat <<setw(21) <<clientC <<'\n' <<endl;
cout<<'\n' <<endl;
}

Answer 1

您的代码运行良好，但我推荐 std 的新随机生成器！

改变

//Client 2
    cout<<clientB <<" owes " <<clientBOwes <<".\n"

//Client 3
    cout<<clientC <<" owes " <<clientBOwes <<".\n"

到

//Client 2
    cout<<clientB <<" owes " <<clientBOwes <<".\n"

//Client 3
    cout<<clientC <<" owes " <<clientCOwes <<".\n"

Answer 2

不是解决您当前问题的方法（请参阅@TheOtherGuy 对实际错误修复的回答），但您的代码过于复杂 - 您可以在不使用循环的情况下进行初始化，例如改变：

while(genNumber == false) {
    generateNumbers(genNum);//This is where the numbers are generated
    genCount++;
    if(genCount == 1) {
        genNum1 = genNum;
    }
    if(genCount == 2) {
        genNum2 = genNum;
    }
    if(genCount == 3) {
        genNum3 = genNum;
        bookKeeper.clientStatus(genNum1, genNum2, genNum3);
        genNumber = true;
    }
}

到：

generateNumbers(genNum1);
generateNumbers(genNum2);
generateNumbers(genNum3);
bookKeeper.clientStatus(genNum1, genNum2, genNum3);

并去掉变量genNum、genNumber、genCount。

Answer 3

复制代码，复制结果。尝试使用结构数组（或 c++ 向量）重新排列代码，并避免过度使用复制和粘贴。这将防止您犯愚蠢的错误，并提高您的编码技能。