C ++错误C4700

Question

我是编程新手，需要一些帮助！我得到＆＃34;错误C4700未初始化的局部变量＆＃34;在第23-26行，变量Cat1，Cat2，Cat3，EmpNum1，Pay1，EmpNum2，Pay2，EmpNum3和Pay3（如果重要的话，按顺序排列）

#include <iostream>
#include <fstream>
#include <iomanip>

using namespace std;
int main()
{
    ifstream PayFileIn;
    ofstream PayFileOut;
    PayFileIn.open("G:\\PayInFile.txt");                                        //change input file location per device
    PayFileOut.open("G:\\PayOutFile.txt");                                      //change input file location per device

    char Cat1, Cat2, Cat3;
    double Pay1, Pay2, Pay3;
    int EmpNum1, EmpNum2, EmpNum3;

    int AvgEmp = (Cat1 + Cat2 + Cat3) / 3;      //line 23                               //average number of total employees
    double AvgPay1 = Pay1 / EmpNum1;            //line 24                               //average pay for category 1
    double AvgPay2 = Pay2 / EmpNum2;            //line 25                               //average pay for category 2
    double AvgPay3 = Pay3 / EmpNum3;            //line 26                               //average pay for category 3
    double AvgPay4 = (Pay1 + Pay2 + Pay3) / (EmpNum1 + EmpNum2 + EmpNum3);      //average pay for total employees

    PayFileIn >> Cat1 >> Pay1 >> EmpNum1 >>
        Cat2 >> Pay2 >> EmpNum2 >>
        Cat3 >> Pay3 >> EmpNum3;

    cout << setprecision(2);
    cout << "The average number of employees is:    " << AvgEmp << endl <<
        "The average pay for Category 1 is:     " << AvgPay1 << endl <<
        "The average pay for Category 2 is:     " << AvgPay2 << endl <<
        "The average pay for Category 3 is:     " << AvgPay3 << endl <<
        "The average pay for all employees is:  " << AvgPay4 << endl << endl;
}

Answer 1

编译器消息非常清楚。您正在使用未初始化的变量。

// All uninitialized variables.
char Cat1, Cat2, Cat3;
double Pay1, Pay2, Pay3;
int EmpNum1, EmpNum2, EmpNum3;

您需要做的是移动线

int AvgEmp = (Cat1 + Cat2 + Cat3) / 3;      //line 23                               //average number of total employees
double AvgPay1 = Pay1 / EmpNum1;            //line 24                               //average pay for category 1
double AvgPay2 = Pay2 / EmpNum2;            //line 25                               //average pay for category 2
double AvgPay3 = Pay3 / EmpNum3;            //line 26                               //average pay for category 3
double AvgPay4 = (Pay1 + Pay2 + Pay3) / (EmpNum1 + EmpNum2 + EmpNum3);      //average pay for total employees

通过从PayFileIn读取变量初始化变量的行。

换句话说，使用：

char Cat1, Cat2, Cat3;
double Pay1, Pay2, Pay3;
int EmpNum1, EmpNum2, EmpNum3;

// Initialize the variables by reading into them from PayFileIn.
PayFileIn >> Cat1 >> Pay1 >> EmpNum1 >>
    Cat2 >> Pay2 >> EmpNum2 >>
    Cat3 >> Pay3 >> EmpNum3;

Now use them to compute other numbers.
int AvgEmp = (Cat1 + Cat2 + Cat3) / 3;      //line 23                               //average number of total employees
double AvgPay1 = Pay1 / EmpNum1;            //line 24                               //average pay for category 1
double AvgPay2 = Pay2 / EmpNum2;            //line 25                               //average pay for category 2
double AvgPay3 = Pay3 / EmpNum3;            //line 26                               //average pay for category 3
double AvgPay4 = (Pay1 + Pay2 + Pay3) / (EmpNum1 + EmpNum2 + EmpNum3);      //average pay for total employees

Answer 2

你知道它谈到的那些局部变量吗？

他们没有被初始化！

您正在计算中使用它们，但尚未给它们一个值。

尝试在计算之上移动以下行...这样，当代码按顺序执行时，将值放入变量的东西实际上会首先发生：

PayFileIn >> Cat1 >> Pay1 >> EmpNum1 >>
     Cat2 >> Pay2 >> EmpNum2 >>
     Cat3 >> Pay3 >> EmpNum3;