C++ 是否使用未初始化的局部变量？

课堂练习有问题吗

#include <iostream>
#include <string>
using namespace std;

int main()
{
    int employeeNumber, grossPay, stateTax, federalTax, ficaHold;
    int totalGross, totalState, totalFederal, totalFica, totalPay = 0;


    do // do-while loop for employee number
    {
        cout << "Enter the employee number: " << endl;
        cout << "(Enter 0 to quit.)" << endl;
        cin >> employeeNumber;

    } while (employeeNumber < 0);

    while (employeeNumber != 0)
    {
        do // gross pay greater than state tax + federal tax + FICA
        {
            do // entry and validation for gross pay
            {
                cout << "How much gross pay ? ";
                cin >> grossPay;
            } while (grossPay < 0);


            do //entry and validation for state tax
            {
                cout << "How much state tax ? ";
                cin >> stateTax;
            } while (stateTax < 0 || stateTax > grossPay);


            do // entry and validation federal tax
            {
                cout << "How much federal tax ? ";
                cin >> federalTax;
            } while (federalTax < 0 || federalTax > grossPay);


            do // entry and validation for FICA holdings amount
            {
                cout << "How much FICA withholdings ? ";
                cin >> ficaHold;
            } while (ficaHold < 0 || ficaHold > grossPay);


            if (grossPay < stateTax + federalTax + ficaHold) // Message to verify taxes are not greater than pay
                cout << "State tax, federal tax, and FICA holdings cannot be greater than gross pay. Please re-enter these values." << endl;


        } while (grossPay < stateTax + federalTax + ficaHold);


        totalGross += grossPay;
        totalState += stateTax;
        totalFederal += federalTax;
        totalFica += ficaHold;
        totalPay = totalGross - (totalState + totalFederal + totalFica);

        do // do-while loop for employee number
        {
            cout << "Enter the employee number: " << endl;
            cout << "(Enter 0 to quit.)" << endl;
            cin >> employeeNumber;
        } while (employeeNumber < 0);

    }

    cout << endl << endl << "The total gross pay is: $" << totalGross << endl;
    cout << "The total state tax is :" << totalState << endl;
    cout << "The total federal tax :" << totalFederal << endl;
    cout << "The total FICA withholdings :" << totalFica << endl;
    cout << "Net pay :" << totalPay << endl << endl;
    return 0;
}

#包括
#包括
使用名称空间std；
int main（）
{
国际雇员号、格罗斯佩、州税、联邦税、菲卡霍尔德；
int totalGross、totalState、totalFederal、totalFica、totalPay=0；
do//do while循环查找员工编号
{
国家税收；
}而（州税<0 | |州税>grossPay）；
do//entry and validation联邦税
{
联邦税；
}而（联邦税<0 | |联邦税>grossPay）；
do//FICA控股金额的输入和验证
{
库特>菲卡霍尔德；
}而（ficaHold<0 | | ficaHold>grossPay）；
if（grossPaycout第一次使用
totalState
时，您正在读写：
totalState+=stateTax；
。问题是您从未初始化过
totalState
，因此无法保证在尝试读取它时值会是多少

作为记录，您有：
totalGross
、
totalFederal
和
totalFica
“我已经在任何循环之前的声明中给出了这些变量的值”没有。只有
totalPay
是用
0
初始化的。非常感谢@songyuanyao，我以为如果用逗号分隔，你可以列出所有变量，将它们初始化为相同的数字，但我搞错了。像这样初始化多个变量的正确方法是什么，或者是列出“int a=0；int b=0；…等”是唯一的方法？或者
int a=0，b=0，…；
。在我看来，最好每行定义一个变量。