故障调用函数C

如果要声明具有两个参数的函数，则应使用A，而不是＆amp;＆amp;您已经写了您的功能声明。在您的情况下，应该看起来像这样：

int deposit(float cbal, float scharge)
{
     //some code
}

但是，您已将CBAL和SCHARGE声明为全局变量，因此您的功能甚至不必将任何内容作为参数，您只能编写：

int deposit()
{
     //some code
}

此外，您的功能不返回任何内容，您真的想让它们int而不是无效？

编辑：我想我知道你想做什么。如果将变量声明为主循环中的本地变量，然后将它们传递到void函数，则将创建变量的副本，其值仅在该函数中会更改，在主循环中它们不会更改。然后，您可能需要将引用传递给它们，而不是将这些变量传递给它们，以使它们的价值更改也在void函数之外。然后，您必须将其定义为：

void deposit (float& cbal, float& scharge)
{
     //some code
}

但是，如果您调用函数，则正常通过参数：

deposit(cbal, scharge);

因此，由于您确切地告诉我您的功能应该做什么，因此我要发布正确的代码形式：

#include <string>
#include <iostream>
using namespace std;
//at first you have to at least declare the functions, you can also define them here or at the end of the code (as I did)
void check(float&, float&);
void deposit(float&, float&);
void endt(float&, float&, int&);
int main()
{
    float cbal;
    float scharge;
    float bal;
    char selection;
    int loopend = 1; //You can declare a variable with a value
    cout << "Transactions will take the form of a letter followed by a dollar amount. " <<
        "Valid letters are “C” for a check, “D” for a deposit, and “E” for the ending " <<
        "transaction(use zero on this transaction). Press <Enter> after each line of input!" << endl;
    cout << "Please enter inital balance: ";
    cin >> bal;
    cbal = bal; //Probably you wanted to assign the bal value to cbal, not bal = cbal
    while (loopend == 1)
    {
        cout << "Please enter a transaction" << endl;
        cin >> selection;
        if (selection == 'C' || selection == 'c')
        {
            check(cbal, scharge);
        }
        else if (selection == 'D' || selection == 'd')
        {
            deposit(cbal, scharge);
        }
        else if (selection == 'E' || selection == 'e')
        {
            endt(cbal, scharge, loopend);
        }
        else
        {
            cout << "Please enter a valid transaction.";
        }
    }
    return 0;
}
void check(float& cbal, float& scharge)
{
    int transaction;
    bool flag = false; //probably you wanted that to be false at the beggining(?)
    scharge += .15F; //shorter form of scharge = scharge + .15;
    cout << "What is the check amount?" << endl;
    cin >> transaction;
    cbal -= transaction; //same shorter form
    cout << "Transaction ammount: " << transaction << endl
        << "Current Balance: " << cbal << endl
        << "Service Charge Check: $0.15" << endl;
    if (cbal < 500 && flag == false)
    {
        scharge = scharge + 5;
        flag = true;
        cout << "Service Charge Below $500: $5.00";
    }
    cout << "Total Service Charges: " << scharge;
}
void deposit(float& cbal, float& scharge)
{
    int transaction;
    scharge += .10F;
    cout << "What is the deposit amount?" << endl;
    cin >> transaction;
    cbal += transaction;
    cout << "Deposit amount: " << transaction << endl
        << "Current Balance: " << cbal << endl
        << "Service Charge Deposit: $0.10" << endl
        << "Total Service Charges: " << scharge;
}
void endt(float& cbal, float& scharge, int& loopend)
{
    int transaction;
    cout << "Enter transaction amount: ";
    cin >> transaction;
    if (transaction == 0)
    {
        cout << "Transaction: End" << endl
            << "Current Balance: " << cbal << endl
            << "Total Service Charges: " << scharge << endl;
        cbal -= scharge;
        cout << "Final Balance: " << cbal;
        loopend = 2;
    }
    else
        cout << "Error: 0 was not the transaction amount";
}

您也可以使用全局变量：

#include <string>
#include <iostream>
using namespace std;
void check();
void deposit();
void endt();
float cbal, scharge, bal;
int loopend = 1;
int main()
{
    char selection;
    cout << "Transactions will take the form of a letter followed by a dollar amount. " <<
        "Valid letters are “C” for a check, “D” for a deposit, and “E” for the ending " <<
        "transaction(use zero on this transaction). Press <Enter> after each line of input!" << endl;
    cout << "Please enter inital balance: ";
    cin >> bal;
    cbal = bal; //Probably you wanted to assign the bal value to cbal, not bal = cbal
    while (loopend == 1)
    {
        cout << "Please enter a transaction" << endl;
        cin >> selection;
        if (selection == 'C' || selection == 'c')
        {
            check();
        }
        else if (selection == 'D' || selection == 'd')
        {
            deposit();
        }
        else if (selection == 'E' || selection == 'e')
        {
            endt();
        }
        else
        {
            cout << "Please enter a valid transaction.";
        }
    }
    return 0;
}
void check()
{
    int transaction;
    bool flag = false; //probably you wanted that to be false at the beggining(?)
    scharge += .15F; //shorter form of scharge = scharge + .15;
    cout << "What is the check amount?" << endl;
    cin >> transaction;
    cbal -= transaction; //same shorter form
    cout << "Transaction ammount: " << transaction << endl
        << "Current Balance: " << cbal << endl
        << "Service Charge Check: $0.15" << endl;
    if (cbal < 500 && flag == false)
    {
        scharge = scharge + 5;
        flag = true;
        cout << "Service Charge Below $500: $5.00";
    }
    cout << "Total Service Charges: " << scharge;
}
void deposit()
{
    int transaction;
    scharge += .10F;
    cout << "What is the deposit amount?" << endl;
    cin >> transaction;
    cbal += transaction;
    cout << "Deposit amount: " << transaction << endl
        << "Current Balance: " << cbal << endl
        << "Service Charge Deposit: $0.10" << endl
        << "Total Service Charges: " << scharge;
}
void endt()
{
    int transaction;
    cout << "Enter transaction amount: ";
    cin >> transaction;
    if (transaction == 0)
    {
        cout << "Transaction: End" << endl
            << "Current Balance: " << cbal << endl
            << "Total Service Charges: " << scharge << endl;
        cbal -= scharge;
        cout << "Final Balance: " << cbal;
        loopend = 2;
    }
    else
        cout << "Error: 0 was not the transaction amount";
}

我希望能解决您的问题。