请大家帮小弟看看这程式的ERROR(新的error)

evo9

小弟的project 是banking system....
小弟大概写了一个draft,可是有5个error解决不到，是compline 后得到的error,
所以，请各位长辈帮忙看看....

//This Peoject is about system banking.
#include<iostream>
#include<fstream>
#include<cstdlib>
using namespace std;


double storemoney(double);
double takeoutmoney(double);
double checking(double);
int main()
{
        int a;
        int sm;
        int tom;
        int cm;

        cout<<"ATM BANK OF EVOLUTION\n\n\n";
        cout<<"1.SAVING\n";
        cout<<"2.DRAWING\n";
        cout<<"3.CHECKING ACCOUNT\n";
        cout<<"4.Quit\n\n";
        cout<<"Please Enter A Number\n";
        cin>>a;

        if (a=1)
                storemoney(sm);
        else if        (a=2)
                takeoutmoney(tom);
        else if (a=3)
                checking(cm);
        else
                cout<<"Thank You\n"<<"Please Come Again\n";


        return 0;
}

//function to store money
double storemoney(double sm)
{
        int earn;
        cout<<"How much you want to store?\n";
        cin>>earn;
        cout>>"You have store <<earn<< in the bank\n";
        cout>>"Your balance in the account is xxx\n";
        return 0;
}

//function to take out money from bank
double takeoutmoney(double tom)
{
        int lose;
        cout<<"How much you want to take out?\n";
        cin >>lose;
        cout>>"You have take out <<lose<< from the bank";
        cout>>"Your balance in the account is xxx\n";
        return 0;
}

//function to checking account
double checking(double cm)
{
        cout>>"Your balance in the bank is xxx\n";
        return 0;
}

[ 本帖最后由 evo9 于 16-11-2005 11:24 PM 编辑 ]

titanhrk

原帖由 evo9 于 9-11-2005 11:46 PM 发表
小弟的project 是banking system....
小弟大概写了一个draft,可是有5个error解决不到，是compline 后得到的error,
所以，请各位长辈帮忙看看....

//This Peoject is about system banking.
#include<ios ...

cout过后的expression是<<,不是>>
这是我该的几行，不算是大问题，应该是你粗心吧。

cout<<"You have store"<<earn<<" in the bank\n";
cout<<"Your balance in the account is xxx\n";

cout<<"You have take out "<<lose<< "from the bank";
cout<<"Your balance in the account is xxx\n";

cout<<"Your balance in the bank is xxx\n";

莫名奇妙

1.) cout 箭頭方向錯了
double storemoney(double sm)
{
        int earn;
        cout<<"How much you want to store?\n";
        cin>>earn;
        cout>>"You have store <<earn<< in the bank\n";
        cout>>"Your balance in the account is xxx\n";
        return 0;
}

2.) 邏輯錯誤,不是 a=1 , 應該是 a == 1 ,
    這個錯誤很常犯而且很難debug,以後要注意

        if (a=1)
                storemoney(sm);
        else if        (a=2)
                takeoutmoney(tom);
        else if (a=3)
                checking(cm);
        else
                cout<<"Thank You\n"<<"Please Come Again\n";

莫名奇妙

瓦,被搶先了   

evo9

谢谢大家，请问一下的warning 是什么意思？

Compiling...
main.cpp
C:\Documents and Settings\David\Desktop\banking system Project\main.cpp(27) : warning C4700: local variable 'sm' used without having been initialized
C:\Documents and Settings\David\Desktop\banking system Project\main.cpp(29) : warning C4700: local variable 'tom' used without having been initialized
C:\Documents and Settings\David\Desktop\banking system Project\main.cpp(31) : warning C4700: local variable 'cm' used without having been initialized

jasonmun

warning 警告,

initialize 后的 variables
必须给一个value,
否则程序可能会出现问题..

evo9

原帖由 jasonmun 于 10-11-2005 09:28 AM 发表
warning 警告,

initialize 后的 variables
必须给一个value,
否则程序可能会出现问题..

//This Peoject is about system banking.
#include<iostream>
#include<fstream>
#include<cstdlib>
using namespace std;


double storemoney(double);
double takeoutmoney(double);
double checking(double);
int main()
{
        int a;
        int sm;
        int tom;
        int cm;

        cout<<"ATM BANK OF EVOLUTION\n\n\n";
        cout<<"1.SAVING\n";
        cout<<"2.DRAWING\n";
        cout<<"3.CHECKING ACCOUNT\n";
        cout<<"4.Quit\n\n";
        cout<<"Please Enter A Number\n";
        cin>>a;

        if (a==1)
                storemoney(sm);
               
        else if        (a==2)
                takeoutmoney(tom);
        else if (a==3)
                checking(cm);
        else
                cout<<"Thank You\n"<<"Please Come Again\n";


        return 0;
}

//function to store money
double storemoney(double sm)
{
        int earn;
        cout<<"How much you want to store?\n";
        cin>>earn;
        cout<<"You have store "<<earn<<" in the bank\n";
        cout<<"Your balance in the account is xxx\n";
        return 0;
}

//function to take out money from bank
double takeoutmoney(double tom)
{
        int lose;
        cout<<"How much you want to take out?\n";
        cin >>lose;
        cout<<"You have take out <<lose<< from the bank";
        cout<<"Your balance in the account is xxx\n";
        return 0;
}

//function to checking account
double checking(double cm)
{
        cout<<"Your balance in the bank is xxx\n";
        return 0;
}






我的是要user enter 才会有value, 之前是没有的，可是要怎样initialized?

苦瓜汤

我搞不懂你的sm, tom, cm这三个parameter是用来干嘛的？

flashang

注意你的符號, 一般上會製造很多預想不到的 bug


cout<<"You have store "<<earn<<" in the bank\n";

cout<<"You have take out <<lose<< from the bank";

evo9

小弟的这段function 有问题....
account的data 数据是100，我store 20, balance 还是100，我要的是120....

//function to store money
double storemoney(double sm)
{
        int earn;
        ifstream infile;
        int sum=0;

        infile.open("account.dat");
        if(infile)
        {

                cout<<"How much you want to store?\n";
                cin>>earn;
                cout<<"You have store "<<earn<<" in the bank\n";
                infile>>earn;
                sum=sum+earn;
                cout<<"Your balance in the account is "<<sum<<""<<endl;

                infile.close();
        }
        else
        {
                cerr<<"Unable to open the account data"<<endl;
        }

        return 0;
}

evo9

昨天的问题解决了，要谢谢雨吟
谢谢你哦....

现在小弟有几个问题，为什么我的if statement 不能这样放？
if(n<=0&&n=ch)
    cout<<"invalid input\n";

我要的是不能输入character...
请各位大大帮忙...

evo9

最新问题，以上的解决了，为什么不能够选y/n,会auto跳到okie去.....

//function to store money
double storemoney(double sm)
{
        int earn;
        ifstream infile;
        ofstream outacc;
        ofstream outfile;
        int accmoney;
        char ch;
        char confirm;

infile.open("account.dat");
        if(infile)
        {
       
        while(infile >> accmoney )
                {
                         
                        cout<<"How much you want to store?\n";
                        cin>>earn;
                        if(earn<=0&&ch)
                                {                       
                                        cout<<"Invalid Input\n";
                                        goto again;
                                }                                                       
                        else if(earn>0)
                        {
                                cout<<"You have store "<<earn<<" in the bank\n";
                                accmoney = accmoney + earn;
                                blmoney:cout<<"Your balance in the account is "<<accmoney<<""<<endl;
                        }
                        else
                        {       
                                        again:cout<<"Do You Want to Store Again?(Y/N)\n";
                                        cin>>confirm;
                                       
                                        if(confirm='y'||'Y')
                                                cout<<"okie\n";
                                        else if(confirm='n'||'N')
                                                goto blmoney;
                                        else
                                                cout<<"Invalid Input";
                                       

                        }
                }
               
                infile.close();

                outacc.open("account.dat");
                outacc<<accmoney;
                outacc.close();

                outfile.open("result.dat");
                if(!outfile)
                {
                        cerr<<"result.dat could not be opened";
                }
                else
                {
                        outfile<<"The account balance is "<<accmoney<<""<<endl;
                        outfile.close();
                }
        }
        else
        {
                cerr<<"Unable to open the account data"<<endl;
        }

        return 0;
}