C：警告：“withdrawal_amt'可能在这个函数中使用未初始化 [英] C: warning: ‘withdrawal_amt’ may be used uninitialized in this function

问题描述

我写一个程序为我介绍到C级，并不断收到一些警告，当我尝试用gcc来编译。

下面是我的code：

  INT的main（）
{
浮动平衡;
浮beg_balance;
浮withdrawal_amt;
浮deposit_amt;
浮动量;
INT total_withdrawals;
INT total_deposits;
INT选择;print_greeting（）;的printf（让我们与您的期初余额开始）;
beg_balance = get_positive_value（）;
做
{
print_menu（）;
scanf函数（％d个，＆安培;选择）;开关（选择）
  {
  案件中退出：
    get_positive_value（）;
    余额=撤离（平衡，withdrawal_amt，数量）;
    打破;
  案例押金：
    get_positive_value（）;
    余额=存款（余额，deposit_amt，数量）;
    打破;
  病例摘要：
print_receipt（total_withdrawals，total_deposits，beg_balance，平衡，\\
withdrawal_amt，deposit_amt）;
    打破;
  案例QUIT：
    打破;
  默认：printf的（无效的选择）;
  打破;
  }
}
而（选择= 4！）;返回0;
 

在编译时我正的错误是这样的：

  project.c：在函数'主'：
project.c：46：警告：withdrawal_amt'可能在这个函数中使用未初始化
project.c：46：警告：'量'可能在这个函数中使用未初始化
project.c：50：警告：deposit_amt'可能在这个函数中使用未初始化
project.c：53：警告：total_withdrawals'可能在这个函数中使用未初始化
project.c：53：警告：total_deposits'可能在这个函数中使用未初始化
 

任何想法，为什么？谢谢

编辑：

现在我有麻烦创建用于打印出账户的交易历史寄存器功能。它应该打印出开头和期末余额，以及显示发生的所有交易（存款和提款）的表。任何帮助将大大AP preciated

解决方案

 浮动平衡;
浮beg_balance;
浮withdrawal_amt;
浮deposit_amt;
 

您从未它们的属性的任何值。这就像如果你写：

 情况下押金：
get_positive_value（）;
余额=存款（余额（浮点），金额）;
打破;
 

您需要初始化他们像：

 浮withdrawal_amt = 0.0;
 

I am writing a program for my intro to C class and keep getting some warnings when I try to compile with gcc.

Here is my code:

int main ()
{
float balance;
float beg_balance;
float withdrawal_amt;
float deposit_amt;
float amount;
int total_withdrawals;
int total_deposits;
int selection;

print_greeting ();

printf("Let's begin with your beginning balance");
beg_balance = get_positive_value();
do
{
print_menu ();
scanf("%d", &selection);

switch (selection)
  {
  case WITHDRAWAL:
    get_positive_value();
    balance = withdrawal(balance, withdrawal_amt, amount);
    break;
  case DEPOSIT:
    get_positive_value();
    balance = deposit(balance, deposit_amt, amount);
    break;
  case SUMMARY:
print_receipt(total_withdrawals, total_deposits, beg_balance, balance, \
withdrawal_amt, deposit_amt);
    break;
  case QUIT:
    break;
  default: printf("Invalid selection");
  break;
  }
}
while(selection != 4);

return 0;

The errors I am getting when compiling is this:

project.c: In function ‘main’:
project.c:46: warning: ‘withdrawal_amt’ may be used uninitialized in this function
project.c:46: warning: ‘amount’ may be used uninitialized in this function
project.c:50: warning: ‘deposit_amt’ may be used uninitialized in this function
project.c:53: warning: ‘total_withdrawals’ may be used uninitialized in this function
project.c:53: warning: ‘total_deposits’ may be used uninitialized in this function

Any ideas why? Thank you

EDIT:

Now i am having trouble creating a register function that is used to print out the transaction history of the account. It should print out the beginning and ending balances, as well as a table that shows all transactions (Deposits and Withdraws) that have occurred. Any help would be greatly appreciated

解决方案

float balance;
float beg_balance;
float withdrawal_amt;
float deposit_amt;

You never attribute them any value. it's like if you wrote :

case DEPOSIT:
get_positive_value();
balance = deposit(balance, (float), amount);
break;

You need to init them like :

float withdrawal_amt = 0.0;

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