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我正在为硬件编写一个 POS 系统，我不得不使用我的第一个代码，它使用了数百个变量并将其更改为使用数组的更紧凑的程序。这是我的新代码：

    #include <stdlib.h>
    #include <stdio.h>
    #include <conio.h>

//---------------------------------------------------------------------------------------------------------
//---------------------------------------------------------------------------------------------------------
//------------------------------------------Declaring-Variables--------------------------------------------
//---------------------------------------------------------------------------------------------------------
//---------------------------------------------------------------------------------------------------------


//Discount Variables
int iPerPurchaseDiscountPercent = 0; //enter a number which will be later changed to a percentage 
int iFinalPurchaseDiscountPercent = 0;//enter a number which will be later changed to a percentage
float fPerPurchaseDiscountPercent = 0;//the percentage value of discount per item
float fFinalPurchaseDiscountPercent = 0;//percentage value of final dicount
float fPerPurchaseDiscountPrice = 0;//price at which discounts will be applied
float fFinalPurchaseDiscountPrice = 0;//price at which the final shop discount will be appled

//Array values for math
float fItemPrice[100] = { 0 }; //Price of Item
int   iItemQuantity[100] = { 0 }; //Quantity of that Item
float fBundleCost[100] = { 0 }; //Price before Discounts (fItemPrice[N] * fItemQuantity[N])
float fDiscountPerItem[100] = { 0 }; //What discount is recieved per item (fItemPrice[N] * iPerPurchaseAmount)
float fItemTotalDiscountRecieved[100] = { 0 }; //Total discount recieved on multiple items of same type (fDicountPerItem * iItemQuantity)
float fDiscountPrice[100] = { 0 };//Price for item after all discounts (fBundleCost - fDiscountRecieved)


//Values for while loop
bool bStillShopping = true;
int iItemCount = 0;
char cExitQuestion = 'y';


//---------------------------------------------------------------------------------------------------------
//---------------------------------------------------------------------------------------------------------
//-----------------------------------------------Prototyping-----------------------------------------------
//---------------------------------------------------------------------------------------------------------
//---------------------------------------------------------------------------------------------------------


//---------------------------------------------------------------------------------------------------------
//---------------------------------------------------------------------------------------------------------
//------------------------------------------------Main-Loop------------------------------------------------
//---------------------------------------------------------------------------------------------------------
//---------------------------------------------------------------------------------------------------------
int main(void)
{
printf("Welcome to Blacketts bookstore!\t\t\t\t\t\tPOS V2\n");

//Taking values for the per item discounts
printf("Please enter the price that discounts per item will be applied: ");
flushall();
scanf("%f", &fPerPurchaseDiscountPrice); //takes the value at which items will be discounted
printf("Please enter the percentage to be applied at this price: ");
flushall();
scanf("%d", &iPerPurchaseDiscountPercent); //takes a value eg 10 to be later changed to .1 for 10%
fPerPurchaseDiscountPercent = iPerPurchaseDiscountPercent/100; //changes the int to a float and makes it appropriate for percentage calculations

//Taking values for the final purchase discount
printf("Please enter the price that end of sale discounts will be applied to: "); 
flushall();
scanf("%f", &fFinalPurchaseDiscountPrice); //takes the value at which the whole docket will be discounted by
printf("Please enter the percentage to be applied at this price: ");
flushall();
scanf("%d", &iFinalPurchaseDiscountPercent);//takes a value eg 5 to be later changed to .05 for 5%
fFinalPurchaseDiscountPercent = iFinalPurchaseDiscountPercent/100; //changes the int to a float and make it appropriate for percentage calculations

//While loop to take values and input them into appropriate places
while(bStillShopping == true)
{
    iItemCount = 1; // Counting how many items are being purchased, 0 = 1st item. therefore Total quantity Items must equal iItemCount+1

    printf("\nPlease enter the price of the first item to be purchased: "); //enter price of item
    flushall();
    scanf("%.2f", fItemPrice[iItemCount]);

    printf("Please enter the quantity of that item: "); //enter quantity
    flushall();
    scanf("%d", iItemQuantity[iItemCount]);

    printf("\nWould you like to enter any more Items? (y/n): "); //ask to continue
    flushall();
    scanf("%c", &cExitQuestion);

    if(cExitQuestion == 'n')
    {
        bStillShopping = false; //if dont want to continue exit the loop
    }
    else
    {
        iItemCount++; //if do continue increment item loop and ask for more variables
    }
}


getch();
}

当我开始输入数量时iItemQuantity[iItemAmout]，程序会因未处理的异常而崩溃。我还在代码之间做了一些调试打印语句，以查看它到达的位置并输出我输入的变量和返回的值不匹配，我收到的都是0.00.

非常感谢您的帮助，我希望我不会在其他地方问一个已经回答的问题。仍然不知道如何浏览该网站。

我知道代码目前没有做任何其他事情，但在第一个问题得到纠正之前，我看不到继续的意义。

4

2 回答 2

1

也用于&数组scanf元素

像这样

scanf("%.2f", &fItemPrice[iItemCount]);

scanf("%d", &iItemQuantity[iItemCount]);
于 2013-03-19T10:09:39.103 回答
0

问题是scanf期望指向值的指针，而不是实际值本身。您在循环之前正确执行此操作，但不适用于循环内的输入。

改变例如

scanf("%.2f", fItemPrice[iItemCount]);

到

scanf("%.2f", &fItemPrice[iItemCount]);

或者

scanf("%.2f", fItemPrice + iItemCount);

对所有输入执行相同操作。

于 2013-03-19T10:10:44.310 回答