Question

我需要有关以下代码的公式的帮助：

#include <stdio.h>
void main()
{
    int MAGNUM, AK47, Knife, Axe, total;
    char choice, choice2, confirm;

    MAGNUM = 75;
    AK47 = 150;
    Knife = 40;
    Axe = 20;

    printf("Welcome to weapon store.\n");
    printf("Over here, we sell cheap weaponry you may be interested in.\n");
    printf("Currently, this is what we have for sale:\n\n\n");
    printf("(A) .44 MAGNUM\n");
    printf("(B) AK-47\n");
    printf("(C) Laredo Bowie knife\n");
    printf("(D) Tomahawk axe\n\n\n");
    printf("Pick one to buy, just type the letter in caps of the item and press enter.\n");
    printf("ITEM SELECTED:");
    scanf("%c", &choice);   //First input//

    if (choice == 'A')
    {
        printf("That will be $%d.\n", MAGNUM);
    }

    if (choice == 'B')
    {
        printf("That will be $%d.\n", AK47);
    }
    if (choice == 'C')
    {
        printf("That will be $%d.\n", Knife);
    }
    if (choice == 'D')
    {
        printf("That will be $%d.\n", Axe);
    }
    printf("Do you want to buy anything else?<Y//N>\n");    //Second input//
    scanf(" %c", &choice2);

    if (choice2 == 'Y')
    {
        printf("What else do you want to buy:");    //Third input//
        scanf(" %c", &confirm);
        if (confirm == 'A')
        {
            printf("That will be $%d.\n ", MAGNUM);
        }
        else if (confirm == 'B')
        {
            printf("That will be $%d.\n", AK47);
        }
        else if (confirm == 'C')
        {
            printf("That will be $%d.\n", Knife);
        }
        else if (confirm == 'D')
        {
            printf("That will be $%d.\n", Axe);
        }

        total = choice + confirm;   //Need help with formula here. total equals first input + third input//

        printf("Total cost is $%d. Thank you.\n", total);
    }
    else
    {
        printf("Thank you for shopping with us.\n");    
    }
}

调试时，如果将它们加在一起，它将不会显示输入1和3的正确值。

例如，如果我分别为输入1和3选择D然后再选择D，那么我应该总共获得40美元，但我获得了不同的$ 136值。

这可能是我目前缺乏C知识，因为我两天前才开始。这段代码只是我对基础知识的一个测试基础，比如if else语句等，所以如果代码中的内容可能会冒犯任何人，我会道歉。

Answer 1

您要添加的是字符值而不是价格。

68是'D'被解释为整数。 68 + 68 = 136。

我会在if语句中添加价格，例如

if (choice == 'D')
{
printf("That will be $%d.\n", Axe);
total=total+Axe;
}

Answer 2

（代表OP发布）。

将C ++作为标题是我的错误。没有意识到这一点。之前也不知道字符值。

初始化一个grandtotal = total1 + total2，其中total1表示输入1的选择结果的值，而total2表示输入3的选择结果的值，解决了问题。

C公式无法得到正确的值

2 个答案: