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c - 减少我的 if 语句中的代码量的问题

问题描述

我正在编写我的第一个 C 程序，没有一种方法可以弄清楚如何减小 if 语句的大小，出于某种原因，我认为它有点太长了。我尝试减少代码行数，使用它，但是当我更改某些内容时，我测试它时不会出现一些消息，例如购买成功或失败。我知道这是一个初学者的问题。你能帮我吗，如果可能的话，提供一些关于使用什么和研究以使其更简洁的提示？

if (input == 'A') {
            calculation = budget - apple;

            if (calculation >= 0) {
                printf("Purchase was a success!\n");
                printf("Purchase details\n");
                printf("----------------------\n");
                printf("Item: %c\n", input);
                printf("Price: \x9C%.2f\n", apple);
                printf("Remaining budget: \x9C%.2f\n\n", calculation);
                printf("Thanks for shopping with us!");
            } 
            else {
                printf("Purchase FAILED!\n");
                printf("Low budget or invalid item!\n\n");
                printf("Thanks for shopping with us!");
            }
    } else if (input == 'O') {
            calculation = budget - orange;

            if (calculation >= 0) {
                printf("Purchase was a success!\n");
                printf("Purchase details\n");
                printf("----------------------\n");
                printf("Item: %c\n", input);
                printf("Price: \x9C%.2f\n", orange);
                printf("Remaining budget: \x9C%.2f\n\n", calculation);
                printf("Thanks for shopping with us!");
            }
            else {
                printf("Purchase FAILED!\n");
                printf("Low budget or invalid item!\n\n");
                printf("Thanks for shopping with us!");
            }
    } else if (input == 'P') {
            calculation = budget - pear;

            if (calculation >= 0) {
                printf("Purchase was a success!\n");
                printf("Purchase details\n");
                printf("----------------------\n");
                printf("Item: %c\n", input);
                printf("Price: \x9C%.2f\n", pear);
                printf("Remaining budget: \x9C%.2f\n\n", calculation);
                printf("Thanks for shopping with us!");
            }
            else {
                printf("Purchase FAILED!\n");
                printf("Low budget or invalid item!\n\n");
                printf("Thanks for shopping with us!");
            }
    } else {
        printf("Purchase FAILED!\n");
        printf("Low budget or invalid item!\n\n");
        printf("Thanks for shopping with us!");
    };

标签： c

解决方案

创建一个临时变量（例如fruits），并使用input“无效项目”使用其他不可能的值来确定它应该设置为什么，例如：

    if (input == 'A') {
        fruits = apple;
    } else if (input == 'O')
        fruits = orange;
    } else if (input == 'P') {
        fruits = pear;
    } else {
        fruits = -1;            // Invalid item
    }

一旦完成，剩下的就可以变成：

    if(fruits != -1) {
        calculation = budget - fruit;
        if (calculation >= 0) {
            printf("Purchase was a success!\n");
            printf("Purchase details\n");
            printf("----------------------\n");
            printf("Item: %c\n", input);
            printf("Price: \x9C%.2f\n", fruits);
            printf("Remaining budget: \x9C%.2f\n\n", calculation);
            printf("Thanks for shopping with us!");
        }  else {
            fruits = -1;               // Low budget or invalid item!
        }
    }
    if(fruits == -1) {          
        printf("Purchase FAILED!\n");
        printf("Low budget or invalid item!\n\n");
        printf("Thanks for shopping with us!");
    }

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