c - 使用 int 数组作为 switch case

Question

我对 C 相当陌生，我正在尝试使用 int 数组作为这样的开关的选项号

void totalEntered(float * total, float * inputFigure)
{
    *total = *total + *inputFigure;
}

int main()
{
    float amountEntered = 0.00;
    float tot = 0.00;
    int option_numbers[3] = {1,2,3,4};
    float a_food = 0.00;
    float a_tab = 0.00;
    float a_trav = 0.00;
    float a_bill = 0.00;

    totalEntered(&tot, &amountEntered);



    printf("Please enter option number from below \n1.food\n2.tabacco\n3.travel\n4.bills\n");
    scanf("%i", option_numbers);
    switch(option_numbers)
    {
    case 1:
        printf("Please Enter an amount: ");
        scanf("%f", amountEntered);
        a_food = a_food + amountEntered;
        totalEntered(&tot, &amountEntered);
        printf("You have spent %f on food", a_food);
        break;
    case 2: /*ignore below haven't finish that*/
        a_tab = a_tab + amountEntered;
        printf("You have spent %.2f on tabacco", a_tab);
        break;
    case 3:
        a_trav = a_trav + amountEntered;
        printf("You have spent %.2f on travel", a_trav);
        break;
    case 4:
        a_bill = a_bill + amountEntered;
        printf("You have spent %.2f on travel", a_bill);
        break;
    default:
        printf("You have not input a category!");
        break;
    }
    return 0;


}

任何人都可以建议如何解决这个问题...我有点卡住了! :D 我试图让用户选择一个数字，如果用户想在食物下输入一个金额，他/她必须选择选项 1，然后选择一个金额。希望这比以前更有意义! 谢谢

Answer 1

您无法将数组传递给 switch()，您需要传递数组中的元素之一:

int item = 2; // or whatever

switch(option_numbers[item])
{

<小时/>

编辑:
根据您的评论，如果您想接受用户输入并让他们选择 4 个选项之一，这非常简单，完全不需要该数组。

int selection = -1;
printf("Which option do you want? (1-4): ");
scanf("%d", &selection);

switch(selection)
{

<小时/>

旁注:

int option_numbers[3] = {1,2,3,4}; // that's not size 3, it's got 4 elements should 
                                   // have been:
                                   // int option_numbers[4] = {1,2,3,4};