c - 作为 switch 语句实现的菜单

Question

我想创建一个菜单，我需要在这个菜单中创建一些汽车(汽车、型号、颜色、价格)。我还需要从此菜单中修改或删除汽车。

这是我的代码:

#include <conio.h>
#include <stdio.h>
struct automobil
{
    unsigned nr;
    char Marca, Model, Culoare, Tara;
    float Pret;
} *VA[40];


int main()
{
    unsigned n, men;
    do
    {
        printf("Crearea vectorului ---- 1\n");
        printf("Afisarea datelor   ---- 2\n");
        printf("Adaugarea          ---- 3\n");
        printf("Modificarea        ---- 4\n");
        printf("Eliminarea         ---- 5\n");
        printf("Iesire             ---- 6\n");
        scanf("%u", &men);
        switch(men)
        {
            case 1: n = Intr(0); break;
            case 2: Afis(n); break;
            case 3: n = Intr(n); break;
            case 4: Modif(n); break;
            case 5: n = Elim(n); break;
        }
    }
    while (men != 0);

    unsigned Intr(unsigned i)
    {
        char rasp;
        do
        {
            VA[i].nr = i;
            printf("Introduceti Marca, Modelul, Culoarea, Tara si Pretul automobilului %u\n",i);
            scanf("%s, %s, %s, %s, %f", &VA[i].Marca, &VA[i].Model, &VA[i].Culoare, &VA[i].Tara, &VA[i].Pret);
            gets(VA[i].Marca);
            gets(VA[i].Model);
            printf("Mai introduceti date? [d / n]\n");
            scanf("%c", &rasp);
            i++;
        }
        while (rasp == 'd');
            return i;
    }

    void Afis(unsigned m)
    {
        unsigned i;
            for (int i = 0; i < m; i++)
            {
                printf("%u\n", VA[i].nr);
                puts(VA[i].Marca);
                puts(VA[i].Model);
                puts(VA[i].Culoare);
                puts(VA[i].Tara);
                printf("%f\n", VA[i].Pret);
            }
        getch();
    }

    void Modif(unsigned m)
    {
        unsigned i;
        Afis(m);
        printf("Introduceti numarul automobilului, datele carora le modificati.\n");
        scanf("%u", &nr);
            if (i >= m)
            {
                printf("Nr. inexistent!\n");
            }
            else
            {
                printf("Introduceti Marca, Modelul, Culoarea si Tara.\n");
                gets(VA[i].Marca);
                gets(VA[i].Model);
                gets(VA[i].Culoare);
                gets(VA[i].Tara);
                scanf("%f", &VA[i].Pret);
            }
    }

    unsigned Elim(unsigned m)
    {
        unsigned i;
        char rasp;
            do
            {
                Afis(m);
                printf("Nr de Automobile.\n");
                scanf("%u", &i);
                    if (i >= m)
                    {
                        printf("Numar inexistent.\n");
                    }
                    else
                    {
                        for (int j = i; j < m-1; j++)
                        {
                            VA[j] = VA[j+1];
                            m--;
                        }
                    }
                printf("Mai eliminati automobile? [d / n]\n");
                scanf("%c", &rasp);
            }
                while (rasp == 'd');
                return m;
    }
}

我收到的错误消息如下:

In function 'int main()':
25:23: error: 'Intr' was not declared in this scope "case 1: n = Intr(0); break;"
26:19: error: 'Afis' was not declared in this scope "case 2: Afis(n); break;"
28:20: error: 'Modif' was not declared in this scope "case 4: Modif(n); break;"
29:23: error: 'Elim' was not declared in this scope "case 5: n = Elim(n); break;"
35:3: error: a function-definition is not allowed here "before '{' token {"
115:2: error: expected '}' at end of input }
[Finished in 0.3s with exit code 1]

Answer 1

第 1 点:正确缩进代码。 while ();

之后缺少 main() 的右大括号 }

第 2 点。您需要对 main() 中使用但稍后定义的函数进行前向声明。否则，最好在 main() 之前定义所有其他函数(在使用之前定义)。

修复这些问题后，下一个痛苦将由 scanf("%c", &rasp); 产生。。这将吃掉最后一次输入后剩余的ENTER按键。最好使用 scanf("%c", &rasp); 类型的语句。

接下来，虽然通常 unsigned i; 将默认为 unsigned int i;，但恕我直言，最好使用后面的形式。