5

我正在尝试在 c 中创建一个简单的程序，用户必须在几个选项之间进行选择：

char command = '1';
while(command!='0') {
    printf("Menu:\n");
    printf("1. First option\n");
    printf("2. Second option\n");
    printf("0. Exit\n");
    printf("Choose: 0,1,2?: ");
    command = getchar();
    while(getchar()!='\n');     
    switch(command) {
        case '0': break;
        case '1': functionCall1(); break; 
        case '2': functionCall2(); break;
    }
}

我的代码的问题是，每次我输入 1,2 或 0 时，什么都没有发生，只有菜单再次打印。使用调试器，我可以看到，在 command = getchar() 之后 command 的值等于''，每隔一次。我以为吃换行符就够了？

4

3 回答 3

5

试试我的自定义菜单，当我使用包含多项选择操作的程序时，我实现了它以使我的生活更轻松。菜单是可导航的（箭头：上、下、左、右），进行选择只需按回车键，菜单方向可以垂直或水平设置，填充可以设置为一组项目（子项），子起始位置，并延迟更新。

菜单调用示例（垂直）：

int response = menu("OPTIONS","[*]","->",
                    1,3,3,0,5,
                    "PROFILES","ACTIVITY","VIDEO","SOUND","GAMEPLAY");

最重要的是因为函数实现只需要 60 行代码。

菜单实现：

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <windows.h>

// LXSoft
// mod: cui/menu_021
// stdarg.h  -> used for variable list of arguments (va_list, va_start ...)
// windows.h -> used for Sleep function, for *nix use unistd.h

typedef unsigned short int usint_t;
// Menu function prototype
int menu(char* name, char* prefix, char* cursor, usint_t orientation,
         usint_t padding, usint_t start_pos, usint_t delay,
         usint_t num_childs, ...);

int main()
{
    int response = menu("OPTIONS","[*]","->",1,3,3,0,5,
                        "PROFILES","ACTIVITY","VIDEO","SOUND","GAMEPLAY");
    switch(response)
    {
        case 1:
            // doSomethingFoo1();
        break;
        case 2:
            //doSomethingFoo2();
        break;
        /*
         * .
         * .
         * .
         * case n:
         * break;
         */
    }
    printf("\nYour choice is: %d", response);
    return 0;
}

// Menu implementation
int menu
(
    char *name,        // Menu name (eg.: OPTIONS)
    char *prefix,      // Menu prefix (eg.: [*])
    char *cursor,      // Menu cursor (eg.: ->)
    usint_t orient,    /*
                        * Menu orientation vertical or horzontal.
                        * 0 or false for horizontal
                        * 1 or true for vertical
                        */
    usint_t padding,   // Menu childrens padding (eg.: 3)
    usint_t start_pos, // Menu set active child (eg.: 1)
    usint_t delay,     // Menu children switch delay
    usint_t childs,    // Number of childrens
    ...                /*
                        * Variable list of arguments char* type.
                        * Name of the childrens.
                        */
)
{
    va_list args;
    int tmp=0,pos;
    char chr;
    usint_t opt=start_pos;
    char* format=malloc
    (
        (
            strlen(name)+strlen(prefix)+strlen(cursor)+
            3+ /* menu suffix (1 byte) and backspace (2 bytes) */
            (2*childs)+ /* newline (2 bytes) times childs */
            (padding*childs)+ /* number of spaces times childs */
            childs*15 /* children name maxlen (15 bytes) times childs*/
        )*sizeof(char)
    );
    do
    {
        if(tmp!=0)chr=getch();
        if(chr==0x48||chr==0x4B)
            (opt>1&&opt!=1)?opt--:(opt=childs);
        else if(chr==0x50||chr==0x4D)
            (opt>=1&&opt!=childs)?opt++:(opt=1);
        else {/* do nothing at this time*/}
        strcpy(format,"");
        strcat(format,prefix);
        strcat(format,name);
        strcat(format,":");
        va_start(args,childs);
        for (tmp=1;tmp<=childs;tmp++)
        {
            (orient)?strcat(format,"\n"):0;
            pos=padding;
            while((pos--)>0) strcat(format," ");
            if(tmp==opt)
            {
                strcat(format,"\b");
                strcat(format,cursor);
            }
            strcat(format,va_arg(args,char*));
        }
        /*if(tmp!=childs)
        {
            fprintf(stderr,"%s: recieved NULL pointer argument,"
                           " child not named", __func__);
            return -1;
        }*/
        Sleep(delay);
        system("cls");
        printf(format);
        va_end(args);
    }while((chr=getch())!=0x0D);
    return opt;
}
于 2013-12-20T09:56:44.123 回答
1

可能您应该尝试将其int x用作键来使用所需的命令，可能是这样的：

while(x != 0)
{
    scanf("%d", &x);
    switch (x)
    {
        printf("input '2' to...\n");
        printf("input '3' to...\n");
        printf("input '4' to...\n");
        printf("input '5' to...\n");
        printf("input '6' to...\n");
        case 1:
            head = Enqueue(head);
            break;
        case 2:
            head1 = spisokMagazinovScenoiMensheiZadannoi(head, head1);
            break;
        case 3:
            head1 = udalenieElementa(head1);
            break;
        case 4:
            head1 = addNewMagazin(head1);
            break;
        case 5:
            head1 = addNewMagazin(head1);
            break;
        case 6:
            printToTheFile(head);
            break;

    }
}

我在以前的作业中使用过它。希望对你有用

于 2012-05-16T08:10:28.477 回答
0

这是我的 func 菜单示例。

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

int menu(char s[][80],int kolop){
    int pos = 0,push = 0,i,flag = 0;
    printf("MENU:\n>");
    puts(s[0]);
    for(i = 1;i < kolop;i++){
        printf(" ");
        puts(s[i]);
    }
    printf("Enter 5 to move the cursor down 8 to the top(Press ENTER to end)\n");
    do{
            if(flag == 1)
              printf("Error try to press 5,8 or ENTER\n");
            push = getch();
            flag = 1;
    }
    while(push != 56 && push != 53 && push != 13);
    flag = 0;
    system("cls");
    while(push != 13){
        if(push == 53){
            puts("MENU:");
            for(i = 0;i < kolop;i++){
                if(i == pos + 1 && flag == 0){
                    printf(">");
                    puts(s[i]);
                    flag = 1;
                    pos++;
                }
                else{
                    printf(" ");
                    puts(s[i]);
                }
            }
        }
        if(push == 56){
            puts("MENU:");
            for(i = 0;i < kolop;i++){
                if(i == pos - 1 && flag == 0){
                    printf(">");
                    puts(s[i]);
                    flag = 1;
                    pos--;
                }
                else{
                    printf(" ");
                    puts(s[i]);
                }
            }
        }
        _flushall();
        printf("Enter 5 to move the cursor down 8 to the top(Press ENTER to end)\n");
        flag = 0;
        do{
            if(flag == 1)
              printf("Error try to press 5,8 or ENTER\n");
            push = getch();
            flag = 1;
        }
        while(push != 56 && push != 53 && push != 13);
        flag = 0;
        system("cls");
    }
    pos++;
    return pos;
}

int main()
{
    SetConsoleCP(1251);
    SetConsoleOutputCP(1251);
    char s[][80] = {"1","2","3","4","5","6","7"};
    int i,pos = 0,push,flag = 0;
    pos = menu(s,7);
    printf("%d",pos);
    //system("cls");
  return 0;
}
于 2021-05-06T17:53:26.453 回答