任何人都可以帮助我以不需要使用任何变量的方式重新编程吗？

Question

//This my code

#include <stdio.h>
#include <conio.h>


int processChoice()
{
    int choice = -1; //I need to execute this code without using any variable?  
    printf("\nMake a Choice (1, 2, 3 or 0): ");
    scanf("%d",&choice);
    printf("%d",choice);
    
    switch(choice)
    {
        case 0:
        printf("\nExiting...\n");
        break;
        case 1:
        printf("\nDrawing rectangle...\n");
        break;
        case 2:
        printf("\nDrawing Right triangle...\n");
        break;
        case 3:
        printf("\nDrawing isosceles triangle...\n");
        break;
        
        default:
        printf("\n** Invalid Choice! **\n");
        choice = -1;
    }
    return choice;
}

void showMenu()
{
    printf("\nMenu:");
    printf("\n1. Draw Rectangle");
    printf("\n2. Draw Right triangle");
    printf("\n3. Draw isosceles triangle");
    printf("\n0. Exit program\n");
}


int main()
{
    int x = -1;
    do
    {
        showMenu();
      
    }while(processChoice() != 0);
    return 0;
}

/* That's my code here I used a variable "int Choice = -1;" I'm supposed to execute the same code without using any variable as per guidelines of my mentor. Please help me with this */

我期望在不使用任何变量的情况下执行相同的代码。

Answer 1

也许你的导师意味着这个声明主要是

int x = -1;

未使用，应删除。

至于函数processChoice，那么在任何情况下您都需要输入用户的值。我看到使用函数 getchar 的以下方式在不使用变量的情况下编写函数的唯一可能性

int processChoice( void )
{
    printf("
Make a Choice (1, 2, 3 or 0): ");
    
    switch( getchar() )
    {
        case '0':
        printf("
Exiting...
");
        while ( getchar() != '
' );
        return 0;

        case '1':
        printf("
Drawing rectangle...
");
        while ( getchar() != '
' );
        return 1;

        case '2':
        printf("
Drawing Right triangle...
");
        while ( getchar() != '
' );
        return 2;

        case '3':
        printf("
Drawing isosceles triangle...
");
        while ( getchar() != '
' );
        return 3;
        
        default:
        printf("
** Invalid Choice! **
");
        while ( getchar() != '
' );
        return -1;
    }
}