C/C++ examples

This is a discussion on C/C++ examples within the C++ Programming forums, part of the General Programming Boards category; OK, I guess I'll add my own AutoPtr class onto this thread. http://tech.groups.yahoo.com/group/boost/files/AutoPtr/...

  1. #16
    and the hat of sweating
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    OK, I guess I'll add my own AutoPtr class onto this thread.
    http://tech.groups.yahoo.com/group/boost/files/AutoPtr/

  2. #17
    msp
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    My version of animal guessing game in C:
    Code:
    #include <stdio.h>
    #include <stdlib.h>
    #include <ctype.h>
    
    struct tree_t
    {
            char* item;
            struct tree_t* left;
            struct tree_t* right;
    };        
    
    void getstr(char* s, int n)
    {
            char* p;
            fgets(s, n, stdin);
            for (p=s; *p; ++p)
            {
                    if (*p == '\n')
                    {
                            *p = '\0';
                            break;
                    }
            }
    }
    
    int yes()
    {
            char buff[16];
            fgets(buff, 16, stdin);
            return (tolower(buff[0]) == 'y');
    }
    
    int main()
    {
    
            struct tree_t* tree;
            char* guess;
            char* animal;
            char* ques;
    
            tree = malloc(sizeof(struct tree_t));
            tree->item = "bird";
            tree->left = tree->right = 0;
    
            while (1)
            {
                    printf("Are you thinking of an animal? ");
                    if (! yes()) break;
            
                    while(tree->left)
                    {
                            printf("&#37;s? ", tree->item);
                            if (yes())
                                    tree = tree->right;
                            else
                                    tree = tree->left;
                    }
            
                    guess = tree->item;
                    printf("Is it %s? ", guess);
                    if (yes())
                    {
                            printf("I rule!\n");
                            continue;
                    }
            
                    printf("What is the animal's name? ");
                    animal = malloc(64);
                    getstr(animal, 64);
                    printf("What question would distinguish a %s from a %s? ", animal, guess);
                    ques = malloc(256);
                    getstr(ques, 256);
                            
                    tree->item = ques;
                    printf("If the animal were %s the answer would be? ", animal);
                    tree->left = malloc(sizeof(struct tree_t));
                    tree->right = malloc(sizeof(struct tree_t));
                    if (yes())
                    {
                            tree->left->item = guess;
                            tree->right->item = animal;
                    }
                    else
                    {
                            tree->left->item = animal;
                            tree->right->item = guess;
                    }
                    tree->left->left = tree->left->right = 0;
                    tree->right->left = tree->right->right = 0;
            }
            return 0;
    }
    Last edited by msp; 09-05-2007 at 02:41 AM. Reason: Corrected some minor code errors

  3. #18
    and the hat of wrongness Salem's Avatar
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    > #include <malloc.h>
    Use stdlib.h for prototyping malloc

    > return ((buff[0] | 32) == 'y');
    toupper() or tolower() would be a lot easier to understand, and not limited to systems using ASCII.

    Your main() has no return statement.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  4. #19
    msp
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    Thanks Salem for pointing this out!
    I have made the modifications.

  5. #20
    msp
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    Print the binary tree on console in a visual way
    Attached Files Attached Files

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