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The Programming Challenge Master Thread - Page 23

post #221 of 263
Quote:
Originally Posted by tompsonn View Post

How? Lol.

oh yeah, that would require 5 different switches blocks - which would be more verbose than if statements. doh.gif

That'll teach me correcting other peoples code pre morning coffee. laugher.gif
post #222 of 263
Quote:
Originally Posted by Plan9 View Post

oh yeah, that would require 5 different switches blocks - which would be more verbose than if statements. doh.gif
That'll teach me correcting other peoples code pre morning coffee. laugher.gif

For the record, the "non-nested IF example":
Code:
void nonNestedIfExample()
{
        int atomic = 1;
        char *string1 = (char*) try_calloc(STRING_MAX, sizeof(char), &atomic );
        char *string2 = (char*) try_calloc(STRING_MAX, sizeof(char), &atomic );
        char *string3 = (char*) try_calloc(STRING_MAX, sizeof(char), &atomic );
        char *string4 = (char*) try_calloc(STRING_MAX, sizeof(char), &atomic );
        char *string5 = (char*) try_calloc(STRING_MAX, sizeof(char), &atomic );

        if ( atomic )
        {
                /* important code goes here */
        }
}

/* try_calloc, located in some helper header file. error checking omitted */
void* try_calloc( size_t num, size_t size, int* atomic )
{
        if ( !*atomic )
                return 0;

        void* ptr = calloc( num, size );
        *atomic = ( int ) ( ptr != 0 );

        if ( !*atomic )
                free( ptr );

        return ptr;
}

Beats the hell out of goto (readability), but not quite as performant as a direct jump using goto. Is also way better than that awful nested if example - what the heck were they thinking? Who nests conditionals like that LOL.

OR, getting really tricky (slightly faster) [OK I'll stop now I promise]
Code:
/* string_list.h */
#define STRING_LIST_LENGTH 5
typedef struct tagSTRING_LIST
{
        union 
        {
                struct
                {
                        char* string1;
                        char* string2;
                        char* string3;
                        char* string4;
                        char* string5;
                };
                char* strings[STRING_LIST_LENGTH];
        };
} STRING_LIST, *PSTRING_LIST;


int init_string_list( PSTRING_LIST list, size_t num, size_t size )
{
        int i;
        for ( i = 0; i < STRING_LIST_LENGTH; ++i )
        {
                list->strings[i] = ( char* ) calloc( num, size );

                if ( !list->strings[i] )
                {
                        free(list->strings[i]);
                        return false;
                }
        }

        return true;
}
/* end string_list.h */

/* main program */
void structureAllocExample()
{
        STRING_LIST list;
        if ( init_string_list( &list, STRING_MAX, sizeof(char) ) )
        {
                /* important code goes here */
        }
}
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post #223 of 263
Quote:
Originally Posted by tompsonn View Post

For the record, the "non-nested IF example":

Beats the hell out of goto (readability), but not quite as performant as a direct jump using goto. Is also way better than that awful nested if example - what the heck were they thinking? Who nests conditionals like that LOL.
OR, getting really tricky (slightly faster) [OK I'll stop now I promise]
Once you tried to increase performance just a little, the readability went out the window compared to the goto. I have a certain dislike for goto, but I think that goto really does win here.
post #224 of 263
Quote:
Originally Posted by hajile View Post

Once you tried to increase performance just a little, the readability went out the window compared to the goto. I have a certain dislike for goto, but I think that goto really does win here.

Well, not really because most of the code gets stashed away in some header file never to be seen again tongue.gif
But nobody would do it that way anyway, I'm just being a smart ass! wink.gif

I prefer either goto or my first method.
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post #225 of 263
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post #226 of 263
Quote:
Originally Posted by Chris++ View Post

Friday? frown.gif

{Unregistered} time dude tongue.gif
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post #227 of 263
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post #228 of 263
Thread Starter 
Quote:
Originally Posted by Chris++ View Post

Friday? frown.gif

Soon. Okay, tomorrow. thumb.gif
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post #229 of 263
Quote:
Originally Posted by {Unregistered} View Post

Soon. Okay, tomorrow. thumb.gif

wheee.gif
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post #230 of 263
I'm pretty sure this does the same thing as the original code. Breaks out each function using structure - uses a break statement to bail out of a loop when the state of the program changes:
Code:
#include <stdlib.h>
#define STRING_MAX 10

int main() {
    int allAllocatedOK = 1;
        int i;
        char *string1, *string2, *string3, *string4, *string5;
        char* strings[5] = {string1, string2, string3, string4, string5};

        /* Allocate strings */
        for (i=0; i<5; i++) {
                if ( !(strings[i] = (char*) calloc(STRING_MAX, sizeof(char))) ) {
                        allAllocatedOK = 0;
                        break;
                }
        }

        if (allAllocatedOK ) {
                /* Important code */
               /* Edit - added code so that original variable names could be used here */
        }

    /* use cascading feature of c switch to free allocated strings */
    switch (i) {
        default: 
            free(strings[3]);
        case 3:
            free(strings[2]);
        case 2:
            free(strings[1]);
        case 1:
            free(strings[0]);
        case 0:
    }
    return 0;
}

Edited by rrrhal - 10/14/12 at 10:20am
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