Frustratingly strange error that I cannot figure out trying to make a snake game. | Together C & C++ | Page 1

foggy daggerBOT Mar 23, 2023, 11:19 AM

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valid hamlet Mar 23, 2023, 11:20 AM

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void initialise_map(enum land map[SIZE][SIZE]) {
    for (int row = 0; row < SIZE; ++row) {
        for (int col = 0; col < SIZE; ++col) {
            map[row][col] = NOT_VISITED;
        }
    }
}

void print_map(enum land map[SIZE][SIZE]) {
    for (int row = 0; row < SIZE; ++row) {
        for (int col = 0; col < SIZE; ++col) {
            if (map[row][col] == NOT_VISITED) {
                printf(". ");
            } else if (map[row][col] == VISITED) {
                printf("- ");
            } else if (map[row][col] == SNAKE) {
                printf("S ");
            } else if (map[row][col] == APPLE) {
                printf("A ");
            }
        }
        printf("\n");
    }
}```

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if you " combine" that code into one file essentially then thats my program

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max char limit is fucking annoying

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anyways

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hopefully what its inteded to do should be somewhat understandabkle

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but im getting the strangest behavouir and for the life of me i cannot figure out why

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Please enter apple location: 2 3
Please enter snake location: 4 5
. . . . . . . . 
. . . . . . . . 
. . . A . . . . 
. . . . . . . . 
. . . . . S . . 
. . . . . . . . 
. . . . . . . . 
. . . . . . . . 
r
. . . . . . . . 
. . . . . . . . 
. . . A . . . . 
. . . . . . . . 
. . . . . S . . 
. . . . . . . . 
. . . . . . . . 
. . . . . . . . 
d
. . . . . . . . 
. . . . . . . . 
. . . A . . . . 
. . . . . . . . 
. . . . . - S . 
. . . . . . . . 
. . . . . . . . 
. . . . . . . . 
d
. . . . . . . . 
. . . . . . . . 
. . . A . . . . 
. . . . . . . . 
. . . . . - - . 
. . . . . . S . 
. . . . . . . . 
. . . . . . . . 
l
. . . . . . . . 
. . . . . . . . 
. . . A . . . . 
. . . . . . . . 
. . . . . - - . 
. . . . . . - . 
. . . . . . S . 
. . . . . . . . 
l
. . . . . . . . 
. . . . . . . . 
. . . A . . . . 
. . . . . . . . 
. . . . . - - . 
. . . . . . - . 
. . . . . S - . 
. . . . . . . . 
l
. . . . . . . . 
. . . . . . . . 
. . . A . . . . 
. . . . . . . . 
. . . . . - - . 
. . . . . . - . 
. . . . S - - . 
. . . . . . . . 
l
. . . . . . . . 
. . . . . . . . 
. . . A . . . . 
. . . . . . . . 
. . . . . - - . 
. . . . . . - . 
. . . S - - - . 
. . . . . . . . 
d
. . . . . . . . 
. . . . . . . . 
. . . A . . . . 
. . . . . . . . 
. . . . . - - . 
. . . . . . - . 
. . S - - - - . 
. . . . . . . . 
u
. . . . . . . . 
. . . . . . . . 
. . . A . . . . 
. . . . . . . . 
. . . . . - - . 
. . . . . . - . 
. . - - - - - . 
. . S . . . . . ```

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the snake only moves

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upon inputting a SECOND character

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regardless of what the character

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but i have no fuycking idea why

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this is sooooooooooooooooooo fucking strange lmao

ember thicket Mar 23, 2023, 11:26 AM

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Don't do scanf("%c ") but rather do scanf(" %c")

valid hamlet Mar 23, 2023, 11:26 AM

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whats the difference?

ember thicket Mar 23, 2023, 11:29 AM

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The first expects a character and a whitespace (I think), the second ignores any whitespace (including newlines which is where I think the error stems from).
I do have to admit that I don't really know the difference for sure but yeah, you shouldn't ever use scanf in the first place: https://sekrit.de/webdocs/c/beginners-guide-away-from-scanf.html

valid hamlet Mar 23, 2023, 11:29 AM

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ahhhhh i see

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could i have used

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fgets

ember thicket Mar 23, 2023, 11:29 AM

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Yes

valid hamlet Mar 23, 2023, 11:29 AM

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i wasnt really sure how to

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for example like

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lets say the grid was bigger like 12x12

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and i inputted 12 12

ember thicket Mar 23, 2023, 11:30 AM

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Yeah?

valid hamlet Mar 23, 2023, 11:31 AM

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i would get smth like c {'1', '2', ' ', '1', '2', '\n', '\0'} right @dire sand

ember thicket Mar 23, 2023, 11:31 AM

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Yes

valid hamlet Mar 23, 2023, 11:31 AM

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then how would i like

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get those numbers "added" together im not really sure how to word it

ember thicket Mar 23, 2023, 11:32 AM

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You can remove any possibly trailing newline from a string s by doing:

s[strcspn(s, "\n")] = 0;

valid hamlet Mar 23, 2023, 11:32 AM

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like the digits connected into an integer

ember thicket Mar 23, 2023, 11:33 AM

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valid hamlet like the digits connected into an integer

You can either do that manually but I personally would just use strtol

valid hamlet Mar 23, 2023, 11:33 AM

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if i were to do it manually?

ember thicket Mar 23, 2023, 11:33 AM

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!man strtol

foggy daggerBOT Mar 23, 2023, 11:33 AM

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man7

strtol(3)

strtol, strtoll, strtoq - convert a string to a long integer

Synopsis

#include <stdlib.h>

long strtol(const char *restrict nptr,
            char **restrict endptr, int base);
long long strtoll(const char *restrict nptr,
            char **restrict endptr, int base);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

strtoll():
    _ISOC99_SOURCE
        || /* Glibc <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE

valid hamlet Mar 23, 2023, 11:33 AM

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as my uni course has not really

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explained anything 💀

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like if i were to do it with a while loop or smth

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the only string function we did was strcopy

ember thicket Mar 23, 2023, 11:34 AM

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valid hamlet if i were to do it manually?

Does your code work with scanf(" %c") btw?

valid hamlet Mar 23, 2023, 11:35 AM

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it does 🙂

ember thicket Mar 23, 2023, 11:35 AM

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Yeah, then just don't worry about it

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Never change a running system

valid hamlet Mar 23, 2023, 12:46 PM

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!solved

foggy daggerBOT Mar 23, 2023, 12:46 PM

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Thank you and let us know if you have any more questions!

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#Frustratingly strange error that I cannot figure out trying to make a snake game.