How to store strings in a 2D array in C?

Question

I want to store strings in a char * array but I don't know how I can do that. Each cell in the 2d array can contain letters or numbers with 2 digits.

|_|S|_|
|_|10|_|
|_|W|_|
|_|_|_|
|_|_|_|

I tried this, I used struct:

struct Etage {
    char Idsalles[20];
    int** etage;
    int width;
    int height;
}; 


#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include "etage.h"

#define COLS 15
#define ROWS 9

Etage *createMap()
{
    Etage *e = malloc(sizeof(Etage));
    e->width = COLS;  // columns
    e->height = ROWS; // rows
    e->etage = malloc(sizeof(char *) * e->height);

    for (int i = 0; i < e->height; i += 1)
    {
        e->etage[i] = malloc(sizeof(char) * e->width);
        for (int j = 0; j < e->width; j += 1)
        {
            e->etage[i][j] = "0";
        }
    }

    return e;
}

void randomId(Etage *e, int maxSalles)
{
    srand(time(NULL));
    int i = 0;

    if (maxSalles < 10)
    {
        printf("Seulement %d disponibles, veuiller générer plus de salles.\n", maxSalles);
        return;
    }

    while (i < 10)
    {
        int id = (rand() % maxSalles) + 1; 
        int existe = testId(e, id);
        if (existe != 1)
        {
            e->Idsalles[i] = id;
            i += 1;
        }
    }
    
    return;
}

int testId(Etage *e, int id)
{
    for (int i = 0; i < 10; i += 1)
    {
        if (id == e->Idsalles[i])
        {
            return 1;
        }
    }
    return 0;
}

void printEtage(Etage *e)
{
    for (int i = 0; i < e->height; i += 1)
    {
        for (int j = 0; j < e->width; j += 1)
        {
            if(e->etage[i][j] == 0){
                printf("  ");
            }else{
                printf("%s", e->etage[i][j]);
                printf(" ");
            }
        }
        printf("\n");
    }

    printf("Id des salles de cette étage: ");
    for(int i =0; i <10;i+=1){
        printf("%d ",e->Idsalles[i]);
    }
    printf("\n");
}

void freeEtage(Etage *e)
{
    //free(e->etage);
    free(e);
}

void placerSalles(Etage* e){
    int a=ROWS/2;
    int b=COLS/2;
    //0 = Haut; 1 = Droite; 2 = Bas; 3 = Gauche
    e->etage[a][b] = e->Idsalles[0]+"\0";    // On place la premiere salle au centre de l'étage sa sera le spawner 'S'
    srand(time(NULL));
    int i = 1;
    while(i<10){
        int dir  = randomDirections();

        if(dir==0){ // On se déplace en haut
            a = a-1;    //On se déplace
            if(e->etage[a][b] == 0 && a > 0){
                e->etage[a][b] = e->Idsalles[i]+"\0";
                i+=1;
            }else{
              a = a+1;  // Sionon on revien a la derniere case connu
            }
        }else if(dir==1){   // On se déplace à droite
            b=b+1;
            if(e->etage[a][b] == 0 && b< e->width){
                e->etage[a][b] = e->Idsalles[i]+"\0";
                i+=1;
            }else{
                b = b-1;
            }
        }else if(dir==2){ // On se déplace en bas
            a = a+1;
            if(e->etage[a][b] == 0 && a>e->height){
                e->etage[a][b] = e->Idsalles[i]+"\0";
                i+=1;
            }else{
                a = a-1;
            }
        }else if(dir==3){ // On se déplace à gauche
            b = b-1;
            if(e->etage[a][b] == 0 && b>0){
                e->etage[a][b] = e->Idsalles[i]+"\0";
                i+=1;
            }else{
                b = b+1;
            }
        }
    }
}

int randomDirections(){
    int i = 0;
    int id = rand() % 4; // Remplacé 10 par le nbrSalles
    //printf("Position: %d\n",id);
    return id;
}

I have a good understanding with 2d array but three...

I tried using malloc.

I don't even think this is possible...

const char* array[x][y] = { {" ", "10", "blah", ...}, { "more", "strings", "here" } };. If you need them to be writable then 2 for loops and assign using strdup or similar. — Lundin
– Lundin, Commented Nov 25, 2022 at 14:01
As far as I understand the question, there's no special trick involved in doing what you ask. As such, I'm a bit at a loss as to how to answer. If you have attempted to write the needed code, then presenting your attempt might help us understand the nature of your uncertainty. If you have not made such an attempt, then why not? — John Bollinger
– John Bollinger, Commented Nov 25, 2022 at 14:26
@JohnBollinger There is what i've done. Thank you for your help — Jonathan
– Jonathan, Commented Nov 25, 2022 at 14:34
@0___________ "How to store strings in an array 2d in c" It's not a 3D array of characters either, apparently. — Lundin
– Lundin, Commented Nov 25, 2022 at 14:39

Jonathan Leffler · Accepted Answer · 2022-11-25 14:59:17Z

2

If your string is a maximum of 2 characters long (your strings will be 3 chars long)

char array[rows][cols][3] = {{"2", "a", "34"}, ... };

or to use malloc

char (*array)[cols][3] = malloc(rows * sizeof(*array));

edited Nov 25, 2022 at 14:59

Jonathan Leffler

759k145 gold badges961 silver badges1.3k bronze badges

answered Nov 25, 2022 at 14:34

0___________

71.6k4 gold badges41 silver badges94 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

How to store strings in a 2D array in C?

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related