Initialize values in array of structure in C

Question

I want to create a function to initialize values of structure like that :

// main.c
#include <stdio.h>
#include <stdlib.h>
#include "main.h"

int main(int argc, char *argv[]){
    int i, taille = 2, cmpt = 0;
    Personne joueur[2];

    for(i = 0; i < taille; i++){
        initialiserJoueur(&joueur[i]);
    }

    printf("\n%s %s : %d\n", joueur[0].nom,joueur[0].prenom, joueur[0].age);

    return 0;
}

void initialiserJoueur(Personne *joueur){
    joueur->age = 0;
    joueur->nom = "";
    joueur->prenom = "";
}

// main.h
typedef struct Personne Personne;

struct Personne {
    int age;
    char nom[100];
    char prenom[100];
};

void initialiserJoueur(Personne *joueur);

in function "initialiserJoueur", the fields "nom" and "prenom" won't initialize and are red underline, an idea ?

There's perhaps an error message coming along with the red underlining — Cid
– Cid, Commented Nov 27, 2021 at 16:04
Hello, yes "The expression must be a changeable value" Personne *joueur — B. Christophe
– B. Christophe, Commented Nov 27, 2021 at 16:06

dbush · Accepted Answer · 2021-11-27 16:05:08Z

1

Arrays can't be assigned to directly. You need to use strcpy to write to one:

joueur->nom = strcpy("");
joueur->prenom = strcpy("");

Or even simpler, since you're setting all fields to 0, just initialize the array that way:

Personne joueur[2] = { { 0 } };

answered Nov 27, 2021 at 16:05

dbush

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5 Comments

Rodney Over a year ago

More specifically a string literal in C is a pointer, so char str[80] = "text"; is not valid - I hope someone can expand on this I have got to dash out right now.

B. Christophe Over a year ago

Thanks for your answer, if i initialize with 0 value, the strings types will at blank ?

dbush Over a year ago

@B.Christophe Yes, the char arrays will be initialized with all bytes 0.

dbush Over a year ago

@Rodney That's valid because it's an initializer. char str[80]; str = "text"; is not valid.

Rodney Over a year ago

@dbush Thanks for the correction - I confirmed you are right with my compiler.

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