Plz ,i need help .This void does not work well whether it is present or not. Outputs are not

Question

void rechercher(int code){
int d=0;
printf("Entrez le code du client que vous recherchez\n");
scanf("%d",&code);
FILE*F;
F=fopen("client.txt","r");
do {
fscanf(F,"%d%s%s%s%d%d%d%s",&c1.id,&c1.nom,&c1.prenom,&c1.adresse,&c1.date.jour,&c1.date.mois,&c1.date.annee,&c1.tel);
if(code==c1.id){
printf("il existe");
printf("id=%d\nnom=%s\nprenom=%s\nadresse=%s\n la date_nais:%d/%d/%d\ntel:%s"
,c1.id,c1.nom,c1.prenom,c1.adresse,c1.date.jour,c1.date.mois,c1.date.annee,c1.tel);
}
else
printf("il n'existe pas");
}
while(!feof(F));
fclose(F);
}

Answer 1

You are receiving code from the client even when you have received it from calling statement.
It will give an error of multiple declaration.