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.dsy:it. : Powered by vBulletin version 2.3.1 .dsy:it. > Didattica > Corsi A - F > Algoritmi e strutture dati > Chiarimento su riempimento e stampa vettore
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albakiara
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Chiarimento su riempimento e stampa vettore

Ciao a tutti! :)
Vorrei riempire un vettore con numeri casuali e stamparlo! Solo che difficoltà a capire dove sbaglio...

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define N 100

void riempi_array (int a[], int n);
void stampa_array (int a[], int n);

int main (void) {
int a[N] = {0}, n;
printf ("Inserisci n\n");
scanf ("%d", &n);
riempi_array (a, n);
stampa_array (a, n);
return 0;
}

void riempi_array (int a[], int n) {
int* p;
for (p = a; p< a+n; p++) {
srand (time(NULL));
*p = rand() % 99+1; //assegno al contenuto di numeri compresi tra 0 e 99
}
}

void stampa_array (int a[], int n) {
int* p;
printf ("vettore: ");
for (p = a; p< a+n; p++)
printf ("%d ",*p);
printf ("\n");
}

Grazie :shock:

17-11-2014 12:14
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mark
.grande:maestro.

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code:
#include <stdio.h> #include <stdlib.h> #include <time.h> #define N 100 void riempi_array (int a[], int n); void stampa_array (int a[], int n); int main (void) { int a[N] = {0}, n; printf ("Inserisci n\n"); scanf ("%d", &n); riempi_array (a, n); stampa_array (a, n); return 0; } void riempi_array (int a[], int n) { int* p; srand (time(NULL)); for (p = a; p< a+n; p++) { *p = rand() % 99+1; //assegno al contenuto di numeri compresi tra 0 e 99 } } void stampa_array (int a[], int n) { int* p; printf ("vettore: "); for (p = a; p< a+n; p++) printf ("%d ",*p); printf ("\n"); }


questa riga di codice --------> srand (time(NULL)); va messa fuori dal ciclo for()

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Non ti perdere di coraggio se ti tocca lavorare molto e raccogliere poco.....

Last edited by mark on 17-11-2014 at 13:25

17-11-2014 13:23
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albakiara
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grazie :)

17-11-2014 14:39
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albakiara
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ne approfitto per chiedere un'altra cosa sui vettori!
ho scritto questo codice per allocare un vettore con n elementi, dove n è inserito da tastiera.appena compilo ottengo 2 warning:

c:13:7: warning: conflicting types for built-in function ‘__builtin_alloca’ [enabled by default]
void *alloca (int n);
^
c:30:7: warning: conflicting types for built-in function ‘__builtin_alloca’ [enabled by default]
void *alloca (int n)
^

code:
int main (void) { int n, *a; //int *p; printf ("Inserisci n\n"); scanf ("%d", &n); a = (int*) alloca (n); free (a); return 0; } void *alloca (int n) { void *a; a = malloc (n * sizeof (int)); if (a == NULL) exit (1); return a; }

17-11-2014 15:43
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Cronovirus
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Cambia nome ad "alloca" e mettila prima del main :) (oltre ad importare le opportune librerie)

Last edited by Cronovirus on 17-11-2014 at 16:19

17-11-2014 16:15
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albakiara
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Ho importato le librerie e scritto il prototipo della funzione, anche se nn le ho scritte nel post. Il problema è solo per il nome, ma come mai? Forse xke avevo già scritto in un altro programma una funzione con lo stesso nome?

17-11-2014 16:56
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Cronovirus
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lancia "man alloca", esiste già! :D

17-11-2014 17:09
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albakiara
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ahahah va bene! grazie come sempre :)

17-11-2014 17:17
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