Transmission d'une valeur d'une variable locale ?
La fonction ci-dessous ne présente aucune erreur lors de la compilation, mais je n'ai pas compris la transmission de la valeur du pointeur "r" (variable locale) à travers les appels de la fonction create_node().
Code:
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#include<stdio.h>
#include<stdlib.h>
#include<math.h>
// Node structure containing power and coefficient of variable
typedef struct Node {
int coeff;
int pow;
struct Node* next;
} Node;
//A) Function to create new node
void create_node(int x, int y, Node** temp)
{
Node *r, *z;
z = *temp;
if (z == NULL)
{
r = (Node*)malloc(sizeof(struct Node));
r->coeff = x;
r->pow = y;
*temp = r;
r->next = (Node*)malloc(sizeof(struct Node));
r = r->next;
r->next = NULL;
}
else
{
r->coeff = x;
r->pow = y;
r->next = (Node*)malloc(sizeof(Node));
r = r->next;
r->next = NULL;
}
}
//B) Display Linked list
void show(Node* node)
{
while (node->next != NULL) {
printf("%dx^%d", node->coeff, node->pow);
node = node->next;
if (node->coeff >= 0) {
if (node->next != NULL)
printf("+");
}
}
}
int main()
{
struct Node *poly1 = NULL, *poly2 = NULL, *poly = NULL;
// Create first list of 15x^3 + x^2 - 6x^1+ 10x^0
create_node(-15, 3, &poly1);
create_node(1, 2, &poly1);
create_node(-6, 1, &poly1);
create_node(10, 0, &poly1);
printf("\n Le Polynome : ");
show(poly1);
return 0;
} |
Merci pour votre aide.
