From 013653ff22eaf9e4a31207883e3752c4ea12bcb8 Mon Sep 17 00:00:00 2001
From: Orestis <orestis.malaspinas@pm.me>
Date: Tue, 23 Nov 2021 23:35:26 +0100
Subject: [PATCH] corrected slide 42,
---
slides/cours_9.md | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
diff --git a/slides/cours_9.md b/slides/cours_9.md
index d46856b..4e83cd7 100644
--- a/slides/cours_9.md
+++ b/slides/cours_9.md
@@ -439,7 +439,8 @@ char *infix_to_postfix(char* infix) { // init and alloc stack and postfix
for (size_t i = 0; i < strlen(infix); ++i) {
if (is_operand(infix[i])) {
// we just add operands in the new postfix string
- } else if (infix[i] == '(') { // we push opening parenthesis into the stack
+ } else if (infix[i] == '(') {
+ // we push opening parenthesis into the stack
stack_push(&s, infix[i]);
} else if (infix[i] == ')') {
// we pop everything into the postfix
@@ -537,8 +538,8 @@ typedef element* stack;
stack stack_create(); // return NULL;
void stack_destroy(stack *s);
void stack_push(stack *s, int val);
-int stack_pop(stack *s);
-int stack_peek(stack s);
+void stack_pop(stack *s, int *val);
+void stack_peek(stack s, int *val);
bool stack_is_empty(stack s); // reutrn NULL == stack;
```
@@ -592,8 +593,8 @@ void stack_push(stack *s, int val) {
. . .
```C
-int stack_peek(stack s) {
- return s->data;
+void stack_peek(stack s, int *val) {
+ *val = s->data;
}
```
@@ -618,8 +619,8 @@ int stack_peek(stack s) {
. . .
```C
-int stack_pop(stack *s) {
- int val = stack_peek(*s);
+void stack_pop(stack *s, int *val) {
+ stack_peek(*s, val);
element *tmp = *s;
*s = (*s)->next;
free(tmp);
--
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