init projet

tp1/Sources-TD1/Exercice3.c

@@ -0,0 +1,55 @@
+#include <stdio.h>
+
+void echange_1(int x, int y) {
+  int tmp;
+
+  tmp = x;
+  x   = y;
+  y   = tmp;
+}
+
+void echange_2(int *x, int *y) {
+  int *tmp;
+
+  tmp = x;
+  x   = y;
+  y   = tmp;
+}
+
+void echange_3(int *x, int *y) {
+  int tmp;
+
+  tmp = *x;
+  *x  = *y;
+  *y  = tmp;
+}
+
+void echange_4(int *x, int *y) {
+  int *tmp;
+
+  *tmp = *x;
+  *x   = *y;
+  *y   = *tmp;
+}
+
+// Expliquer de façon détaillée et justifiée ce qu'on obtient à l'exécution.
+
+int main(void) {
+  int a = 1, b = 2;
+  echange_1(a, b);
+  printf("a = %d, b = %d\n", a, b);
+
+  a = 1, b = 2;
+  echange_2(&a, &b);
+  printf("a = %d, b = %d\n", a, b);
+
+  a = 1, b = 2;
+  echange_3(&a, &b);
+  printf("a = %d, b = %d\n", a, b);
+
+  a = 1, b = 2;
+  echange_4(&a, &b);
+  printf("a = %d, b = %d\n", a, b);
+
+  return 0;
+}