C snippet for mabe

prout.c

@@ -0,0 +1,70 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+struct structure {
+    int a;
+    int b;
+};
+
+struct structure_mixte {
+    char a;
+    int b;
+};
+
+int main(){
+    // simple
+    int val = 15;
+    int* ad = &val;
+    *ad = 16;
+    printf("%d\n", val);
+
+    // structures
+    printf("taille : %d\n", sizeof(struct structure));
+    struct structure* s = malloc(sizeof(struct structure));
+    s->a = 17;
+    s->b = 18;
+    ad   = (int*) s;
+    printf(" ad %d\n", *ad);
+    ad = ad + 1;
+    printf("ad +1 %d\n", *ad);
+
+    // structures mixtes
+    printf("taille : %d\n", sizeof(struct structure_mixte));
+    struct structure_mixte* m = malloc(sizeof(struct structure_mixte));
+    m->a = 'a';
+    m->b = 19;
+    ad   = (char*) m;
+    printf("ad %c\n", *(char*)ad);
+    ad = (char*) ad + 1;
+    printf("ad +1 %d\n", *ad);
+    ad = (char*) ad + 3;
+    printf("ad +3 %d\n", *ad);
+    ad = (int*) m;
+    *ad = 20;
+    printf("%d\n", *ad);
+
+    // Jouer avec les adresses
+    int* a = malloc(4);
+    *a = 1;
+    int* b = &a;
+    **( int** ) b = 2;
+    printf("%d\n", *a);
+    free(( void* ) * ( void** ) b);
+
+    // comprendre les tableaux
+    a = malloc(8);
+    *a = 5;
+    b = a + 1;
+    *b = 6;
+    printf("%d\n", *a);
+    printf("%d\n", *b);
+
+    // comprendre le déférencement
+    char *c = (char*) a + 1;
+    *c = 'a';
+    printf("%d\n", *a);
+    printf("%c\n", *c);
+    *a = 5;
+    printf("%d\n", *a);
+    free(a);
+}