Add demos for lab01.

Signed-off-by: Gabriel Mocanu <gabi.mocanu98@gmail.com>

laborator/content/reprezentare-numere/demo/pointers/Makefile

@@ -0,0 +1,22 @@
+CC = gcc
+CFLAGS = -Wall
+LDFLAGS =
+
+TARGET_EXEC = pointers
+
+SRCS := $(shell find $(SRC_DIRS) -name "*.c")
+OBJS := $(SRCS:.c=.o)
+
+$(info OBJS is $(OBJS))
+$(info SRCS is $(SRCS))
+
+$(TARGET_EXEC): $(OBJS)
+	$(CC) $(OBJS) -o $@ $(LDFLAGS)
+
+.o: %.c
+	$(CC) $(CFLAGS) $(LDFLAGS) -c $< -o $@
+
+.PHONY: clean
+
+clean:
+	$(RM) -r *.o $(TARGET_EXEC)

laborator/content/reprezentare-numere/demo/pointers/pointers-demo.c

@@ -0,0 +1,28 @@
+/*
+ * Author: Gabriel Mocanu <gabi.mocanu98@gmail.com>
+ */
+
+
+#include <stdio.h>
+
+int main() {
+
+    int var;
+    int *p = (int *) 250;
+
+    printf("p : %p\n", p);
+    printf("p : %p\n", &p);
+    printf("var : %p\n", &var);
+
+    p = &var;
+    printf("p : %p\n", p);
+
+    p = p + 4;
+    printf("p : %p\n", p);
+
+    *p = &var;
+    printf("p : %p\n", &p);
+    printf("var : 0x%08x\n", var);
+
+    return 0;
+}