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--- programming:c:hello_world [2013/08/05 15:26] – zufd
+++ programming:c:hello_world [2014/12/11 16:10] – czuber
@@ Line 1: / Line 1: @@
 ====== Hello world ! ======
-===== Exercice 1 =====
+===== Exercice 1 : printf =====
   * Open a terminal
@@ Line 26: / Line 26: @@
 </code>
   * Then run your programm by typing "./ex1" in the terminal
+===== Exercice 2 =====
+  * Open a terminal
+  * Copy the content of the first exercice to the second by writing the following command
+<code>
+cp ex1.c ex2.c
+</code>
+  * Open ex2.c with vim
+<code>
+vim ex2.c
+</code>
+  * Edit your file so it looks like this :
+<code c>
+#include <stdio.h>
+int main(){
+#ifdef DEBUG
+	printf("Hello world !\n");
+#endif
+	return 0 ;
+}
+</code>
+  * Compile your code with gcc
+<code>
+gcc -Wall ex2.c -o ex2
+</code>
+  * Run it with "./ex2"
+  * Nothing should happen, it's normal because you didn't tell the compiler to use preprocessor parts. Which are defined by the #ifdef #endif quotes
+  * now recompile your program with the following line
+<code>
+gcc -Wall -DDEBUG ex2.c -o ex2
+</code>
+  * Run it again
+  * Hello world !
+===== Exercice 3 : scanf =====
+  * Open a terminal
+  * Create your file by writing the following command
+<code c>
+vim ex3.c
+</code>
+  * Enter insertion mode by pressing Insert
+  * Write the lines below
+<code c>
+#include<stdio.h>
+int main(int argc, char** argv)
+{
+    char nom[14];
+    printf("Salut\nComment t'appelles-tu ?\n");
+    scanf("%s", nom);
+    printf("Salut %s\n", nom);
+    return 0;
+}
+</code>
+  * Then press Esc key
+  * Write :wq
+  * Compile your code with the following line
+<code>
+gcc -Wall ex3.c -o ex3
+</code>
+  * Then run your programm by typing "./ex3" in the terminal
+===== Exercice 4 : for =====
+  * Open a terminal
+  * Create your file by writing the following command
+<code c>
+vim ex4.c
+</code>
+  * Enter insertion mode by pressing Insert
+  * Write the lines below
+<code c>
+#include<stdio.h>
+int main(int argc, char** argv)
+{
+    int nbrMax;
+    int i = 1;
+    printf("Salut\nEntre un nombre\n");
+    scanf("%d", &nbrMax);
+    printf("Affichage de nombres de 1 à %d\n", nbrMax);
+    for(i=1;i<=nbrMax;i++)
+    {
+        printf("%d\n", i);
+    }
+    return 0;
+}
+</code>
+  * Then press Esc key
+  * Write :wq
+  * Compile your code with the following line
+<code>
+gcc -Wall ex4.c -o ex4
+</code>
+  * Then run your programm by typing "./ex4" in the terminal