diff --git a/SCR/SCR3.1/TP03/Exercise1/answer.txt b/SCR/SCR3.1/TP03/Exercise1/answer.txt
new file mode 100644
index 0000000..f1e8899
--- /dev/null
+++ b/SCR/SCR3.1/TP03/Exercise1/answer.txt
@@ -0,0 +1,10 @@
+  PID    PPID COMMAND         S
+   4331    1423 bash            S
+   4732    4331  \_ a.out       S
+   4733    4732      \_ a.out   S
+   4736    4733      |   \_ a.o S
+   4737    4733      |   \_ a.o S
+   4734    4732      \_ a.out   S
+   4735    4732      \_ a.out   S
+
+-> Il y aura donc 6 appels à a.out.
diff --git a/SCR/SCR3.1/TP03/Exercise1/main.c b/SCR/SCR3.1/TP03/Exercise1/main.c
new file mode 100644
index 0000000..7b6bb58
--- /dev/null
+++ b/SCR/SCR3.1/TP03/Exercise1/main.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <stdlib.h>
+# include <sys/types.h>
+# include <unistd.h>
+
+int main() {
+	fork();
+
+	if (fork()){
+		fork();
+	}
+
+	printf("A\n");
+
+    sleep(20);
+}
diff --git a/SCR/SCR3.1/TP03/Exercise2/answer.txt b/SCR/SCR3.1/TP03/Exercise2/answer.txt
new file mode 100644
index 0000000..59c5814
--- /dev/null
+++ b/SCR/SCR3.1/TP03/Exercise2/answer.txt
@@ -0,0 +1,6 @@
+[baudrier@salle229-06 Exercise2]$ gcc ex1-stdio.c 
+[baudrier@salle229-06 Exercise2]$ ./a.out
+NONOUI
+NON[baudrier@salle229-06 Exercise2]$ gcc ex1-syscall.c 
+[baudrier@salle229-06 Exercise2]$ ./a.out
+NONOUI
\ No newline at end of file
diff --git a/SCR/SCR3.1/TP03/Exercise2/ex1-stdio.c b/SCR/SCR3.1/TP03/Exercise2/ex1-stdio.c
new file mode 100644
index 0000000..4bc5de2
--- /dev/null
+++ b/SCR/SCR3.1/TP03/Exercise2/ex1-stdio.c
@@ -0,0 +1,12 @@
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+
+
+int main(){
+
+	printf("NON");
+	if (fork()) {
+		printf("OUI\n");
+	}
+}
diff --git a/SCR/SCR3.1/TP03/Exercise2/ex1-syscall.c b/SCR/SCR3.1/TP03/Exercise2/ex1-syscall.c
new file mode 100644
index 0000000..1b46b6a
--- /dev/null
+++ b/SCR/SCR3.1/TP03/Exercise2/ex1-syscall.c
@@ -0,0 +1,14 @@
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+
+
+int main(){
+
+	//printf("NON");
+	write(STDOUT_FILENO,"NON",3);
+	if (fork()) {
+		//printf("OUI\n");
+	write(STDOUT_FILENO,"OUI\n",4);
+	}
+}
diff --git a/SCR/SCR3.1/TP03/Exercise3/answer.txt b/SCR/SCR3.1/TP03/Exercise3/answer.txt
new file mode 100644
index 0000000..8cb89f0
--- /dev/null
+++ b/SCR/SCR3.1/TP03/Exercise3/answer.txt
@@ -0,0 +1,15 @@
+-> Le code de cet exercice permet de copier le contenu d'un fichier dans un autre fichier.
+
+-> Quand on décommente le fork(), il y a des entrelacements possibles duent à l'exécution simultanée des processus.
+
+Lecture Père = LP
+Ecriture Père = EP
+
+Lecture Fils = LF
+Ecriture Fils = EF
+
+Il y a plusieurs combinaisons possibles qui peuvent arriver : 
+
+- LP (a) -> LF (b) -> EF (b) -> EP (a)
+- LP (a) -> EP (a) -> LF (b) -> EF (b)
+- etc...
\ No newline at end of file
diff --git a/SCR/SCR3.1/TP03/Exercise3/copy1byte.c b/SCR/SCR3.1/TP03/Exercise3/copy1byte.c
new file mode 100644
index 0000000..fab6100
--- /dev/null
+++ b/SCR/SCR3.1/TP03/Exercise3/copy1byte.c
@@ -0,0 +1,45 @@
+#include <sys/types.h>
+#include <unistd.h>
+#include<stdio.h>
+#include <stdlib.h>
+#include<assert.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+
+#define msg1 "je suis le pere"
+#define msg2 "je suis le fils !!!"
+
+int main(int argc,char * argv[]){
+
+	int infd,outfd;
+	ssize_t nbread;
+	char buf[1];
+	pid_t p;
+
+	if (argc != 3){
+
+		printf("%s infile outfile\n",argv[0]);
+		exit(1);
+	}
+
+	infd = open(argv[1],O_RDONLY);
+	assert(infd >= 0);
+	outfd = open(argv[2],O_WRONLY|O_CREAT|O_TRUNC,0644);
+	assert(outfd >= 0);
+
+	p=fork(); // <- decommentez cette ligne
+
+	while(1){
+	
+	nbread=read(infd,buf,sizeof(buf));
+	if (nbread <=0 ) break;
+	write(outfd,buf,sizeof(buf));
+
+	}
+
+
+	close(infd);
+	close(outfd);
+}
diff --git a/SCR/SCR3.1/TP03/Exercise3/test b/SCR/SCR3.1/TP03/Exercise3/test
new file mode 100644
index 0000000..97fea1e
--- /dev/null
+++ b/SCR/SCR3.1/TP03/Exercise3/test
@@ -0,0 +1 @@
+je m'appelle nathan
\ No newline at end of file
diff --git a/SCR/SCR3.1/TP03/Exercise3/testdetest b/SCR/SCR3.1/TP03/Exercise3/testdetest
new file mode 100644
index 0000000..9e2e36b
--- /dev/null
+++ b/SCR/SCR3.1/TP03/Exercise3/testdetest
@@ -0,0 +1 @@
+je map'pelle nathan
\ No newline at end of file
diff --git a/SCR/SCR3.1/TP03/Exercise4/rebours.c b/SCR/SCR3.1/TP03/Exercise4/rebours.c
new file mode 100644
index 0000000..fd16bbe
--- /dev/null
+++ b/SCR/SCR3.1/TP03/Exercise4/rebours.c
@@ -0,0 +1,12 @@
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+int main(int argc, char* argv[]) {
+	assert(argc == 2);
+
+    long i = strtol(argv[1], NULL, 10);
+
+	return EXIT_SUCCESS;
+}