diff --git a/TP3/E8.c b/TP3/E8.c
new file mode 100644
index 0000000..9fe74bc
--- /dev/null
+++ b/TP3/E8.c
@@ -0,0 +1,47 @@
+/* Mise en majuscules / minuscules */
+
+#include <stdio.h>
+
+#define N 255
+
+int length(char* c) {
+    int i, len = -1;
+    for (i = 0; i < N; i++) {
+        if (c[i] == '\0') {
+            len = i;
+            break;
+        }
+    }
+    return len;
+}
+
+void majuscule(char* c) {
+    int i, len = length(c);
+    for (i = 0; i < len; i++) {
+        if ('a' <= c[i] && c[i] <= 'z') {
+            c[i] += 'A' - 'a';
+        }
+    }
+
+}
+
+void minuscule(char* c) {
+    int i, len = length(c);
+    for (i = 0; i < len; i++) {
+        if ('A' <= c[i] && c[i] <= 'Z') {
+            c[i] += 'a' - 'A';
+        }
+    }
+
+}
+
+int main() {
+    char c[N];
+    printf("Entrez du texte : ");
+    scanf("%s", &c);
+    majuscule(c);
+    printf("Majuscules : %s (addresse : 0x%x)\n", c, &c);
+    minuscule(c);
+    printf("Minuscules : %s (addresse : 0x%x)\n", c, &c);
+    return 0;
+}