Added 'repetition of calc.' of question 4.

simmod/ass1/extra_precision.c

@@ -10,10 +10,15 @@ int fact(int x) {return x > 0 ? x * fact(x-1) : 1; }
 
 int main(void) {
     printf("fact 8: %d\n", fact(8));
-    float e = 1;
-    for(int i = 1; i < 20; i++ ) {
-        e += 1.f / fact(i);
+    float first, e;
+    for(int r = 0; r < 2; r++ ) {
+        e = 1;
+        for(int i = 1; i < 20; i++ ) {
+            e += 1.f / fact(i);
+        }
+        printf("approx. e: %.80f\n", e);
+        first = e;
     }
-    printf("approx. e: %.80f\n", e);
+    printf("diff: %.80f = (first - e)\n", first - e);
     return 0;
 }