Update Homework1.c

Homeworks/Homework1.c

@@ -17,9 +17,13 @@ double denominator;
 
     printf("Please enter the enter the stopping value: ");
         scanf("%lf", &B);
-
-    printf("Please enter the number of steps: ");
-        scanf("%lf", &N);
+    do{
+     printf("Please enter the number of steps: ");
+            scanf("%lf", &N);
+            if(N < 0){
+                printf("Please enter a positive number of steps.\n")
+            }
+    }while(N < 0);
         
         H = (B - A) / N;