Tests are done

Author: Ankononenko

For loop/49. Find the sum of an A.P. series.c

@@ -13,7 +13,7 @@ The Sum of the A.P. series are :
 + 1.5 Invalid input
 + 2. Write a function to find elements
 + 3. Output sum
-4. Test
++ 4. Test
 + 5. Cpplint test
 + 6. Add and push
 */
@@ -28,15 +28,19 @@ enum is_valid {
 int input_start(int *start);
 int input_number_of_items(int *number_of_items);
 int input_difference(int *difference);
-void find_and_print_result(int start, int number_of_items, int difference);
+// Changed this function to return int sum for tests
+int print_result_find_sum(int start, int number_of_items, int difference);
 void print_invalid_input();
+void test(int start, int number_of_items, int difference, int expected_sum, int test_number);
+void run_tests();
 
 int main() {
     int start = 0, number_of_items = 0, difference = 0;
+    // Normal run of the programm
     if (input_start(&start)) {
         if (input_number_of_items(&number_of_items)) {
             if (input_difference(&difference)) {
-                find_and_print_result(start, number_of_items, difference);
+                print_result_find_sum(start, number_of_items, difference);
             } else {
                 print_invalid_input();
             }
@@ -46,14 +50,47 @@ int main() {
     } else {
         print_invalid_input();
     }
+    // Test runs
+    printf("\nStart of test runs:\n");
+    run_tests();
     return 0;
 }
 
+void run_tests() {
+// values: int start, int number_of_items, int difference, int expected_sum, int test_number
+// Normal value tests
+    test(1, 10, 4, 190, 1);
+    test(0, 9, 5, 180, 2);
+    test(500, 5, 180, 4300, 3);
+// Negative number tests
+    // Negative start
+    test(-100, 5, 3, -470, 4);
+    // Negative step
+    test(100, 5, -3, 470, 5);
+    // Negative start and step
+    test(-100, 5, -3, -530, 6);
+// Big numbers
+    test(67548, 50, 4543, 8942575, 7);
+    // Almost the end of int range
+    test(63437548, 33, 54543, 2122237788, 8);
+}
+
+void test(int start, int number_of_items, int difference, int expected_sum, int test_number) {
+    int actual_sum = 0;
+    actual_sum = print_result_find_sum(start, number_of_items, difference);
+    if (expected_sum == actual_sum) {
+        printf("Success\n");
+    } else {
+        printf("Failed\nTest #%d: start = %d, number_of_items = %d, difference = %d, expected_sum = %d, actual_sum = %d\n",
+        test_number, start, number_of_items, difference, expected_sum, actual_sum);
+    }
+}
+
 void print_invalid_input() {
     printf("n/a");
 }
 
-void find_and_print_result(int start, int number_of_items, int difference) {
+int print_result_find_sum(int start, int number_of_items, int difference) {
     printf("The Sum of the A.P. series are:\n");
     int sum = start, element = start;
     printf("%d ", element);
@@ -62,7 +99,8 @@ void find_and_print_result(int start, int number_of_items, int difference) {
         printf("+ %d ", element);
         sum += element;
     }
-    printf("= %d", sum);
+    printf("= %d\n", sum);
+    return sum;
 }
 
 int input_start(int *start) {
@@ -79,7 +117,7 @@ int input_number_of_items(int *number_of_items) {
     int is_valid = TRUE;
     char endline = '\0';
     printf("Input the number of items for the A.P. series:\n");
-    if (!scanf("%d%c", number_of_items, &endline) || endline != '\n' || *number_of_items == 0) {
+    if (!scanf("%d%c", number_of_items, &endline) || endline != '\n' || *number_of_items <= 0) {
         is_valid = FALSE;
     }
     return is_valid;