Input + a part of invalid input check done

Author: Ankononenko

For loop/52. Sum of GP series.c

@@ -11,7 +11,7 @@ The numbers for the G.P. series:
 The Sum of the G.P. series : 93.000000
 
 + 1. Write tests (run tests function + body of a test)
-2. Input
++ 2. Input
 3. Invalid input
 4. Finction to print out and find the sum
 5. Check the tests
@@ -21,17 +21,73 @@ The Sum of the G.P. series : 93.000000
 
 #include <stdio.h>
 
+enum is_valid_boolean{
+    TRUE = 1,
+    FALSE = 0
+};
+
 void test(int first_number, int number_of_terms, int common_ratio, int expected_result, int test_number);
 void run_tests();
 int find_gp_series(int first, int number_of_terms, int common_ratio);
+int input_first_number(int *first_number);
+int input_number_of_terms(int *number_of_terms);
+int input_common_ratio(int *common_ratio);
+void print_invalid_input();
 
 int main() {
-    run_test();
+    int first_number = 0;
+    if (input_first_number(&first_number)) {
+        int number_of_terms = 0;
+        if (input_number_of_terms(&number_of_terms)) {
+            int common_ratio = 0;
+            if (input_common_ratio(&common_ratio)) {
+                run_tests();
+            } else {
+               print_invalid_input();
+            }
+        } else {
+        print_invalid_input();
+    }     
+    } else {
+        print_invalid_input();
+    }
     return 0;
 }
 
+int input_common_ratio(int *common_ratio) {
+    int is_valid = TRUE;
+    char endline = '\0';
+    if (!scanf("%d%c", common_ratio, &endline) || endline != '\n') {
+        is_valid = FALSE;
+    }
+    return is_valid;    
+}
+
+int input_number_of_terms(int *number_of_terms) {
+    int is_valid = TRUE;
+    char endline = '\0';
+    if (!scanf("%d%c", number_of_terms, &endline) || endline != '\n') {
+        is_valid = FALSE;
+    }
+    return is_valid;    
+}
+
+int input_first_number(int *first_number) {    
+    int is_valid = TRUE;
+    char endline = '\0';
+    if (!scanf("%d%c", first_number, &endline) || endline != '\n') {
+        is_valid = FALSE;
+    }
+    return is_valid;
+}
+
+void print_invalid_input() {
+    printf("n/a");
+}
+
 int find_gp_series(int first, int number_of_terms, int common_ratio) {
     int sum = 0;
+    printf("%d%d%d",first, number_of_terms, common_ratio);
     return sum;
 }