bool function and while loop to compare answers

src/main/quizproject.c

@@ -56,7 +56,15 @@ void e_t_f_printQuestions(char askquestion[][100],char answers[]) {
         printf("[%d]. %s", i + 1, askquestion[i]);
         scanf(" %c", &user_answer);
         user_answer = toupper(user_answer);
-        printf("     The answer is: %d\n\n", answers[i]);
+        while (user_answer != 'T' || user_answer != 'F' ){
+            if(user_answer == 'T' || user_answer == 'F') {
+                break;
+            } else {
+                printf("Input is invalid! Enter 'T' for true or 'F' for false [T/F]:\n");
+                scanf(" %c", &user_answer);
+                user_answer = toupper(user_answer);
+            }
+        }
     }
     printf("\t\t---------------------------Round2-----------------------------\n");
     printf("\t\t  >>In this round you will be presented with 2 questions.<<\n");
@@ -65,7 +73,15 @@ void e_t_f_printQuestions(char askquestion[][100],char answers[]) {
         printf("[%d]. %s", i + 1, askquestion[i]);
         scanf(" %c", &user_answer);
         user_answer = toupper(user_answer);
-        printf("     The answer is: %d\n\n", answers[i]);
+        while (user_answer != 'T' || user_answer != 'F' ){
+            if(user_answer == 'T' || user_answer == 'F') {
+                break;
+            } else {
+                printf("Input is invalid! Enter 'T' for true or 'F' for false [T/F]:\n");
+                scanf(" %c", &user_answer);
+                user_answer = toupper(user_answer);
+            }
+        }
     }
 }
 
@@ -94,6 +110,15 @@ void e_ask_questions(void) {
     e_t_f_printQuestions(e_t_f_question, e_t_f_solution);
 }
 
+bool e_true_false(char choice) {
+    if (choice == 'T') {
+        return true;
+    } else if(choice == 'F') {
+        return false;
+    } else {
+        return -1;
+    }
+};
 
 void e_smart_brain() {
     e_display_instruction();

src/main/quizproject.h

@@ -37,6 +37,7 @@ void e_display_instruction(void);
 void e_t_f_printQuestions(char [][100],char []);
 void e_ask_questions(void);
 void e_smart_brain(void);
+bool e_true_false(char); 
 
 //----smart_brain_header_end-------