use switch statement to select question of choice.

src/main/quizproject.c

@@ -51,17 +51,29 @@ int math_answer(int num1) {
 }
 
 void math_display_choice(){
-     int user_answer;
-  for(int i = 0; i < 4; i++){
-      math_choose_question(i);
-      printf("Answer: ");
+    int user_answer, ques_ans;
+    while (ques_ans != 4) {
+    printf("Choose a number between 1 and 4: ");
     scanf("%d", &user_answer);
-      int quiz_answer = math_answer(i);
-      if(quiz_answer == user_answer){
+    user_answer = user_answer-1;
+    switch(user_answer){
+        case 0: case 1: case 2: case 3:
+            math_choose_question(user_answer);
+            printf("Answer: ");
+            scanf("%d", &ques_ans);
+            break;
+        default:
+            printf("Invalid choice!\n");
+            break;
+        }    
+      int quiz_answer = math_answer(user_answer);
+      if(quiz_answer == ques_ans){
        printf("Correct!\n");
       } else {
        printf("Wrong!\n");
+       break;
       }
+    
   }
 
 }