diff --git a/m1-getting-started-with-programming-in-c/m1-code-challenges-solution/m1-t9-e4.c b/m1-getting-started-with-programming-in-c/m1-code-challenges-solution/m1-t9-e4.c
index 4fa0c64..63c99c1 100644
--- a/m1-getting-started-with-programming-in-c/m1-code-challenges-solution/m1-t9-e4.c
+++ b/m1-getting-started-with-programming-in-c/m1-code-challenges-solution/m1-t9-e4.c
@@ -5,9 +5,10 @@ int main() {
     // WAP to find out the grade of a student based on marks secured in the exam.
     // Code challenge solution
 
-    char grade = ‘X’;
+    char grade = 'X';
     int marks;
     puts("Please enter your marks: ");
+    fflush(stdout);
     scanf("%d", &marks);
 
     if (marks >= 450 && marks <=500) {
@@ -25,11 +26,10 @@ int main() {
     } else {    // For negative value or a value greater than 500
         puts("Invalid input.");
     }
-    
-/* If the marks entered by the user is a valid mark between 0 and 500 then ‘grade’ would not be equal to ‘X’ i.e. he has been assigned a valid grade.  */
-    if (grade != ‘X’)
+
+/* If the marks entered by the user is a valid mark between 0 and 500 then ‘grade’ would not be equal to ‘X’ i.e. he has been assigned a valid grade.  */
+    if (grade != 'X')
         printf("\nYour grade is: %c", grade);
 
     return 0;
 }
-