Thread: Cannot input printf function without an error

Code:

#include <stdio.h>
#include <string.h>

int main ()
{
int x;
int attempt=0;
char a;
char b[7];
char c[]="TRUE";
char d[15];
char e[]="Establishment";
    do
    {
       printf("WELCOME TO THE AMERICAN HISTORY INTERACTIVE QUIZ PROGRAM!!!\n");
       printf("THIS SERIES IS ON THE U.S. CONSTITUTION.\n");
       printf("THERE ARE 20 QUESTIONS IN TOTAL.\n");
       printf("PLEASE ENTER A NUMBER IN THE RANGE 1-20,INCLUSIVE:\n");
       printf("ENTER A NUMBER OUTSIDE THIS RANGE TO QUIT THIS PROGRAM.\n");
       scanf("%d",&x);
   
       switch (x)
       {       
           case 1:
           if (attempt>0)
           break;    
           else 
           printf("What is the significance of Madison vs. Marbury?\n");
           printf("a. The U.S. Supreme Court asserted its right to judicial review and transformed the power relationships between the executive, legislative, and the judicial branches.\n");
           printf("b. The Judiciary Act of 1789 was found to be partially unconstitutional.\n");
           printf("c. Marbury did not receive his political appointment in time.\n");
           printf("d. Marbury never became a Justice of the Peace in the District of Columbia.\n");
           scanf(" %c", &a);
                if (a=='a')
                printf("CORRECT!\n");
                else
                printf("INCORRECT!\n");
           ++attempt;
           break;
           
           case 2:
           printf("Which U.S. Constitutional amendment was ratified to ensure American women's voting rights?\n");
           printf("a. 17th\n");
           printf("b. 18th\n");
           printf("c. 19th\n");
           printf("d. 22nd\n");
           scanf(" %c", &a);
                if (a=='c')
                printf("CORRECT!\n");
                else
                printf("INCORRECT!\n");
           break;
   
           case 3:
           printf("Which U.S. Constitutional amendment was ratified to mandate the direct election of U.S. Senators?\n");
           printf("a. 16th\n");
           printf("b. 17th\n");
           printf("c. 18th\n");
           printf("d. 19th\n");
           scanf(" %c", &a);
                if (a=='b')
                printf("CORRECT!\n");
                else
                printf("INCORRECT!\n");
           break;
           
           case 4:
           printf("Which U.S. Constitutional amendment was ratified to ensure American women's voting rights?\n");
           printf("a. 17th\n");
           printf("b. 18th\n");
           printf("c. 19th\n");
           printf("d. 22nd\n");
           scanf(" %c", &a);
                if (a=='c')
                printf("CORRECT!\n");
                else
                printf("INCORRECT!\n");
           break;
   
           case 5:
           printf("Who were the Anti-Federalists?\n");
           printf("a. They opposed demands for a strong central government and instead supported strong states' rights and a federation of states.\n");
           printf("b. They opposed the Federalists.\n");
           printf("c. 19th\n");
           printf("d. 22nd\n");
           scanf(" %c", &a);
                if (a=='c')
                printf("CORRECT!\n");
                else
                printf("INCORRECT!\n");
           break;
   
           case 6:
           printf("What were some of the major weaknesses of the Articles of Confederation?\n");
           printf("a. The U.S. Congress could not lay and collect taxes.\n");
           printf("b. There was no national executive branch to enforce enacted legislation.\n");
           printf("c. The U.S. Congress could not regulate interstate commerce.\n");
           printf("d. All of the above.\n");
           scanf(" %c", &a);
                if (a=='d')
                printf("CORRECT!\n");
                else
                printf("INCORRECT!\n");
           break;
   
           case 7:
           printf("Which amendment is the only one that has been repealed in American history?\n");
           printf("a. 15th\n");
           printf("b. 16th\n");
           printf("c. 17th\n");
           printf("d. 18th\n");
           scanf(" %c", &a);
                if (a=='d')
                printf("CORRECT!\n");
                else
                printf("INCORRECT!\n");
           break;
   
           case 8:
           printf("What are the provisions of the Fifth Amendment?\n");
           printf("I. Due process; freedom from self-incrimination; trials must be preceded by grand jury indictments;\n");
           printf("II. Eminent domain\n");
           printf("III. Double jeopardy\n");
           printf("a. I only \n");
           printf("b. II only \n");
           printf("c. III only\n");
           printf("d. I, II\n");
           printf("e. I, II, III\n");
           scanf(" %c", &a);
                if (a=='e')
                printf("CORRECT!\n");
                else
                printf("INCORRECT!\n");
           break;
   
           case 9:
           printf("What are the provisions of the Fifth Amendment?\n");
           printf("I. Due process; freedom from self-incrimination; trials must be preceded by grand jury indictments;\n");
           printf("II. Eminent domain\n");
           printf("III. Double jeopardy\n");
           printf("a. I only \n");
           printf("b. II only \n");
           printf("c. III only\n");
           printf("d. I, II\n");
           printf("e. I, II, III\n");
           scanf(" %c", &a);
                if (a=='e')
                printf("CORRECT!\n");
                else
                printf("INCORRECT!\n");
           break;
   
           case 10: 
           printf("TRUE or FALSE.\n");
           printf("The U.S. Constitution prohibits the establishment of a state religion.\n");
           printf("Enter the answer:");
           scanf("%s",&b);
                if (strcmp("TRUE",c) == 0 || strcmp("true",c)==0 || strcmp("True",c)==0) 
                printf("CORRECT!\n");
                else
                printf("INCORRECT!\n");
                //Compare strings by setting a string with a pre-set value and the other string based on user input. 
                //Return 0 means that they are interpreted as equal.
           printf("Identify the name of this specific clause.\n");
           printf("Enter the answer:");
           scanf("%s", &d);
                if (strcmp("ESTABLISHMENT",e) == 0 || strcmp("Establishment",e)==0 || strcmp("establishment",e)==0)
                printf("CORRECT!\n");
                else
                printf("INCORRECT!\n");
                //Compare strings by setting a string with a pre-set value and the other string based on user input. 
                //Return 0 means that they are interpreted as equal.
           break;
       }
   } while (x>0 && x<21);

   return 0;   
}

This is fine until I insert printf("This question has been selected."); after if (attempt>0). Once I insert this line, I get an error stating 'else without a previous if'.