making a simple math quiz with switch statement for loop and while loop in java -

so problem in code need ask 5 questions , ask user if he/she wants continue or stop. if choose continue should take them menu(switch statement) , can choose set of math problems. each option in switch statement should have 5 math questions. if choose stop code should count how many questions got right , calculate percantage correct. tips or wrong code.. know missing loop because i'm not quiet sure put , how make code work in.

{     //keyboard reader     scanner in = new scanner((system.in));     //3 number variables     int num1;     int num2;     int answer;     int operator;     int question = 0;     int num3;     double questioncount = 0;     double correct = 0;      int = 0;     while (i < 7)     {         num1 = (int)(1+math.random()*10);         num2 = (int)(1+math.random()*10);         num3 = (int)(1+math.random()*100);          system.out.println("welcome wsu school of math! ");          system.out.println("please choose 1 of following options math quiz: ");         system.out.println("1: addition number 1-10");         system.out.println("2: additon numbers 1-100");         system.out.println("3: subtraction numbers 1-10");         system.out.println("4: subtraction numbers 1-100");         system.out.println("5: multipication numbers 1-10");         system.out.println("6: exit quiz");         operator = in.nextint();         switch (operator)         {             case 1: system.out.println(num1+"+"+num2+"=");                 question = num1 + num2;                 break;             case 2: system.out.println(num1+"+"+num3+"=");                 question = num1 + num3;                 break;             case 3: system.out.println(num1+"-"+num2+"=");                 if(num1 < num2)                 {                     int temp = num1;                     num1 = num2;                     num2 = temp;                 }                 question = num1 - num2;                 break;             case 4: system.out.println(num3+"-"+num1+"=");                 if(num1 > num3)                 {                     int temp = num1;                     num1 = num3;                     num3 = temp;                 }                 question = num1 - num3;                 break;             case 5: system.out.println(num1+"*"+num2+"=");                 question = num1 * num2;                 break;             case 6:                 if(operator == 6)                 {                     system.exit(-1);                 }                 break;         }         answer = integer.parseint(in.next());          if(answer == -99)         {             system.out.print("good bye!\n");         }         else if (answer == question)         {             system.out.print("correct!\n");             questioncount++;             correct++;         }         else         {             system.out.print("incorrect.\n");             system.out.println("the correct answer = "+question );             questioncount++;         }     }     system.out.println("amount of problems attempted: "+questioncount);     system.out.println("amount of problems correct: "+ correct);     system.out.println("percent got on test = "+correct/questioncount*100); } 

try write "case 6" this:

case 6:         system.out.println("amount of problems attempted: "+questioncount);         system.out.println("amount of problems correct: "+ correct);         system.out.println("percent got on test = "+correct/questioncount*100);           system.exit(-1);         break; 

i cut "system.out.print ..." , put them inside "case 6:". system.exit(-1); close application. if want exit while loop need boolean inter loop , change value inside "case 6" this:

boolean = true; while(a){     //...    case 6:        //...        = false;        break;    //...  } 

or can make sure (i<7) become false. depends on want achieve. hope help!!!