做的一部分，而陳述不增加我的計數正確嗎？

-1

我正在嘗試使用do while語句（在此需要）陳述某人獲得的分數，但是在我的do語句中嵌套的if語句似乎沒有遞增正確（即無論如何它都會給出0％）？我錯誤地寫了什麼是不增加我的正確變量？做的一部分，而陳述不增加我的計數正確嗎？

這裏是我的代碼如下

Scanner input = new Scanner(System.in); 
int q1 = 2, //answer 1 correct answer 
q2 = 1, //answer 2 correct answer 
q3 = 3, //answer 3 correct answer 
correct = 0, //amount correct 
answer1, //store answer1 
answer2, //store answer2 
answer3; //store answer 3 

System.out.printf("%n Question #1.) What is the capital of Iowa?"); //display question 
System.out.printf("%n 1.) Iowa City \t 2.) Des Moines \t 3.) Dubuque"); //display answer 
System.out.printf("%n Your answer: "); 
answer1 = input.nextInt(); //input becomes initial value 

while (answer1 < 1 || answer1 > 3) //while loop to check if answer is valid 
{ 
System.out.printf("%n Invalid Answer please enter a valid answer: "); //ask for input if not valid 
answer1 = input.nextInt(); 
} 

switch (answer1) //switch statement for input types of answer1 
{ 
case 1: 
    System.out.printf("%n Incorrect"); //if input 1 it is incorrect 
    break; //go to next part of code 

case 2: 
    System.out.printf("%n Correct"); //if input 2 it is correct 
    break; 

case 3: 
    System.out.printf("%n Incorrect"); //if input 3 it is incorrect 
    break; 
} 


System.out.printf("%n Question #2.) Where is Iowa?"); //display question 
System.out.printf("%n 1.) Midwest \t 2.) South \t 3.) Northeast"); //display answer 
System.out.printf("%n Your answer: "); 
answer2 = input.nextInt(); //input becomes initial value 

while (answer2 < 1 || answer2 > 3) //make sure answer is valid 
{ 
System.out.printf("%n Invalid Answer please enter a valid answer: "); //ask for valid input 
answer2 = input.nextInt(); 
} 

switch (answer2) //switch statement for chosen answers 
{ 
case 1: 
    System.out.printf("%n Correct"); //correct if input is 1 
    break; 

case 2: 
    System.out.printf("%n Incorrect"); //incorrect for answer 2 
    break; 

case 3: 
    System.out.printf("%n Incorrect"); //incorrect for answer 3 
    break; 
} 

System.out.printf("%n Question #3.) Who is the new president of UIowa?"); //display question 
System.out.printf("%n 1.) Sally Mason \t 2.) Barack Obama \t 3.) Bruce Harreld"); //display answer 
System.out.printf("%n Your answer: "); 
answer3 = input.nextInt(); //input becomes initial value 

while (answer3 < 1 || answer3 > 3) //make sure valid answer 
{ 
System.out.printf("%n Invalid Answer please enter a valid answer: "); //ask for valid answer 
answer3 = input.nextInt(); 
} 

switch (answer3) //switch to give output depending on answer 
{ 
case 1: 
    System.out.printf("%n Incorrect"); //if input is 1 
    break; 

case 2: 
    System.out.printf("%n Incorrect"); //if input is 2 this statement 
    break; 

case 3: 
    System.out.printf("%n Correct"); //if input is 3 this statement 
    break; 
} 

do { 
if (answer1 == q1) { 
    correct++; 
} 
if (answer2 == q2) { 
    correct++; 
} 
if (answer3 == q3) { 
    correct++; 
} 
} while (correct <= 3); 
if (correct == 3) { 
System.out.printf("%n 100%%"); 
} else if (correct == 2) { 
System.out.printf("%n 66.67%%"); 
} else if (correct == 1) { 
System.out.printf("%n 33.33%%"); 
} else { 
System.out.printf("%n 0%%"); 
} 
} //end method 
} //end class

來源

2016-09-22 Jacob Langreck

用調試器調試你的代碼可能比創建這個問題花費的時間要少。 –

'do {...} while（correct <= 3）;'loop是你的問題。打印出'0％'行時，請嘗試打印出'correct'的值。 –

問題是你正在循環，直到'correct == 4'，這會將你帶到'else'。但目前還不清楚爲什麼你要完全循環。 – shmosel