这是一个用于进行测验的java程序，你有10个问题，如果你得到一个答案正确，你会得到1分，但是没有负面标记，当我编译它时会抛出这个：＆＃39; else＆＃ 39;没有＆＃39;如果＆＃39;错误
import java.util.Scanner;
/**
* Write a description of class program1 here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Project
{
public static void main(String[]args)
{
Scanner sc = new Scanner(System.in);
char ans;
int score=0;
System.out.println("1.What was the first mouse created?");
System.out.println("(a)Glass ");
System.out.println("(b) Wood");
System.out.println("(c) Steel");
System.out.println("(d) Paper");
System.out.print("Enter Your Choice => ");
ans=sc.next().charAt(0) ;
if(ans=='b') {
System.out.println("That's correct!");
score+=1;
}
else {
System.out.println("Sorry it is wrong...");
}
System.out.println("2. Who is the father of the 'Internet'?");
System.out.println("(a)Alan Peris ");
System.out.println("(c) Vint Cerf");
System.out.println("(d) Steve Lawrence");
System.out.print("Enter Your Choice => ");
ans=sc.next().charAt(0) ;
if(ans=='c')
System.out.println("That's correct!");
score+=1;
else
System.out.println("Sorry it is wrong...");
System.out.println("3.What search engine provides "instant answers" for certain types of queries?");
System.out.println("(a)Google ");
System.out.println("(b) Yahoo");
System.out.println("(c) Bing");
System.out.println("(d) Dogpile");
System.out.print("Enter Your Choice => ");
ans=sc.next().charAt(0) ;
if(ans=='c')
System.out.println("That's correct!");
score+=1;
else
System.out.println("Sorry it is wrong...");
System.out.println("3.4K might be used synonymously with what acronym?");
System.out.println("(a)UHD ");
System.out.println("(b) VGA");
System.out.println("(c) PCI");
System.out.println("(d) HDR");
System.out.print("Enter Your Choice => ");
ans=sc.next().charAt(0) ;
if(ans=='a')
System.out.println("That's correct!");
score+=1;
else
System.out.println("Sorry it is wrong...");
System.out.println("4. A zero day exploit is a type of what?");
System.out.println("(a) Malware ");
System.out.println("(b) Shareware");
System.out.println("(c) Freeware");
System.out.println("(d) Adware");
System.out.print("Enter Your Choice => ");
ans=sc.next().charAt(0) ;
if(ans=='a')
System.out.println("That's correct!");
score+=1;
else
System.out.println("Sorry it is wrong...");
System.out.println("5.What adjective describes an image that only contains shades of gray?");
System.out.println("(a) Saturated ");
System.out.println("(b) Grayscale");
System.out.println("(c) Hueless");
System.out.println("(d) Black and White");
System.out.print("Enter Your Choice => ");
ans=sc.next().charAt(0) ;
if(ans=='b')
System.out.println("That's correct!");
score+=1;
else
System.out.println("Sorry it is wrong...");
System.out.println("6.What does it mean if a device is erg onomic?");
System.out.println("(a) It is upgradeable");
System.out.println("(b) It is enviromentally friendly");
System.out.println("(c) It is compatible with multiple platforms");
System.out.println("(d) It is designed to be comfortable to use");
System.out.print("Enter Your Choice => ");
ans=sc.next().charAt(0) ;
if(ans=='d')
System.out.println("That's correct!");
score+=1;
else
System.out.println("Sorry it is wrong...");
System.out.println("7. Which of the following can be synced with iCloud?");
System.out.println("(a) Reminders ");
System.out.println("(b) Contacts");
System.out.println("(c) Calendar");
System.out.println("(d) Websites");
System.out.print("Enter Your Choice => ");
ans=sc.next().charAt(0) ;
if(ans=='d')
System.out.println("That's correct!");
score+=1;
else
System.out.println("Sorry it is wrong...");
System.out.println("8.What is the term "Wi-Fi" short for?");
System.out.println("(a) Wireless Fidelity");
System.out.println("(b) Wireless Finder");
System.out.println("(c) Wireless Frequency Inte lligence");
System.out.println("(d) Nothing");
System.out.print("Enter Your Choice => ");
ans=sc.next().charAt(0) ;
if(ans=='d')
System.out.println("That's correct!");
score+=1;
else
System.out.println("Sorry it is wrong...");
System.out.println("9. What do keystrokes measure?");
System.out.println("(a) Login attempts");
System.out.println("(b) Secure socket connections");
System.out.println("(c) Keys pressed on a keyboard");
System.out.println("(d) Nothing");
System.out.print("Enter Your Choice => ");
ans=sc.next().charAt(0) ;
if(ans=='c')
System.out.println("That's correct!");
score+=1;
else
System.out.println("Sorry it is wrong...");
System.out.println("10.The veronica search engine is used to search what service?");
System.out.println("(a) Gopher");
System.out.println("(b) Telnet");
System.out.println("(c) BBS");
System.out.println("(d) FTP");
System.out.print("Enter Your Choice => ");
ans=sc.next().charAt(0) ;
if(ans=='a')
System.out.println("That's correct!");
score+=1;
else
System.out.println("Sorry it is wrong...");
System.out.println("Your total score is:"+score);
}
}
}
答案 0 :(得分：1)
你有两个或多个陈述的多个ifs。
如果每个if有多个语句，则必须在此语句周围设置括号。例如：
if(ans=='b') { // Missing
System.out.println("That's correct!");
score+=1;
} // Missing
else { // Should be here but not have to, because you only have one statement here.
System.out.println("Sorry it is wrong...");
}
附上您的陈述使代码更具可读性。尽管事实上它在某些时候是不必要的。
代码中的每个if语句都会重复相同的错误。你必须在每个if语句上修复它。
您所做的其他错误未在字符串中转义"。假设你有一个字符串
String myString = "Hello World";
现在你要写Hello "the one and only" World。所以你必须逃脱所有“在字符串中：
String myString = "Hello \"the one and only\" World";
答案 1 :(得分：0)
你忘记了括号：
if(ans=='b'){
System.out.println("That's correct!");
score+=1;
}
else
System.out.println("Sorry it is wrong...");