在JAVA程序中有语法错误,用于确定数字是否为质数。

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英文:

there is some sort of error in the syntax of the program "to determine whether the number is prime or not" in JAVA

问题

int n = sc.nextInt();

boolean isPrime = true;

for (int i = 2; i < n; i = i + 1) {
if (n % i == 0) {
isPrime = false;
break;
}
}

if (isPrime == true)
System.out.println("the number is prime");

else if (isPrime == false)
System.out.println("the number is not prime");

英文:

Even if I input the number "4", it shows that the number is prime. Please help to find error in the syntax. I have written below the program I coded :

int n = sc.nextInt();

boolean isPrime = true;

for (int i = 2;  i &lt; n; i = i + 1)
{if (n % i == 0) {
	isPrime = false;
	break;}
}

if (isPrime = true) 
	System.out.println(&quot;the number is prime&quot;);

else if (isPrime = false)
System.out.println(&quot;the number is not prime&quot;);

答案1

得分: 0

Boolean比较需要使用双等号==。您目前的方式是,在该检查中将isPrime设置为true。尝试这样做:

if (isPrime == true)
英文:

Boolean comparison needs to be done with double equals ==. The way you have it currently, you are setting isPrime to be true in that check. Try this:

if (isPrime == true)

答案2

得分: 0

你的程序尚未完成。在if语句中,你写了赋值语句而不是布尔表达式。'='符号用于赋值,由于'isPrime'是一个布尔变量,你可以在if表达式中写'isPrime'。

if (isPrime) {
    System.out.println("这个数字是素数");
} else {
    System.out.println("这个数字不是素数");
}
英文:

Your program is not complete. You have written assignment statement instead of boolean expression in if statement. '=' sign is for assignment, As 'isPrime' is a boolean variable you can write isPrime in if expression

if(isPrime)
{
System.out.println(&quot;the number is prime&quot;);

}
else
{
System.out.println(&quot;the number is not prime&quot;);
}

答案3

得分: 0

使用相等运算符 == 来检查 isPrime 的值,而不是赋值运算符 =

你的代码应该是:

boolean isPrime = true;

for (int i = 2; i < n; i = i + 1) {
    if (n % i == 0) {
        isPrime = false;
        break;
    }
}

if (isPrime == true) 
    System.out.println("这个数字是素数");

else
    System.out.println("这个数字不是素数");

另外,由于 if() 方法的返回类型是布尔值,你可以直接使用 == 进行检查:

boolean isPrime = true;

for (int i = 2; i < n; i = i + 1) {
    if (n % i == 0) {
        isPrime = false;
        break;
    }
}

if (isPrime) 
    System.out.println("这个数字是素数");

else
    System.out.println("这个数字不是素数");
英文:

Use Equality operator == instead of assignment operator = for checking the value of isPrime.

Your code should be:

boolean isPrime = true;

for (int i = 2;  i &lt; n; i = i + 1)
{if (n % i == 0) {
    isPrime = false;
    break;}
}

if (isPrime == true) 
    System.out.println(&quot;the number is prime&quot;);

else
   System.out.println(&quot;the number is not prime&quot;);

Also,since if() method's return type is boolean, you can directly check with using ```==````

boolean isPrime = true;

for (int i = 2;  i &lt; n; i = i + 1)
{if (n % i == 0) {
    isPrime = false;
    break;}
}

if (isPrime) 
    System.out.println(&quot;the number is prime&quot;);

else
   System.out.println(&quot;the number is not prime&quot;);


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  • 本文由 发表于 2020年7月28日 13:20:51
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