[英]Trouble with creating a program that tells whether or not a number is prime
I cannot figure why this program that I came up won't work. 我不知道为什么我提出的这个程序行不通。 I am supposed to make a program that takes uses inputted integer and finds out whether or not the number is prime. 我应该做一个使用输入的整数并找出数字是否为质数的程序。 Right now the program just says every number is prime. 现在程序只说每个数字都是素数。 I just started with java so I feel like I am just not seeing something obvious. 我刚开始使用Java,所以感觉好像看不到明显的东西。 Any help would be great, thanks guys. 谢谢大家的帮助。
public class assignment1 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("Insert Number:");
Scanner scan = new Scanner(System.in);
int variable1 = scan.nextInt();
boolean is_prime = true;
for(int x = 2; x < (variable1 - 1); x++){
if (variable1 % x == 0){
is_prime = false;
}
}
if (is_prime = true){
System.out.println("Prime");
}else if (is_prime = false){
System.out.println("Not Prime");
}
}
} }
if (is_prime = true){
System.out.println("Prime");
}else if (is_prime = false){
System.out.println("Not Prime");
}
You're using the assignment operator =
, not the comparison operator ==
. 您使用的是赋值运算符=
,而不是比较运算符==
。
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