Question:
As you read in the title, that is the problem as such, I am new to this and I am learning in a self-taught way, when looking for information I find similar things but nothing that comes close to solving the problem.
I don't know what I'm doing wrong or what I'm doing wrong, but I don't know how to correct it because it's giving me even numbers, not primes.
public static void main(String[] args) {
int num=0,cprim=0,n;
Scanner TC = new Scanner (System.in);
int []tam = new int [100];
while (cprim==tam.length){
num+=1;
if (num%2!=0){
tam[cprim]=num++;
cprim++;
}
}
System.out.println(" ¿Cuantos numeros primos desea ver? ");
n= TC.nextInt();
for (int i=0; i<n; i++){
System.out.println( tam[i]+", ");
}
}
}
Answer:
validation if it is a prime number is wrong
if (num% 2! = 0)
What that validation does is check if it is not an even number.
I personally like to work with methods for each action to be performed; for your case I am going to create 3 methods: 1 to validate if it is a prime number, 1 to show the prime numbers and the main method.
I leave you the commented code
public class NumerosPrimos {
static int[]vectorPrimos;
public static void main(String[] args) {
int contador = 0; //Para validar la cantidad de números primos
vectorPrimos=new int[100]; //vector para guardar los 100 números primos
int i=2; //el primer número a evaluar si es primo
Scanner sc=new Scanner(System.in);
while(contador<100){
if(esPrimo(i)){
vectorPrimos[contador]=i;
contador++; //incrementamos por cada número primo
}
i++; //siguiente número a evaluar si es primo
}
System.out.println("Cuanto primos desea mostrar");
mostrarPrimos(sc.nextInt());
}
public static boolean esPrimo(int numero){
int contador = 2;
boolean primo=true;
while ((primo) && (contador!=numero)){
if (numero % contador == 0) //validamos cuando no es primo
primo = false;
contador++;
}
return primo;
}
public static void mostrarPrimos(int cantidad){
for(int i=0;i<cantidad;i++){
System.out.print(vectorPrimos[i]+", "); //mostramos los primos
}
}
}
vectorPrimos is a class variable to access from any method of the class.
Observation
For this opportunity I have created the class variable and the methods in a static way so as not to have to create an object of the class NumerosPrimos but to call the methods directly.