java - Learning to use methods, keep getting error: "cannot convert from void to int" -

i'm trying make script prints out biggest , smallest number using methods, have no clue why methods don't work... placed comment next keep getting error.

i don't need getting script work appreciate it, if explain me why method doesn't work.

here code:

import java.util.scanner;  public class minmax {     public static void main(string[] args) {         int nr1, nr2, nr3, biggest, smallest;         scanner lukija = new scanner(system.in);          system.out.print("input first value: ");         nr1 = lukija.nextint();          system.out.print("input second value: ");         nr2 = lukija.nextint();          system.out.print("input third value: ");         nr3 = lukija.nextint();          biggest = biggest(nr1, nr2, nr3); // here keep getting error         smallest = smallest(nr1, nr2, nr3); // here          system.out.print(biggest + " biggest number.");         system.out.print(smallest + " smallest number.");      }   public static void biggest(int nr1, int nr2, int nr3){      int biggest = 0;      if (nr1>nr2 && nr1>nr3){         nr1=biggest;     } else if (nr2>nr1 && nr2>nr3){         nr2=biggest;     } else if (nr3>nr1 && nr3>nr2){         nr3=biggest;     }   }  public static void smallest(int nr1, int nr2, int nr3){      int smallest = 0;      if (nr1<nr2 && nr1<nr3){         nr1=smallest;     } else if (nr2<nr1 && nr2<nr3){         nr2=smallest;     } else if (nr3<nr1 && nr3<nr2){         nr3=smallest;     }   } } 

modify return signature of method(s), assign value smallest (or biggest) , return variable. like,

public static int biggest(int nr1, int nr2, int nr3){     int biggest = 0;      if (nr1>nr2 && nr1>nr3){         biggest = nr1;     } else if (nr2>nr1 && nr2>nr3){         biggest = nr2;     } else if (nr3>nr1 && nr3>nr2){         biggest = nr3;     }     return biggest; }  public static int smallest(int nr1, int nr2, int nr3){     int smallest = 0;     if (nr1<nr2 && nr1<nr3){         smallest = nr1;     } else if (nr2<nr1 && nr2<nr3){         smallest = nr2;     } else if (nr3<nr1 && nr3<nr2){         // nr3=smallest;         smallest = nr3;     }     return smallest; } 

you simplify above like

public static int biggest(int nr1, int nr2, int nr3){     int biggest = math.max(nr1, nr2);     return math.max(biggest, nr3); }  public static int smallest(int nr1, int nr2, int nr3){     int smallest = math.min(nr1, nr2);     return math.min(smallest, nr3); }