cut out even numbers - Programmers Heaven

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# cut out even numbers

Posts: 103Member
i have this java program to calculate factors up to 20. i need to modify it so that even numbers are not calculated. whats the best method??
thanks, ed.

public class fator {

public static void main(String[] args) {
int factValue;
int i;

System.out.println("Java Factor Program by Edwin Rhodes");
System.out.println("
");

for ( i=1; i<21; i++ ) {
factValue = fator.fact(i); // factValue contains factorial of i.
System.out.print("The Value For Factor: ");
System.out.print(i);
System.out.print("is: ");
System.out.print(factValue);
System.out.print("
");
}

}

public static int fact(int someInt) {
int i = 1;
if (someInt > 1)
i = someInt*fact(someInt-1);
return i; // Returns value as result of function
}
}

// End of java program
//

• Posts: 6,349Member
: i have this java program to calculate factors up to 20. i need to modify it so that even numbers are not calculated. whats the best method??
: thanks, ed.
:
:
:
: public class fator {
:
: public static void main(String[] args) {
: int factValue;
: int i;
:
: System.out.println("Java Factor Program by Edwin Rhodes");
: System.out.println("Copyright (C) Edwin Rhodes 2006-2007");
: System.out.println("
");
:
: for ( i=1; i<21; i++ ) {
: factValue = fator.fact(i); // factValue contains factorial of i.
: System.out.print("The Value For Factor: ");
: System.out.print(i);
: System.out.print("is: ");
: System.out.print(factValue);
: System.out.print("
");
: }
:
:
: }
:
: public static int fact(int someInt) {
: int i = 1;
: if (someInt > 1)
: i = someInt*fact(someInt-1);
: return i; // Returns value as result of function
: }
: }
:
:
: // End of java program
: //
:
:
Add an if-statement to the loop, which checks if i is divisable by 2 (hint: use modulo).
• Posts: 103Member
hello i need to modify this program to alternate between skipping the factorial of one even and one odd number ie: 1! 3! 6! ETC

// Start of java program
// by edwin rhodes
//

public class fator {

public static void main(String[] args) {
int factValue;
int i;

System.out.println("Java Factor Program by Edwin Rhodes");
System.out.println("
");

for ( i=1; i<21; i++ ) {
factValue = fator.fact(i); // factValue contains factorial of i.
System.out.print("The Value For Factor: ");

if ( ( i % 2 ) == 0 )
{
System.out.println("Even!");
}

else
{

System.out.print(i);
System.out.print("is: ");
System.out.print(factValue);
System.out.print("
");
}

}

}

public static int fact(int someInt) {
int i = 1;
if (someInt > 1)
i = someInt*fact(someInt-1);
return i; // Returns value as result of function
}
}

// End of java program
//

• Posts: 6,349Member
: hello i need to modify this program to alternate between skipping the factorial of one even and one odd number ie: 1! 3! 6! ETC
:
: // Start of java program
: // by edwin rhodes
: //
:
:
: public class fator {
:
: public static void main(String[] args) {
: int factValue;
: int i;
:
: System.out.println("Java Factor Program by Edwin Rhodes");
: System.out.println("Copyright (C) Edwin Rhodes 2006-2007");
: System.out.println("
");
:
: for ( i=1; i<21; i++ ) {
: factValue = fator.fact(i); // factValue contains factorial of i.
: System.out.print("The Value For Factor: ");
:
:
:
: if ( ( i % 2 ) == 0 )
: {
: System.out.println("Even!");
: }
:
: else
: {
:
: System.out.print(i);
: System.out.print("is: ");
: System.out.print(factValue);
: System.out.print("
");
: }
:
:
:
:
: }
:
:
: }
:
: public static int fact(int someInt) {
: int i = 1;
: if (someInt > 1)
: i = someInt*fact(someInt-1);
: return i; // Returns value as result of function
: }
: }
:
:
: // End of java program
: //
:
:
:
[code]
if (i % 2 <> 0) {
factValue = fact(i);
} else {
factValue = -1;
}
[/code]