Question

I am having trouble with this as I am a beginner:

This program should have a main function.
3. The program should also have another function called“RoundFunct” and this function should round up or round down a double value to an integer value.
4. Rules: Cannot use round function

• For positive values
  • Round up a value if its fraction part is greater or equal to “.5”
  • Round down a value if its fraction part is less than “.5”
• For negative values
  • Round down a value if its fraction part is greater or equal to “.5”
  • Round up a value if its fraction part is less than “.5”

5. Examples

• 0.4 should be rounded down to 0
• 0.6 should be rounded up to 1
• -0.4 should be rounded up to 0
• -0.6 should be rounded down to -1

Answer 1

source code:

import java.util.Scanner;
public class round
{
public static void main(String...args)
{
Scanner in=new Scanner(System.in);
double input=in.nextDouble();
  
System.out.println(RoundFunc(input)); //calling function
}
  
static int RoundFunc(double input)
{
int x=(int)input; //type casting
int temp=0;
if(input>=0) //input is positive number
{
double y=x+0.5; //calculating y value and compare with input
if(y<input)
temp= x+1;
else if(y>=input)
{
temp= x;
}
}
  
  
else if(input<0) //input is negitive number
{
double y=x-0.5; //compare y value with input and swap
if(y<input)
temp= x;
else if(y>=input)
{
temp= x-1;
}
}
return temp;} //return temp;
  
}