+ Start a Discussion
Purushottam Dank 1Purushottam Dank 1 

Hello everyone , my question is related to apex

hello everyone, i just started journey with salesforce ,
i want to do following programms in apex , help me to solve....
Factorial program
program to find HCF and LCM
program to convert decimal to binary
program to find nCr and nPr
program to add n numbers
Swap numbers program
program to reverse a number
palindrome number program.
 
Best Answer chosen by Purushottam Dank 1
Sorna JenefaSorna Jenefa
Please try the below one:
Type the code in developer console  and exceute it
Factorial program:
public class sample 
{
public void fact(Integer n)
{
    long ans = 1;
    if (n < 0) {
        System.debug('No negative numbers');
    }
    else
    {
    for (Integer i = 1; i <= n; i++) {
        ans *= i;
    }
    }
  System.debug(ans);

    }
}
Press Ctrl+E and Type it

sample s=new sample();
s.fact(5);

program to find HCF and LCM

public class sample {
public void f(Integer x,Integer y)
{
    Integer a, b,t, gcd, lcm;
 
 System.debug('x:'+x+'y:'+y);
  a = x;
  b = y;
  while (b != 0) {
    t = b;
    b = math.mod(a,b);
    a = t;
  }
   gcd = a;
  lcm = (x*y)/gcd;
  System.debug(gcd);
 System.debug(lcm);

 }
}
Press Ctrl+E and Type it
sample s=new sample();
s.f(5,6);

program to convert decimal to binary

public class sample {
public void f(Integer n)
{    
integer[] binaryNum = new integer[1000];
       integer i = 0;
        while (n > 0) 
        {
            binaryNum[i] = math.mod(n , 2);
            n = n / 2;
            i++;
        }
for (integer j = i - 1; j >= 0; j--)
            System.debug(binaryNum[j]);
    } 
}
Press Ctrl+E and Type it

sample s=new sample();
integer n = 17;
s.f(n);

program to find nCr and nPr

public class sample {
public void f(Integer n,Integer r)
{    
Integer ncr, npr;
    ncr = find_ncr(n, r);
   npr = find_npr(n, r);
 
   System.debug('n:'+n+'r:'+r+'ncr'+ncr);
    System.debug('n:'+n+'r:'+r+'ncr'+npr);
 
}
 
public static Integer find_ncr( Integer n, Integer r) {
 Integer result;
    result = factorial(n)/(factorial(r)*factorial(n-r));
    return result;
}
 
public static Integer find_npr( Integer n,  Integer r) {
Integer result;
    result = factorial(n)/factorial(n-r);
    return result;

 
public static Integer factorial( Integer n) {
 Integer c;
Integer result = 1;
    for (c = 1; c <= n; c++)
      result = result*c;
 
   return result;
}
}

Press Ctrl+E and Type it

sample s=new sample();
s.f(7,8);

Please mark it as solved if my reply was helpful.

Thanks,
Jenefa
Sweet Potato Tec
 

All Answers

Shukla YogeshShukla Yogesh
Hi Purushottam

If you want to make an application/UI then you need to create visualforce page for that, if you want to just write code and exceute then you can run code in execute anonymous under debug tab in developer console. 
Let me know if you have any issue.

Regards
Yogesh
SandhyaSandhya (Salesforce Developers) 
Hi,

I would suggest you search for the logic and implement it with apex syntax, in this way you can even learn basics of programming in apex.

Below is the link which can help you to start.

https://webkul.com/blog/apex-programming-basics/
 
Please mark it as solved if my reply was helpful. It will make it available for other as the proper solution.
                                             
Best Regards
Sandhya
 
Sorna JenefaSorna Jenefa
Please try the below one:
Type the code in developer console  and exceute it
Factorial program:
public class sample 
{
public void fact(Integer n)
{
    long ans = 1;
    if (n < 0) {
        System.debug('No negative numbers');
    }
    else
    {
    for (Integer i = 1; i <= n; i++) {
        ans *= i;
    }
    }
  System.debug(ans);

    }
}
Press Ctrl+E and Type it

sample s=new sample();
s.fact(5);

program to find HCF and LCM

public class sample {
public void f(Integer x,Integer y)
{
    Integer a, b,t, gcd, lcm;
 
 System.debug('x:'+x+'y:'+y);
  a = x;
  b = y;
  while (b != 0) {
    t = b;
    b = math.mod(a,b);
    a = t;
  }
   gcd = a;
  lcm = (x*y)/gcd;
  System.debug(gcd);
 System.debug(lcm);

 }
}
Press Ctrl+E and Type it
sample s=new sample();
s.f(5,6);

program to convert decimal to binary

public class sample {
public void f(Integer n)
{    
integer[] binaryNum = new integer[1000];
       integer i = 0;
        while (n > 0) 
        {
            binaryNum[i] = math.mod(n , 2);
            n = n / 2;
            i++;
        }
for (integer j = i - 1; j >= 0; j--)
            System.debug(binaryNum[j]);
    } 
}
Press Ctrl+E and Type it

sample s=new sample();
integer n = 17;
s.f(n);

program to find nCr and nPr

public class sample {
public void f(Integer n,Integer r)
{    
Integer ncr, npr;
    ncr = find_ncr(n, r);
   npr = find_npr(n, r);
 
   System.debug('n:'+n+'r:'+r+'ncr'+ncr);
    System.debug('n:'+n+'r:'+r+'ncr'+npr);
 
}
 
public static Integer find_ncr( Integer n, Integer r) {
 Integer result;
    result = factorial(n)/(factorial(r)*factorial(n-r));
    return result;
}
 
public static Integer find_npr( Integer n,  Integer r) {
Integer result;
    result = factorial(n)/factorial(n-r);
    return result;

 
public static Integer factorial( Integer n) {
 Integer c;
Integer result = 1;
    for (c = 1; c <= n; c++)
      result = result*c;
 
   return result;
}
}

Press Ctrl+E and Type it

sample s=new sample();
s.f(7,8);

Please mark it as solved if my reply was helpful.

Thanks,
Jenefa
Sweet Potato Tec
 
This was selected as the best answer
Purushottam Dank 1Purushottam Dank 1
thank u so much 
Akhilesh Kulkarni 1Akhilesh Kulkarni 1
thanks.