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C program to print Christmas tree using stars and special characters

This program is asked by Sam Atkinson Amerity through comment on 18/12/2016.

Question

Do you know how to make a christmas tree in c with code block ?? i need help and also logic explanation :)

Answer

There may be many type of Christmas tree art using special character, I created the following one

                  <&&>
                 <*@**>
                <*%%00*>
               <0@&&&%@@>
              <@%@@*&*%@@>
             <@0%@%@@%%*@&>
            <0%0*0*@&*%*&&0>
           <@%@%&%&0**0*@00%>
          <@*&@0***%&%@@0*@@*>
         <@&0000&&&0%000&@%@@&>
                 #@%0#
                 #%&0#
                 #*&0#
                 #@*0#

Here is the program (In this program I run a loop till 10 rows to create tree branches and print random characters from given 5 characters using srand() and rand() library functions) there are two fixed characters at beginning (<) and end (<) of each line so that tree looks like good.

After printing the branches on the tree, I tried to create rest of the part of the tree by printing random characters (number of character will be printed 3 between two # characters).

In both loops I put some spaces according to need.

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main()
{
	int i,j,randomPos;
	char charSet[]={'@','0','%','*','&'};
	int space=10;
	
	srand(time(NULL));
	
	for(i=1;i<=10;i++)
	{
		//print space
		for(j=0;j<space;j++)
			printf(" ");
		
		printf("%c",'<');
		for(j=0;j<(i*2);j++)
		{
			randomPos=rand()%5;
			printf("%c",charSet[randomPos]);
		}
		printf("%c",'>');
		printf("\n");
		space--;
	}
	//another loop set
	space=9;
	for(i=1;i<5;i++)
	{
		for(j=0;j<space;j++)
			printf(" ");
		
		printf("#");
		for(j=0;j<3;j++)
		{
			randomPos=rand()%5;
			printf("%c",charSet[randomPos]);			
		}
		printf("#");
		printf("\n");
	}
	
	return 0;
}

Output

          <&&>
         <*@**>
        <*%%00*>
       <0@&&&%@@>
      <@%@@*&*%@@>
     <@0%@%@@%%*@&>
    <0%0*0*@&*%*&&0>
   <@%@%&%&0**0*@00%>
  <@*&@0***%&%@@0*@@*>
 <@&0000&&&0%000&@%@@&>
         #@%0#
         #%&0#
         #*&0#
         #@*0#