Solution#2

#include<iostream>
#include<cstdlib>
#include<fstream>
#include<string>
#include<sys/types.h>
#include<sys/wait.h>
using namespace std;

void create_dir()//Function to create two dir with some files
{
	system("mkdir Folder1");//create dir1
	//insert some files in dir1
	system("ls > Folder1/File1.txt");
	system("> Folder1/Music.mp3");
	system("> Folder1/Pic1.JPG");

	system("mkdir Folder2");//create dir2
	//insert some files in dir2
	system("ls -ld > Folder2/File1.txt");
	system("ls -a > Folder2/File2.txt");
	system("> Folder2/PicX1.gif");
	system("> Folder2/Music.mp3");
	system("> Folder2/Movie1.mp4");
}
void create_tem()//Function to create temp files
{
	system("ls -l Folder1 > temp1.txt");//make temp1 txt file for Folder1
	system("ls -l Folder2 > temp2.txt");//make temp2 txt file for Folder2
}
void print()//Fuction to print file names in FOLDER1 & FOLDER2
{
	ifstream infile1; infile1.open("temp1.txt");
	ifstream infile2; infile2.open("temp2.txt");
	int size=0;
	string temp;
	//To get number of files
	while(getline(infile1,temp)){size++;}
	while(getline(infile2,temp)){size++;}
	infile1.close();
	infile2.close();
	infile1.open("temp1.txt");
	infile2.open("temp2.txt");
	//Create string arraies to remove same names of files
	string fileName1[size];
	string fileName2[size];
	int i=0; int j=0;
	bool found;
	while(getline(infile1,temp)){fileName1[i]=temp; i++;}
	while(getline(infile2,temp)){
		found=false;
		for(int n=1; n<i; n++){//To check all names in fileName1 without first line
			if (temp==fileName1[n]){found=true; break;}
		}
		//if (found == false) store the temp string in fileName2
		if(found==false){fileName2[j]=temp; j++;}
	}
	cout<<"\n";
	cout<<"List of files in Folder1 & Folder2:\n\n";
	for (int n=1; n<i; n++){cout<<fileName1[n]<<endl;}//print names of folder1
	for (int n=1; n<j; n++){cout<<fileName2[n]<<endl;}//print names of folder2
	infile1.close();
	infile2.close();
	cout<<"\n";
}
void del()//Function to delete termporary files
{
	system("rm temp1.txt");
	system("rm temp2.txt");
}
int main(){
	create_dir();//call function of create 2 Folders
	int a=fork();//create child
	if(a==0){//--------------For child process
		create_tem();//call function of create 2 temp file
		exit(0);
	}else if(a>0){//---------For parent porcess
	}else{cerr<<"NO Fork1"<<endl;}
	wait(NULL);
	int b=fork();//create child2
	if(b==0){//-------------For child2 process
		print();//call function of print file names
		exit(0);
	}else if(b>0){//--------For parent2 process
	}else{cerr<<"NO Fork2";};
	wait(NULL);
	del();//call function of delete every things
	return 0;
}