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Program to perform merge sort

Posted By: Easy Tutor     Category: C++ Programming     Views: 39757

Write a Program to perform merge sort.

Code for Program to perform merge sort in C++ Programming

//Merge Sort

#include <iostream.h>
#include <conio.h>
#define MAX 10

staticint merge_arr[MAX+MAX],sort_arr[MAX+MAX];

class mergesort{
    int arr1[MAX],arr2[MAX],n1,n2,n3;
    public:
    void getdata();
    void showdata(int);
    void mergeLogic();
    void sortLogic();
};

void mergesort :: getdata(){
    int i;
    cout<<"\n--Data Must be Entered in Sorted Order for each Array--\n\n";
    cout<<"How many elements you require 1st -> Array: ";
    cin>>n1;
    for(i=0;i<n1;i++)
        cin>>arr1[i];
    cout<<"How many elements you require 2nd -> Array: ";
    cin>>n2;
    for(i=0;i<n2;i++)
        cin>>arr2[i];
    n3=n1+n2;
}

void mergesort :: showdata(int select){
    int i;
    if(select==1){
        cout<<"\n\n--Array 1--\n";
        for(i=0;i<n1;i++)
            cout<<arr1[i]<<"   ";
    }
    elseif(select==2){
        cout<<"\n\n--Array 2--\n";
        for(i=0;i<n2;i++)
            cout<<arr2[i]<<"   ";
    }
    elseif(select==3){
        cout<<"\n\n--Sorted Array--\n";
        for(i=0;i<n3;i++)
            cout<<sort_arr[i]<<"   ";
    }
}



void mergesort :: mergeLogic(){
    int i,j,c;
    for(i=0;i<n1;i++)
        merge_arr[i] = arr1[i];
    for(j=i,c=0;j<n3;j++,c++)
        merge_arr[j] = arr2[c];
}


void mergesort :: sortLogic(){
    //before sort call mergeLogic
    mergeLogic();

    int i,j,first=0,second=n1,third=n3;
    i=first;
    j=second;
    staticint c=0;

    while(i<second && j<third){
        if(merge_arr[i] < merge_arr[j]){
            sort_arr[c]=merge_arr[i];
            i++;
        }
        else{
            sort_arr[c]=merge_arr[j];
            j++;
        }
        c++;
    }

    if(i<second){
        while(i<second){
            sort_arr[c]=merge_arr[i];
            i++;
            c++;
        }
    }

    if(j<third){
        while(j<third){
            sort_arr[c]=merge_arr[j];
            j++;
            c++;
        }
    }
}
/*void mergesort :: sortLogic(){    static int i,j,c=0;    while(i<n1 && j<n2){        if(arr1[i] < arr2[j]){            sort_arr[c]=arr1[i];            i++;        }        else{            sort_arr[c]=arr2[j];            j++;        }        c++;    }    if(i<n1){        while(i<n1){            sort_arr[c]=arr1[i];            i++;            c++;        }    }    if(j<n2){        while(j<n2){            sort_arr[c]=arr2[j];            j++;            c++;        }    }}  */void main(){
    clrscr();
    cout<<"\n*****Merge Sort*****\n";
    mergesort obj;
    obj.getdata();
    obj.sortLogic();
    obj.showdata(1);
    obj.showdata(2);
    obj.showdata(3);
    getch();
}
  
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Easy Tutor
Easy Tutor author of Program to perform merge sort is from United States. Easy Tutor says

Hello Friends,

I am Free Lance Tutor, who helped student in completing their homework.

I have 4 Years of hands on experience on helping student in completing their homework. I also guide them in doing their final year projects.

I have share many programs on this website for everyone to use freely, if you need further assistance, than please contact me on easytutor.2ya [at the rate] gmail [dot] com

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Thanks,
Happy Programming :)

 
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Asad Ali from Pakistan Comment on: Jan 08
i really liked your code but it should also have step by step explanations like this http://www.hellgeeks.com/merge-sort/

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