/* Write C++ programs for sorting a given list of elements in ascending order using Merge sort methods */

#include<iostream> #include<conio.h> using namespace std; void mergesort(int *,int,int); void merge(int *,int,int,int); int a[20],i,n,b[20]; main() { cout <<"\n enter no of elements"; cin >> n; cout <<"enter the elements"; for(i=0;i<n;i++) cin >> a[i]; mergesort(a,0,n-1); cout <<" numbers after sort"; for(i=0;i<n;i++) cout << a[i] << " "; getch(); } void mergesort(int a[],int i,int j) { int mid; if(i<j) { mid=(i+j)/2; mergesort(a,i,mid); mergesort(a,mid+1,j); merge(a,i,mid,j); } } void merge(int a[],int low,int mid ,int high) { int h,i,j,k; h=low; i=low; j=mid+1; while(h<=mid && j<=high) { if(a[h]<=a[j]) b[i]=a[h++]; else b[i]=a[j++]; i++; } if( h > mid) for(k=j;k<=high;k++) b[i++]=a[k]; else for(k=h;k<=mid;k++) b[i++]=a[k]; cout <<"\n"; for(k=low;k<=high;k++) { a[k]=b[k]; cout << a[k] <<" "; } } |

**OUTPUT**

N enter no of elements8 12 5 61 60 50 1 70 81

enter the elements

5 12

60 61

5 12 60 61

1 50

70 81

1 50 70 81

1 5 12 50 60 61 70 81 numbers after sort1 5 12 50 60 61 70 81

lots of error occur when we compile the program

it s very usefull prg

can someone explain the part of the wherein there are two the same functions inside the very own function? the mergesort function

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studentprojects.in > Source Codes > Software Programs > C++ Programs > Basic Programs > C++ programs for sorting a given numbers in ascending order using Merge sort

C++ programs for sorting a given numbers in ascending order using Merge sort

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/* Write C++ programs for sorting a given list of elements in ascending order using Merge sort methods */

#include

#include

using namespace std;

void mergesort(int *,int,int);

void merge(int *,int,int,int);

int a[20],i,n,b[20];

main()

{

cout <> n;

cout <<"enter the elements";

for(i=0;i> a[i];

mergesort(a,0,n-1);

cout <<" numbers after sort";

for(i=0;i<n;i++)

cout << a[i] << " ";

getch();

}

void mergesort(int a[],int i,int j)

{

int mid;

if(i<j)

{

mid=(i+j)/2;

mergesort(a,i,mid);

mergesort(a,mid+1,j);

merge(a,i,mid,j);

}

}

void merge(int a[],int low,int mid ,int high)

{

int h,i,j,k;

h=low;

i=low;

j=mid+1;

while(h<=mid && j<=high)

{

if(a[h] mid)

for(k=j;k<=high;k++)

b[i++]=a[k];

else

for(k=h;k<=mid;k++)

b[i++]=a[k];

cout <<"\n";

for(k=low;k<=high;k++)

{ a[k]=b[k];

cout << a[k] <<" ";

}

}