why isnt the code not working any one help?

Question

#include<iostream>
using namespace std;
void selectionsort()
{ int i,j,key,a[100],n;
cout<<"enter the value of n";
cin>>n;
cout<<endl<<"enter the array  elements";
for(i=0;i<n;i++)
{
    cin>>a[i];
}
for(i=1;i<n;i++)
{
    key=a[i];
    j=i-1;
    while(j>=0 && a[j]>key)
    {
        a[j+1]=a[j];
         j=j-1;
    }
   a[i+1]=key;
}
for(i=0;i<n;i++)
{
    cout<<a[i];
}
}
int main()
{
    selectionsort();
}

Answer 1

You incorrectly implemented the selection sort algorithm. Please, read how it should work: https://en.wikipedia.org/wiki/Selection_sort

Some highlights in your code:

• You're supposed to swap elements, not overwrite with an existing value
• You should start from the 0th element, not from the 1st when you sort