[Dev-C++] Using Command Line to Execute program

[<Cuo...@ao...>]

Please show me step-by-step how to use DevC++ to run a program through 
Command Line method fpr the following program. Thank you!!!!!!!!!!!!!!


#include  <iostream.h>
#include  <stdlib.h>
#include <stdio.h>
                
//----------------------------------------------------------------------------

----
// array passed as pointer

float  sum_array( float *A, int len )
{
    float s = 0;
    for( int i = 0; i < len; ++i )
    s += A[i];
    return s;
}

// array passed as array of unspecified length

float  average_array( float A[], int len )
{
    return  sum_array( A, len )/len;
}

//----------------------------------------------------------------------------

----
void  main( int argc, char **argv )
{
    if( argc != 1 )
    {
        cerr << "Usage: " << argv[0] << " number" << endl;
        cerr <<"int argc: "<<argc;
        getchar();
        exit(0);
    }

    int  n = atoi( argv[1] );
    
    float  H[n];
    
    for( int i = 1; i <= n; ++i )
    H[i-1] = 1/float(i);
    
    cout << "harmonic number " << n << ":   " << sum_array( H, n ) << endl;
    cout << "average 1/i up to " << n << ": " << average_array( H, n ) << 
endl;
    
    exit(0);
}

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