Sorting data types with different techniques. (C++ Builder)

FILE - date.h

#include <vcl.h>

#include <string.h>

struct Persons

{

char name[40];

int age;

float income;

};

 bool is_Min (int i,int j) { return (i<j); }

int comp_char(const void *function1,const void *function2)

{

return(strcmp((char*)function1,(char*)function2));

}

void float_Sort(float *table, int size)

{

int i,j;

float temp_float;

for(i=1;i<size;i++)

{

j=i;

temp_float=table[j];

while((j>0) && (table[j-1]>temp_float))

{

table[j]=table[j-1];

j--;

}

table[j]=temp_float;

}

}

The main file:

#include <vcl.h>

#include <string.h>

#include <stdlib.h>

#include <stdio.h>

#include <algorithm>

#include <vector>

#include "date.h"

__fastcall TForm1::TForm1(TComponent* Owner)

: TForm(Owner)

{

 srand(time(NULL));

}

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

void __fastcall TForm1::Button1Click(TObject *Sender)

{

 ListBox1->Items->Clear();

 ListBox2->Items->Clear();

 ListBox3->Items->Clear();

 ListBox4->Items->Clear();

 ListBox5->Items->Clear();

 ListBox6->Items->Clear();

 struct Persons *PP=new struct Persons[10];

 int i,j;

 int *ages=new int[10];

 float *incomes=new float[10];

 char p_date[10][20]={"John Connor","Bob Dylan","Steve Jobs","Michael Jordan","Barack Obama","John Rambo","Ronald Regan",

 "Don Johnson","Mike Tyson","Bruce Lee"};

 for(i=0;i<10;i++)

 {

ages[i]=40+rand()%40;

incomes[i]=1.+rand()%100/1.+rand()%100/1000.;

 }

 for(i=0;i<10;i++)

 {

   strcpy(PP[i].name,p_date[i]);

   PP[i].age=ages[i];

   PP[i].income=incomes[i];

 }

 for(i=0;i<10;i++)

 {

  ListBox1->Items->Add(PP[i].name);

  ListBox2->Items->Add(IntToStr(PP[i].age));

  ListBox3->Items->Add(FloatToStr(PP[i].income)+" mln$");

 }

 float_Sort(incomes,10);

 qsort((void*)p_date,10,sizeof(p_date[0]),comp_char);

 std::vector<int> int_vector(ages,ages+10);

 std::sort (int_vector.begin(), int_vector.end(), is_Min);

 std::vector<int>::iterator temp_iterator;

 for(std::vector<int>::iterator temp_iterator=int_vector.begin();temp_iterator!=int_vector.end();++temp_iterator)

  ListBox5->Items->Add(*temp_iterator);

 for(i=0;i<10;i++)

 {

   strcpy(PP[i].name,p_date[i]);

   PP[i].income=incomes[i];

 }

 for(i=0;i<10;i++)

 {

  ListBox4->Items->Add(PP[i].name);

  ListBox6->Items->Add(FloatToStr(PP[i].income)+" mln$");

 }

}

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

void __fastcall TForm1::Button2Click(TObject *Sender)

{

 Close();

}