How do I make their str, def, sstr and so forth random as if they were rolling dice and the set numbers are the max they can roll and 0 is the lleast?

Code:
#include <iostream>
#include <cstdlib>
#include <string>
#include <time.h>

using namespace std;

class Character
{
      public:
             Character();
             ~Character();
             int VIT;
             int max_VIT;
             int SPI;
             int max_SPI;
             int STR;
             int max_STR;
             int DEF;
             int max_DEF;
             int SSTR;
             int max_SSTR;
             int SDEF;
             int max_SDEF;
             int ACC;
             int max_ACC;
             int EVA;
             int max_EVA;
             int AGI;
             int max_AGI;
             int TURN;
             
             int POT;
             int max_POT;
             int HPOT;
             int max_HPOT;
             int FPOT;
             int max_FPOT;
             int ETH;
             int max_ETH;
             int HETH;
             int max_HETH;
             int FETH;
             int max_FETH;
             int ELI;
             int max_ELI;
             int HELI;
             int max_HELI;
             int FELI;
             int max_FELI;
             
             void Command();
             void Attack();
             void Skill();
             void Magic();
             void Summon();
             void Item();
             
             char command[15];
             char skill[15];
             char magic[15];
             char summon[15];
             char item[15];
};

Character::Character()
{}
Character::~Character()
{}

class Swordsman
{
      public:
             Swordsman();
             ~Swordsman();
             int VIT;
             int max_VIT;
             int SPI;
             int max_SPI;
             int STR;
             int max_STR;
             int DEF;
             int max_DEF;
             int SSTR;
             int max_SSTR;
             int SDEF;
             int max_SDEF;
             int ACC;
             int max_ACC;
             int EVA;
             int max_EVA;
             int AGI;
             int max_AGI;
             int TURN;
             
             void Attack();
};

Swordsman::Swordsman()
{}
Swordsman::~Swordsman()
{}

Character Player;
Swordsman Enemy;
int X;
int Y;

void Character::Command()
{
     string command;
     cout<<"\n";
     cout<<"Your Turn\n";
     cin>>command;
     cin.ignore();
     if(command=="Attack"||command=="attack"){Character::Attack();}
     else if(command=="Skill"||command=="skill"){Character::Skill();}
     else if(command=="Magic"||command=="magic"){Character::Magic();}
     else if(command=="Summon"||command=="summon"){Character::Summon();}
     else if(command=="Item"||command=="item"){Character::Item();}
     else{cout<<"(I don't think I should do that.)\n";Character::Command();}
}

void Character::Attack()
{
     if(Player.ACC>=Enemy.EVA)
       {X=Player.STR-Enemy.DEF;
       if(X>0){Enemy.VIT=Enemy.VIT-X;cout<<X<<" Damage\n";}
       else{cout<<"0 Damage\n";}}
     else{cout<<"Miss\n";}
}

void Character::Skill()
{
     string skill;
     cout<<"...";
     cin>>skill;
     cin.ignore();
     if(skill=="Break-Weapon"||skill=="Break-weapon"||skill=="break-weapon")
       {Player.SPI-5;
       if(Player.ACC>=Enemy.EVA)
         {Enemy.STR=Enemy.STR/2;cout<<"Enemy Strength Halved\n";}
       else{cout<<"Miss\n";}}
     else if(skill=="Break-Armor"||skill=="Break-armor"||skill=="break-armor")
       {Player.SPI-5;
       if(Player.ACC>=Enemy.EVA)
         {Enemy.DEF=Enemy.DEF/2;cout<<"Enemy Defence Halved\n";}
       else{cout<<"Miss\n";}}
     else{cout<<"(I don't think I should do that.)\n";Character::Command();}
}

void Character::Magic()
{
     string magic;
     cout<<"...";
     cin>>magic;
     cin.ignore();
     if(magic=="Fire"||magic=="fire")
       {Player.SPI-5;
       if(Player.ACC>=Enemy.EVA){X=Player.SSTR-Enemy.SDEF;
          if(X>0){Enemy.VIT=Enemy.VIT-X;cout<<X<<" Damage\n";}
          else{cout<<"0 Damage\n";}}
       else{cout<<"Miss\n";}}
     else{cout<<"(I don't think I should do that.)\n";Character::Command();}
}

void Character::Summon()
{
     string summon;
     cout<<"...";
     cin>>summon;
     cin.ignore();
     if(summon=="Ifrit"||summon=="ifrit")
       {Player.SPI-20;
       if(Player.ACC*2>=Enemy.EVA){X=Player.SSTR*4-Enemy.SDEF;
          if(X>0){Enemy.VIT=Enemy.VIT-X;cout<<X<<" Damage\n";}
          else{cout<<"0 Damage\n";}}
       else{cout<<"Miss\n";}}
     else{cout<<"(I don't think I should do that.)\n";Character::Command();}
}

void Character::Item()
{
     string item;
     cout<<"...";
     cin>>item;
     cin.ignore();
     if(item=="Potion"||item=="potion")
       {Player.POT-1;X=Player.VIT/3;Player.VIT=Player.VIT+X;
       if(Player.VIT>Player.max_VIT)
         {Player.VIT=Player.max_VIT;cout<<X<<" Vitality Restored\n";}
       else{cout<<X<<" Vitality Restored\n";}}
     else{cout<<"(I don't think I should do that.)\n";Character::Command();}
}

void Swordsman::Attack()
{
     cout<<"\n";
     cout<<"Enemy's Turn\n";
     if(Enemy.ACC>=Player.EVA)
       {X=Enemy.STR-Player.DEF;
       if(X>0){Player.VIT=Player.VIT-X;cout<<X<<" Damage\n";}
       else{cout<<"0 Damage\n";}}
     else{cout<<"Miss\n";}
}

int main()
{
    Player.VIT=100;
    Player.max_VIT=100;
    Player.SPI=50;
    Player.max_SPI=50;
    Player.STR=rand()%20;
    Player.max_STR=20;
    Player.DEF=rand()%15;
    Player.max_DEF=15;
    Player.SSTR=rand()%15;
    Player.max_SSTR=15;
    Player.SDEF=rand()%15;
    Player.max_SDEF=15;
    Player.ACC=rand()%10;
    Player.max_ACC=10;
    Player.EVA=rand()%10;
    Player.max_EVA=10;
    Player.AGI=rand()%5;
    Player.max_AGI=5;
    Player.TURN=0;
    
    Player.POT=5;
    Player.max_POT=100;
    Player.HPOT=5;
    Player.max_HPOT=100;
    Player.FPOT=5;
    Player.max_FPOT=100;
    Player.ETH=5;
    Player.max_ETH=100;
    Player.HETH=5;
    Player.max_HETH=100;
    Player.FETH=5;
    Player.max_FETH=100;
    Player.ELI=5;
    Player.max_ELI=100;
    Player.HELI=5;
    Player.max_HELI=100;
    Player.FELI=5;
    Player.max_FELI=100;
    
    Enemy.VIT=100;
    Enemy.max_VIT=100;
    Enemy.SPI=50;
    Enemy.max_SPI=50;
    Enemy.STR=rand()%15;
    Enemy.max_STR=15;
    Enemy.DEF=rand()%15;
    Enemy.max_DEF=15;
    Enemy.SSTR=rand()%15;
    Enemy.max_SSTR=15;
    Enemy.SDEF=rand()%15;
    Enemy.max_SDEF=15;
    Enemy.ACC=rand()%10;
    Enemy.max_ACC=10;
    Enemy.EVA=rand()%10;
    Enemy.max_EVA=10;
    Enemy.AGI=rand()%5;
    Enemy.max_AGI=5;
    Enemy.TURN=0;
    
cout<<"As your walking down the road a passing swordsman approaches you.\n";
cout<<"He challenges you to a fight and you accept.\n";
    
if(Player.AGI>=Enemy.AGI){Player.TURN=Player.TURN+1;}
else{Enemy.TURN=Enemy.TURN+1;}
    
do
{
if(Player.TURN>Enemy.TURN){Player.Command();Enemy.TURN=Enemy.TURN+2;}
else if(Player.TURN<Enemy.TURN){Enemy.Attack();Player.TURN=Player.TURN+2;}
else{
     if(Player.AGI>=Enemy.AGI){Player.TURN=Player.TURN+1;}
     else{Enemy.TURN=Enemy.TURN+1;}}
}
while(Player.VIT>0||Enemy.VIT>0);
if(Player.VIT<=0){cout<<"You Died\n";cout<<"Game Over\n";}
else{cout<<"Victory\n";}
cin.get();
}