Problem with conversion with stringstream ?

I am using rand() to put random numbers between 1 - 10 and then I am counting how many of each of these numbers that appeard.
After this I am converting them to std::string and finally I try to display for:
a0 and a1 wich counts the numbers 1 and 2 how many of these that appeard.

Strange thing here is that when displaying the answer in the MessgeBox I could get number like, 506 or 1321564 or 477610 etc...
At maximum it should display 20 as this is the count of numbers that I put in vector FirstNumbers ?
I really wonder what I am missing out ?

Code:

//Declare variables
std::vector<int> FirstNumbers;
int RandomNumber = 0;
int Num0,Num1,Num2,Num3,Num4,Num5,Num6,Num7,Num8,Num9,Num10,Num11,Num12,Num13,Num14,Num15,Num16,Num17,Num18,Num118,Num19,Num20;
std::string a0,a1,a2,a3,a4,a5,a6,a7,a8,a9,b10,b11,b12,b13,b14,b15,b16,b17,b18,b19;
			
//Put Random Numbers beween 0-10 to vector
for( int i = 0; i < 20; i++)
{
	 RandomNumber = rand() &#37; 10; //1 - 10 Random
	 FirstNumbers.push_back(RandomNumber);
}
	
 /*...........................................................................................*/


//Count how many appearences of each Number
for( std::vector<int>::iterator it = FirstNumbers.begin(); it != FirstNumbers.end(); it++)
{					
int Dummy5 = *it;
//Count Numbers;
if(Dummy5 == 0){Num0 = Num0+1;}if(Dummy5 == 1){Num1 = Num1+1;}if(Dummy5 == 2){Num2 = Num2+1;}if(Dummy5 == 3){Num3 = Num3+1;}if(Dummy5 == 4){Num4 = Num4+1;}
if(Dummy5 == 5){Num5 = Num5+1;}if(Dummy5 == 6){Num6 = Num6+1;}if(Dummy5 == 7){Num7= Num7+1;}if(Dummy5 == 8){Num8 = Num8+1;}if(Dummy5 == 9){Num9 = Num9+1;}
if(Dummy5 == 10){Num10 = Num10+1;}if(Dummy5 == 11){Num11 = Num11+1;}if(Dummy5 == 12){Num12 = Num12+1;}if(Dummy5 == 13){Num13 = Num13+1;}if(Dummy5 == 14){Num14 = Num14+1;}
if(Dummy5 == 15){Num15 = Num15+1;}if(Dummy5 == 16){Num16 = Num16+1;}if(Dummy5 == 17){Num17 = Num17+1;}if(Dummy5 == 18){Num18 = Num18+1;}if(Dummy5 == 19){Num19 = Num19+1;}if(Dummy5 == 20){Num20 = Num20+1;}
}

//Convert to std::string				     
stringstream b1; b1 << Num0; a0 = b1.str(); 
stringstream b2; b2 << Num1; a1 = b2.str(); 
stringstream b3; b3 << Num2; a2 = b3.str(); 
stringstream b4; b4 << Num3; a3 = b4.str(); 
stringstream b5; b5 << Num4; a4 = b5.str(); 
stringstream b6; b6 << Num5; a5 = b6.str(); 
stringstream b7; b7 << Num6; a6 = b7.str(); 
stringstream b8; b8 << Num7; a7 = b8.str(); 
stringstream b9; b9 << Num8; a8 = b9.str(); 
stringstream c10; c10 << Num9; a9 = c10.str(); 
stringstream c11; c11 << Num10; b10 = c11.str(); 
stringstream c12; c12 << Num11; b11 = c12.str(); 
stringstream c13; c13 << Num12; b12 = c13.str(); 
stringstream c14; c14 << Num13; b13 = c14.str(); 
stringstream c15; c15 << Num14; b14 = c15.str(); 
stringstream c16; c16 << Num15; b15 = c16.str(); 
stringstream c17; c17 << Num16; b16 = c17.str(); 
stringstream c18; c18 << Num17; b17 = c18.str(); 
stringstream c19; c19 << Num18; b18 = c19.str(); 
stringstream d20; d20 << Num19; b19 = d20.str(); 
   
				 

String^ s1 = gcnew String(a0.c_str());
MessageBox::Show(s1);
			 
					
String^ s2 = gcnew String(a1.c_str());
MessageBox::Show(s2);

Oh my goodness. Use arrays, dude. Use arrays!

Looks like .NET as well which even though I have a huge book on...have no interest in.

It looks like the variables are all uninitialized...

Yes ofcourse, I should have used arrays/vectors. This works fine now.
Thanks for direction.

Code:

stringstream b1;
std::vector<int> Num(20);
std::vector<string> a(20);
for( int i = 0; i < 20; i++ )
{
		b1.str("");
		stringstream b1; b1 << Num[i]; a[i] = b1.str(); 
}

That was about, what 100 lines reduced to about... 8? Arrays really do work wonders, do they not?
And thankfully, vectors initialized its elements to 0. Lucky for you.
Unlucky for you when you thought ints would, too.

They do wonder really, this simplified the code very much.
I will think about that in the future code I am doing to