Bizzare numbers appears randomly in output.(C++)

My Code:

#include <iostream>
using namespace std;
int main(){
int a[500];
int value;
for(int i=0;i<500;i++){
    cout<<"Please Enter a value (0-100):";
    cin>>value;
    if (value>=0 && value<=100){
        a[i]=value;
    }
    else if(value<0){
        break;
        }
    }
    for(int i=0;i<5;i++){
        cout<<a[i]<<" ";
    }

}

Output Sample:

Please Enter a value (0-100):10

Please Enter a value (0-100):12

Please Enter a value (0-100):5

Please Enter a value (0-100):-5

10 12 5 0 786432

--------------------------------
Process exited after 7.597 seconds with return value 0
Press any key to continue . . .

Array has values that is not given. I have no idea how they are defined. Please help me about this.

Note: Sorry for my mistakes. I am still a newbie.