C++ getting rid of leading zeros in an array

I am having a problem getting rid of leading zeros when my Fibonacci program writes to the file. I understand that in my code I don't have anything that would remotely solve this problem, I am just looking for a way that I would go about doing this.

#include <iostream>
#include <ctime>
#include <fstream>

using namespace std;

int x [101] = {-1};
int y [101] = {1};
int z [101] = {0};

int main() {
    for(int i = 0; i <= 100; i++){
        x[i] = 0;
        y[i] = 0;
        z[i] = 0;
    }
    x[0] = -1;
    y[0] = 1;
    int j = 0;
    ofstream push;
    clock_t elapsed, start;

    start = clock();

    // Create // Open // Write Receipt
    push.open("Fibonacci.txt");

    do {

        for (int i = 0; i <99 ; i++) {

            if (j % 3 == 0) {
                if(i == 0){
                    z[i] = 0;
                }

                z[i+1]=0;

                z[i] += x[i] + y[i];

                if (z[i] >= 10) {
                    z[i+1] += 1;
                    z[i] -= 10;
                } else {
                    z[i+1] = 0;
                }
            } else if (j % 3 == 1) {
                if(i == 0){
                    x[i] = 0;
                }

                x[i+1] = 0;
                x[i] += z[i] + y[i];

                if (x[i] >= 10) {
                    x[i+1] = 1;
                    x[i] -= 10;
                } else {
                    x[i+1] = 0;
                }
            } else if (j % 3 == 2) {
                if(i == 0){
                    y[i] = 0;
                }

            y[i+1]=0;
            y[i] += x[i] + z[i];

            if (y[i] >= 10) {
                y[i+1] = 1;
                y[i] -= 10;
            } else {
                y[i+1] = 0;
            }
        }
    }

    push << j+1 << ". " ;

    do {
        for(int i = 99; i >= 0;i--){
            if(j % 3 == 0){
                push << z[i];
            } else if (j % 3 == 1){
                push << x[i];
            } else {
                push << y[i];
            }
        }
    } while (j < 477);

    push << endl;
    j++;
} while (j < 477);

// return elapsed time in milliseconds
elapsed = clock() - start;
push << endl << "Time elapsed: " << elapsed << endl << endl;
push.close();

system("pause");
return 0;
}