C++ Multiply 2 Overflow Numbers

This program will allow you to input 2 large numbers and multiple them using C++

#include <iostream>

#include <cstring>

using namespace std;

char n1[100],n2[100];int r[200];

int main()

{

int n;

cin>>n1>>n2;cout<<" "<<n1<<" * "<<n2<<endl<<"= ";

strrev(n1);strrev(n2);

for(int i=0;i<strlen(n2);i++)

{

for(int j=0;j<strlen(n1);j++)

{

n=(n1[j]-48)*(n2[i]-48);

r[i+j]+=n;

if(r[i+j]>=10)

{

r[i+j+1]+=r[i+j]/10;

r[j+i]=r[i+j]%10;

}

for(int i = strlen(n1) + strlen(n2) - 1 ; i >= 0;i--)

{

if(i==strlen(n1) + strlen(n2) - 1 && r[i]==0)

continue;

cout<<r[i];

}