# Problem B: a novel addition operation

Define the class newInt, including:

1. Data member of type int.

2. Overloaded operator '+'. The calculation rule is: add the numbers in the corresponding positions of A and B, and only keep one digit as the number in the corresponding position of the result. For example: 876 + 543 = 319. Note: this operation does not change the value of two operands.

3. Overloads input and output operators, which are used to input and output property values of objects.

4. Parameterless and parameterless constructors.

Input
Line 1, n > 0, indicates the number of test cases.

Each test case consists of two non negative integers separated by spaces.

Output
See the example.

Sample Input
4
876 543
999 9999
9 1999
199 88
Sample Output
876 + 543 = 319
999 + 9999 = 9888
9 + 1999 = 1998
199 + 88 = 177
HINT
You cannot use characters such as string, char, or string types.

```#include <iostream>
#include <iomanip>
using namespace std;
class newInt
{
private:
int x;
public:
newInt():x(0){}
newInt(int a)
{
x=a;
}
~newInt()
{

}
friend ostream &operator<<(ostream &os,newInt&p)
{
os<<p.x;
return os;
}
friend istream&operator>>(istream&is,newInt&p)
{
is>>p.x;
return is;
}
friend newInt operator+(const newInt &a,const newInt&b)
{
newInt p;
int a1[100];
int a2[100];//Separate numbers for storing separate bits
int a3[100];//Show the final result
for(int i=0;i<100;i++)
{
a1[i]=0;
}
for(int i=0;i<100;i++)
{
a2[i]=0;
}
for(int i=0;i<100;i++)
{
a3[i]=0;
}
int count1=0,count2=0;
int num1=a.x;
int num2=b.x;
int i=0;
int  j=0;
while(num1>0)
{
a1[i++]=num1%10;
num1=num1/10;
count1++;
}
while(num2>0)
{
a2[j++]=num2%10;
num2=num2/10;
count2++;
}
int countmax;
if(count1>count2)
countmax=count1;
else
countmax=count2;
for(int i=0;i<countmax;i++)
{
if(a1[i]+a2[i]<10)
a3[i]=a1[i]+a2[i];
else
{
a3[i]=a1[i]+a2[i]-10;
}

}
int sum=0;
for(int i=countmax;i>=0;i--)
{
sum=10*sum;
sum+=a3[i];
}
p.x=sum;
return p;

}
};
int main()
{
int cases;
newInt a, b, c;
cin>>cases;
for (int i = 0; i < cases; i++)
{
cin>>a>>b;
c = a + b;
cout<<a<<" + "<<b<<" = "<<c<<endl;
}
return 0;
}
```

Posted on Sun, 10 Nov 2019 15:33:56 -0500 by hyabusa