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calculator.cpp
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calculator.cpp
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#include <iostream>
#include <cstdlib>
#include "calculator.h"
using namespace std;
calculator::calculator() : addCount(0), subCount(0), mulCount(0), divCount(0) {};
int calculator::add(int x, int y){
//base case ---------------------------------
if (y == 0) //base case
return x;
//recursive cases ---------------------------
else if(x >= 0 && y > 0){ //case 1: i.e 2 + 2
addCount++;
return calculator::add((x + 1), (y - 1));
} //case 1
else if(x >= 0 && y < 0){ //case 2: i.e 2 + (-2)
addCount++;
return calculator::add((x - 1), (y + 1));
} //case 2
else if(x <= 0 && y > 0){ //case 3: i.e (-2) + 2
addCount++;
return calculator::add((x + 1), (y - 1));
} //case 3
else if(x <= 0 && y < 0){ //case 4: i.e (-2) + (-2)
addCount++;
return calculator::add((x - 1), (y + 1));
} //case 4
// error case (should never happen) ---------
else{
addCount = -1;
cout << endl << "Invalid input" << endl;
return 0;
} //else
} //add
int calculator::subtract(int x, int y){
//base case ---------------------------------
if (y == 0) //base case
return x;
//recursive cases ---------------------------
else if(x >= 0 && y > 0){ //case 1: i.e 2 - 2
subCount++;
return calculator::subtract((x - 1), (y - 1));
} //case 1
else if(x >= 0 && y < 0){ //case 2: i.e 2 - (-2)
subCount++;
return calculator::subtract((x + 1), (y + 1));
} //case 2
else if(x <= 0 && y > 0){ //case 3: i.e (-2) - 2
subCount++;
return calculator::subtract((x - 1), (y - 1));
} //case 3
else if(x <= 0 && y < 0){ //case 4: i.e (-2) - (-2)
subCount++;
return calculator::subtract((x + 1), (y + 1));
} //case 4
//error case (should never happen) ----------
else{
subCount = -1;
cout << endl << "Invalid input" << endl;
return 0;
} //else
} //subtract
int calculator::multiply(int x, int y){
//base cases --------------------------------
if (y == 0 || x == 0)
return 0;
else if(y % x == x)
return x;
else if (y % x == (0 - x))
return (0 - x); //or -x
//recursive cases ---------------------------
else if (x > 0 && y > 0){ //case 1: i.e 2 * 2
mulCount++;
return x + calculator::multiply(x, (y - 1));
} //case 1
else if (x > 0 && y < 0){ //case 2: i.e 2 * (-2)
mulCount++;
return (0 - x) + calculator::multiply(x, (y + 1));
} //case 2
else if (x < 0 && y > 0){ //case 3: i.e (-2) * 2
mulCount++;
return x + calculator::multiply(x, (y - 1));
} //case 3
else if(x < 0 && y < 0){ //case 4: i.e (-2) * (-2)
mulCount++;
return (0 - x) + calculator::multiply(x, (y + 1));
} //case 4
//error case (should never happen) ----------
else{
mulCount = -1;
cout << endl << "Invalid input" << endl;
return 0;
} //else
} //multiply
int calculator::divide(int x, int y){
//base cases --------------------------------
if(y == 0){ //divide by zero
cout << endl << "Cannot divide by zero!" << endl;
divCount = -1;
return -1;
} // divide by zero
else if(x == 0){ //numerator is zero
return 0;
cout << "x = 0" << endl;
} //numerator is zero
else if(y == x || (-y) == (-x)){ //positive base case
return 1;
cout << "y == x or -y == -x" << endl;
} //positive base case
else if (y == (-x) || (-y) == x){ //negative base case
return (-1);
cout << "y = -x or x = -y" << endl;
} //negative base case
else if(abs(y) > abs(x)){ //fractions - return zero
cout << "absolute value: divide" << endl;
return 0;
} //fractions - return zero
//recursive cases ---------------------------
if(x > 0 && y > 0){ //case 1: 10 / 2
divCount++;
return 1 + calculator::divide((x - y), y);
} //case 1
else if(x > 0 && y < 0){ //case 2: 10 / (-2)
divCount++;
return (-1) + calculator::divide((x + y), y);
} //case 2
else if(x < 0 && y > 0){ //case 3: (-10) / 2
divCount++;
return (-1) + calculator::divide((x + y), y);
} //case 3
else if(x < 0 && y < 0){ //case 4: (-10) / (-2)
divCount++;
return 1 + calculator::divide((x - y), y);
} //case 4
//error case (should never happen) ----------
else{
divCount = -1;
cout << endl << "Invalid input" << endl;
return 0;
} //else
} //int
int calculator::getAddCount(){
return addCount;
} //getAddCount
int calculator::getSubCount(){
return subCount;
} //getSubCount
int calculator::getMulCount(){
return mulCount;
} //getMulCount
int calculator::getDivCount(){
return divCount;
} //getDivCount
void calculator::setAddCount(int s){
addCount = s;
} //setAddCount
void calculator::setSubCount(int s){
subCount = s;
} //setSubCount
void calculator::setMulCount(int s){
mulCount = s;
} //setMulCount
void calculator::setDivCount(int s){
divCount = s;
} //setDivCount