In this Article I have Provided Code of Calculator in C++ using 7 Different Methods
- using Switch case
- using if else
- using functions
- using recursive functions
- using classes
- using friend functions
- using operator overloading
Code for Calculator using Simple Switch Case in C++
//Calculator using switch statement
#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
float n1,n2,res;
int ch;
cout<<"\n\t================================================================\n"<<endl;
cout<<"\n\t Calculator using Switch "<<endl;
cout<<"\n\t================================================================\n"<<endl;
do
{
cout<<"Enter Two Numbers \n\n";
cout<<"Number 1 : ";cin>>n1;
cout<<"Number 2 : ";cin>>n2;
cout<<"\nEnter choice what you want to calculate\n\n";
cout<<"1-Addition(+)\n";
cout<<"2-Subtract(-)\n";
cout<<"3-Multiply(*)\n";
cout<<"4-Divide(/)\n";
cout<<"5-Modulus(%)\n";
cout<<"6-Exit\n";
cin>>ch;
switch(ch)
{
case 1:
cout<<n1<<" + "<<n2<<" = "<<n1+n2<<endl;
break;
case 2:
cout<<n1<<" - "<<n2<<" = "<<n1-n2<<endl;
break;
case 3:
cout<<n1<<" * "<<n2<<" = "<<n1*n2<<endl;
break;
case 4:
cout<<n1<<" / "<<n2<<" = "<<n1/n2<<endl;
break;
case 5:
cout<<(int)n1<<" % "<<(int)n2<<" = "<<(int)n1%(int)n2<<endl;
break;
default:
cout<<"Thank you for using this :) \n";
getch();
}
}
while(ch>0 && ch<6);
}Calculator using If Else in C++
//Calculator using if else statement
#include<iostream>
using namespace std;
#include<conio.h>
#include<math.h>
int main()
{
float n1,n2;
int ch;
cout<<"\nEnter choice what you want to calculate\n\n";
cout<<"1-Sum "<<endl;
cout<<"2-Subtract "<<endl;
cout<<"3-Multiply "<<endl;
cout<<"4-divide"<<endl;
cout<<"5-Modulus"<<endl;
cout<<"6-Square"<<endl;
cout<<"7-square Root "<<endl;
cin>>ch;
if(ch>=1 && ch<=5)
{
cout<<"Enter Two Numbers \n";
cin>>n1;
cin>>n2;
}
else if(ch==6 || ch==7)
{
cout<<"Enter a number "<<endl;
cin>>n1;
}
if(ch==1)
cout<<n1<<" + "<<n2<<" = "<<n1+n2<<endl;
else if(ch==2)
cout<<n1<<" - "<<n2<<" = "<<n1-n2<<endl;
else if(ch==3)
cout<<n1<<" * "<<n2<<" = "<<n1*n2<<endl;
else if(ch==4)
cout<<n1<<" / "<<n2<<" = "<<n1/n2<<endl;
else if(ch==5)
cout<<n1<<" % "<<n2<<" = "<<(int)n1%(int)n2<<endl;
else if(ch==6)
cout<<"Square of "<<n1<<" is "<<n1*n1<<endl;
else if(ch==7)
cout<<"Square Root of "<<n1<<" is "<<sqrt(n1)<<endl;
else
cout<<"Thank you for using this \n";
}Calculator using functions in C++
//calculator using functions
#include<iostream>
#include<conio.h>
using namespace std;
float sum(float a,float b)
{
return a+b;
}
float sub(float a,float b)
{
return a-b;
}
float mul(float a,float b)
{
return a*b;
}
float div(float a,float b)
{
return a/b;
}
int mod(float a,float b)
{
return (int)a%(int)b;
}
int main()
{
cout<<"\n\t================================================================\n"<<endl;
cout<<"\n\t Calculator using Functions"<<endl;
cout<<"\n\t================================================================\n"<<endl;
float n1,n2,res;
int ch;
do
{
cout<<"Enter Two Numbers \n\n";
cout<<"Number 1 : ";cin>>n1;
cout<<"Number 2 : ";cin>>n2;
cout<<"\nEnter choice what you want to calculate\n\n";
cout<<"1-Addition(+)\n";
cout<<"2-Subtract(-)\n";
cout<<"3-Multiply(*)\n";
cout<<"4-Divide(/)\n";
cout<<"5-Modulus(%)\n";
cout<<"6-Exit\n";
cin>>ch;
switch(ch)
{
case 1:
cout<<n1<<" + "<<n2<<" = "<<sum(n1,n2)<<endl;
break;
case 2:
cout<<n1<<" - "<<n2<<" = "<<sub(n1,n2)<<endl;
break;
case 3:
cout<<n1<<" * "<<n2<<" = "<<mul(n1,n2)<<endl;
break;
case 4:
cout<<n1<<" / "<<n2<<" = "<<div(n1,n2)<<endl;
break;
case 5:
cout<<(int)n1<<" % "<<(int)n2<<" = "<<mod(n1,n2)<<endl;
break;
default:
cout<<"Thank you for using this :) \n";
getch();
}
}
while(ch>0 && ch<6);
}Calculator using Recursive functions in C++
#include<iostream>
#include<conio.h>
using namespace std;
int sum(int a,int b)
{
if(b==0)
return a;
else
return (a,b-1)+1;
}
int sub(int a,int b)
{
if(b==0)
return a;
if(a<0)
return 1+(a,b-1);
else if(b<0)
return 1+(a,b+1);
else
return 1-(a,b-1);
}
int mul(int a,int b)
{
if(b==0)
return a;
else
return a+(a,b-1);
}
int div(int a,int b)
{
if(b>=0)
return 0;
if(a<0)
return 1+(a+b,b);
else
return 1+(a-b,b);
}
int mod(int a,int b)
{
if(b>=0)
return b;
if(a<0)
return 1+(a+b,b);
else
return (a-b,b);
}
int main()
{
cout<<"\n\t================================================================\n"<<endl;
cout<<"\n\t Calculator using Recursion"<<endl;
cout<<"\n\t================================================================\n"<<endl;
float n1,n2,res;
int ch;
do
{
cout<<"Enter Two Numbers \n\n";
cout<<"Number 1 : ";cin>>n1;
cout<<"Number 2 : ";cin>>n2;
cout<<"\nEnter choice what you want to calculate\n\n";
cout<<"1-Addition(+)\n";
cout<<"2-Subtract(-)\n";
cout<<"3-Multiply(*)\n";
cout<<"4-Divide(/)\n";
cout<<"5-Modulus(%)\n";
cout<<"6-Exit\n";
cin>>ch;
switch(ch)
{
case 1:
cout<<n1<<" + "<<n2<<" = "<<sum(n1,n2)<<endl;
break;
case 2:
cout<<n1<<" - "<<n2<<" = "<<sub(n1,n2)<<endl;
break;
case 3:
cout<<n1<<" * "<<n2<<" = "<<mul(n1,n2)<<endl;
break;
case 4:
cout<<n1<<" / "<<n2<<" = "<<div(n1,n2)<<endl;
break;
case 5:
cout<<(int)n1<<" % "<<(int)n2<<" = "<<mod(n1,n2)<<endl;
break;
default:
cout<<"Thank you for using this :) \n";
getch();
}
}
while(ch>0 && ch<6);
}Calculator using Classes in C++
//Calculator using structure
#include<iostream>
using namespace std;
struct calculator
{
float n1,n2,res;
void input()
{
cout<<"\n";
cout<<"\n\t";
cout<<"Enter Number 1:\t";
cin>>n1;
cout<<"\tEnter Number 2:\t";
cin>>n2;
}
void sum()
{
res=n1+n2;
}
void sub()
{
res=n1-n2;
}
void mul()
{
res=n1*n2;
}
void div()
{
res=n1/n2;
}
void print()
{
cout<<"\n\tAnswer is "<<res;
}
};
int main()
{
cout<<"\n\t================================================================\n"<<endl;
cout<<"\n\t Calculator using Structure"<<endl;
cout<<"\n\t================================================================\n"<<endl;
calculator n1;
char op;
do
{
n1.input();
cout<<"\n\tEnter Operation\n";
cout<<"\n\t-->Addition (+)\n";
cout<<"\n\t-->Subtraction (-)\n";
cout<<"\n\t-->Multiplication (*)\n";
cout<<"\n\t-->Division (/)\n";
cout<<"\n\t-->Exit(0)\n\n\t";
cin>>op;
switch (op)
{
case '+':
n1.sum();
n1.print();
break;
case '-':
n1.sub();
n1.print();
break;
case '*':
n1.mul();
n1.print();
break;
case '/':
n1.div();
n1.print();
break;
default:
cout<<"\n\tTHANK YOU "<<endl;
break;
}
}while(op =='+' || op=='-'|| op=='*'||op=='/');
}
Calculator using Friend Functions in C++
#include<iostream>
using namespace std;
class num1;
class num2;
class calculator;
class num2
{
friend class calculator;
protected:
int b;
public:
num2()
{
cout<<"\n\n";
cout<<"\t";
cout<<"Enter Number 2:\t";
cin>>b;
}
calculator friend operator +(num2);
calculator friend operator -(num2);
calculator friend operator *(num2);
// calculator friend operator /(num2);
};
class num1
{
friend class calculator;
protected:
int a;
public:
num1()
{
cout<<"\n\n";
cout<<"\t";
cout<<"Enter Number 1:\t";
cin>>a;
}
calculator friend operator +(num2);
calculator friend operator -(num2);
calculator friend operator *(num2);
//calculator friend operator /(num2);
};
class calculator
{
int res;
public:
calculator()
{
}
friend class num1;
friend class num2;
calculator friend operator +(num2 n2)
{
cout<<"\tAddition: "<<n1.a<<" + "<<n2.b<<" = "<<n1.a+n2.b<<endl;
}
calculator friend operator -(num2 n2)
{
cout<<"\tSubtraction: "<<n1.a<<" - "<<n2.b<<" = "<<n1.a-n2.b<<endl;
}
calculator friend operator *(num2 n2)
{
cout<<"\tMultiplication: "<<n1.a<<" * "<<n2.b<<" = "<<n1.a*n2.b<<endl;
}
calculator friend operator /(num2 n2)
{
cout<<"\tDivision: "<<n1.a<<" / "<<n2.b<<" = "<<n1.a/n2.b<<endl;
}
};
int main()
{
cout<<"\n\t================================================================\n"<<endl;
cout<<"\n\t Calculator using operator Overloading and Friend function"<<endl;
cout<<"\n\t================================================================\n"<<endl;
num1 n1;
num2 n2;
calculator c1;
char op;
cout<<"\n\tEnter Operation\n";
cout<<"\n\tAddition (+)\n";
cout<<"\n\tSubtraction (-)\n";
cout<<"\n\tMultiplication (*)\n";
cout<<"\n\tDivision (/)\n";
cout<<"\n\t Exit (press any other key)\n\t";
cin>>op;
switch (op)
{
case '+':
n1+n2;
break;
case '-':
n1-n2;
break;
case '*':
n1*n2;
break;
case '/';
n1/n2;
break;
default:
cout<<"\n\tTHANK YOU "<<endl;
break;
}
}
Calculator using Operator Overloading in C++
//calculator using classes and operator overloading
#include<iostream>
using namespace std;
class calculator
{
int a;
public:
calculator()
{
cout<<"\n";
cout<<"\n\t";
cout<<"Enter Number :\t";
cin>>a;
}
calculator(int n)
{
a=n;
}
calculator operator +(calculator n2)
{
calculator c(0);
c.a=a+n2.a;
return c;
}
calculator operator -(calculator n2)
{
calculator c(0);
c.a=a-n2.a;
return c;
}
calculator operator *(calculator n2)
{
calculator c(0);
c.a=a*n2.a;
return c;
}
calculator operator /(calculator n2)
{
calculator c(0);
c.a=a/n2.a;
return c;
}
void print()
{
cout<<"\n\tAnswer is "<<a;
}
};
int main()
{
cout<<"\n\t================================================================\n"<<endl;
cout<<"\n\t Calculator using operator overloading"<<endl;
cout<<"\n\t================================================================\n"<<endl;
calculator n1,n2,n3(0);
char op;
cout<<"\n\tEnter Operation\n";
cout<<"\n\tAddition (+)\n";
cout<<"\n\tSubtraction (-)\n";
cout<<"\n\tMultiplication (*)\n";
cout<<"\n\tDivision (/)\n\n\t";
cin>>op;
switch (op)
{
case '+':
n3=n1+n2;
n3.print();
break;
case '-':
n3=n1-n2;
n3.print();
break;
case '*':
n3=n1*n2;
n3.print();
break;
case '/':
n3=n1/n2;
n3.print();
break;
default:
cout<<"\n\tTHANK YOU "<<endl;
break;
}
}