#include<iostream> 
#include<math.h> 
using namespace std; 
int main () 
{ 
float a,b,PI; 
int c; 
cout<<endl; 
cout<<"******************** Calculator ******************\n"; 
cout<<"---------------------------------------------------\n"; 
cout<<"Operations\t"<<"\tTrigonometric Functions"<<"\t\tLogarithmic Functions\n"; 
cout<<"------------------------------------------------\n"; 
cout<<"1: Division\t\t"<<"7: Sin\t\t"<<"\t\t13: Log"<<endl; 
cout<<"2: Multiplication\t"<<"8: Cos\t\t"<<"\t\t14: Log with base 10"<<endl; 
cout<<"3: Subtraction\t\t"<<"9: Tan\t\t"<<endl; 
cout<<"4: Addition\t\t"<<"10: Inverse of Sin"<<endl; 
cout<<"5: Exponent\t\t"<<"11: Inverse of Cos"<<endl; 
cout<<"6: Square root\t\t"<<"12: Inverse of Tan"<<endl; 
cout<<"Enter the function that you want to perform : "; 
cin>>c; 
PI=3.14159265; 
switch(c) 
{ 
case 1: 
cout<<"Enter 1st number : "; 
cin>>a; 
cout<<"Enter 2nd number : "; 
cin>>b; 
cout<<"Division = "<<a/b<<endl; 
break; 
case 2: 
cout<<"Enter 1st number : "; 
cin>>a; 
cout<<"Enter 2nd number : "; 
cin>>b; 
cout<<"Multiplication = "<<a*b<<endl; 
break; 
case 3: 
cout<<"Enter 1st number : "; 
cin>>a; 
cout<<"Enter 2nd number : "; 
cin>>b; 
cout<<"Subtraction = "<<a-b<<endl; 
break; 
case 4: 
cout<<"Enter 1st number : "; 
cin>>a; 
cout<<"Enter 2nd number : "; 
cin>>b; 
cout<<"Addition = "<<a+b<<endl; 
break; 
case 5: 
cout<<"Enter the number : "; 
cin>>a; 
cout<<"Enter the exponent : "; 
cin>>b; 
cout<<"Exponent = "<<pow(a,b)<<endl; 
break; 
case 6: 
cout<<"Enter the number : "; 
cin>>a; 
cout<<"Square Root = "<<sqrt(a)<<endl; 
break; 
case 7: 
cout<<"Enter the number : "; 
cin>>a; 
cout<<"Sin = "<<sin(a)<<endl; 
break; 
case 8: 
cout<<"Enter the number : "; 
cin>>a; 
cout<<"Cos = "<<cos(a)<<endl; 
break; 
case 9: 
cout<<"Enter the number : "; 
cin>>a; 
cout<<"Tan = "<<tan(a)<<endl; 
break; 
case 10: 
cout<<"Enter the number : "; 
cin>>a; 
cout<<"Inverse of Sin = "<<asin(a)*180.0/PI<<endl; 
break; 
case 11: 
cout<<"Enter the number : "; 
cin>>a; 
cout<<"Inverse of Cos = "<<acos(a)*180.0/PI<<endl; 
break; 
case 12: 
cout<<"Enter the number : "; 
cin>>a; 
cout<<"Inverse of tan = "<<atan(a)*180.0/PI<<endl; 
break; 
case 13: 
cout<<"Enter the number : "; 
cin>>a; 
cout<<"Log = "<<log(a)<<endl; 
break; 
case 14: 
cout<<"Enter the number : "; 
cin>>a; 
cout<<"Log with base 10 = "<<log10(a)<<endl; 
break; 
default: 
cout<<"Wrong Input"<<endl; 
} 
}
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C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}