#include <iostream>
#include<iomanip>
using namespace std;
//Amaneet Sidhu--- This program is to calculate the speed of an interger value 
//read in by the user and calcualte the speed by dvidint the read in value by the constant values
int main() 
{
  
  //user menu choice of 1 2 or 3
    int in;
    cin >> in;
    //print menu
    cout << "Select the medium that sound is traveling through:"<< endl;
    cout << "1 Air"<< endl;
    cout << "2 Water"<< endl;
    cout << "3 Steel"<< endl;
    //distance read in
    double distance;
    cin >> distance;
    // values for the mediums
    int air = 1100;
    int water = 4900;
    int steal = 16400;
    
    //check to see if user input is valid
    if(in < 1 || in > 3) {
      cout << "The menu value is invalid. Please run the program again."<< endl;
      exit(0);
    }
    
    if(in == 1){
      //cout << "Air"<< endl;
      cout << "Enter distance (in feet)" << endl;}
    
    if( in == 2){
      //cout << "Water"<< endl;
      cout << "Enter distance (in feet)" << endl;}
      
   if(in == 3){
     // cout << "Steel"<< endl;
      cout << "Enter distance (in feet)" << endl;}
      


    
// checks to see if user input for distance is valid
    if(distance <= 0){
      cout << "The distance must be greater than zero"<< endl;
      exit(0);
    }
   //if Distanc is valid then it will calcuate the speed
    if(in == 1 && distance >= 0) {
      cout << "Air: "<< distance <<setprecision(4)<< " ft"<< endl;
      cout.setf(ios::fixed); 
      cout <<"Traveled for "<<setprecision(3)<< distance/air << " seconds"<<endl ;
      }
    
    if(in == 2 && distance >= 0) {
      cout << "Water: "<< distance <<setprecision(4)<< " ft"<< endl;
       cout.setf(ios::fixed); 
      cout <<"Traveled for "<<setprecision(3)<< distance/water << " seconds"<<endl ;}
      
    if(in == 3 && distance >= 0) {
      cout << "Steel: "<< distance<<setprecision(3) << " ft"<< endl;
       cout.setf(ios::fixed); 
      cout <<"Traveled for "<<setprecision(4)<< distance/steal << " seconds"<<endl ;}
    
  
      
    
   
    return 0;
}

C++ Online Compiler

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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
}