#include <iostream>
using namespace std;
//course structure
struct Course
{
    int course_ID;
    string course_title;
    float credit_hrs;
} ;
int counter = 0;
//Function Definition to Add a Course 
void AddCourse(Course course[]) {
    counter++; //global counter increase

    cout<<"\nCourse ID: ";
    cin>>course[counter-1].course_ID; //counter-1 b/c arrays start at 0
    
    cout<<"\nCourse Title: ";
    cin>>course[counter-1].course_title;

    cout<<"\nCredit Hrs: ";
    cin>>course[counter-1].credit_hrs;
    
    cout<<endl<<course[counter-1].course_ID<<" added to the Course"; //tell user course added successfully
}
Function Definition to Update a Course 
/*void SearchCourse (C course[]) {
    
    cout<<"\nCourse ID: ";
    cin>>course[counter-1].course_ID; 
    
    cout<<"\nCourse Title: ";
    cin>>course[counter-1].course_title;

    cout<<"\nCredit Hrs: ";
    cin>>course[counter-1].credit_hrs;
    
    cout<<endl<<course[counter-1].course_ID<<" updated to the Course"; //tell user course updated successfully
}
int main()
{
    Course c1[5]; //Phonebook instance
    int userChoice; //Variable to use to select menu choice
    
    while(1){
      cout<<"*************Main Menu*************\n";
      cout<<"Press 1 to add a Course \n";
      cout<<"Press 2 to update a Course \n";
      cout<<"Press 3 to delete a Course \n";
      cout<<"Press 4 to search and display a Course\n";
      cout<<"Press 5 to display all Courses\n";
      cout<<"Press 6 to exit the program\n";
      cin>>userChoice;
      switch(userChoice){
        case 1:AddCourse(c1);break;
        case 2:break;
        case 3:break;
        case 4:SearchCourse();
        break;
        case 5:break;
        case 6:exit(0);
      }
    }
    
    return 0;
}
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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
}