 #include <iostream>
using namespace std;

int main() 
{
    double marks[6][3] = {{80,65,70}, {95,70,65}, {87,80,73}, {65,45,60}, {45,87,65}, {76,56,43}};//2d array to store marks
    string names[6]={"Maxwell","Carl","Gerhard","Paul","James","Cena"}; //1d array to store names
    int num;
    double total,avg;
    cout<<"Enter a number (1 to 6)";
    cin>>num;
    do{
      cout<<"\nStudent Name: "<<names[num-1]; //displaying students name
      cout<<"\nJD521: "<<marks[num-1][0]; //displaying marks in JD521
      cout<<"\nPRG521: "<<marks[num-1][1]; //displaying marks in PRG521
      cout<<"\nIPG521: "<<marks[num-1][2]; //displaying marks in IPG521
      total=marks[num-1][0]+marks[num-1][1]+marks[num-1][2]; //calculate total marks
      avg=total/3; //calculate average of marks
      cout<<"\nTotal of marks: "<<total; //displaying total marks
      cout<<"\nAverage of all marks: "<<avg; //displaying average of 3 marks
      if(avg>70) //if average is greater than 70, student passed
        cout<<"\nStudent has passed";
      else //if average is less than 70, student failed
        cout<<"\nStudent has not passed\n";
      cout<<"\nEnter a number (1 to 6)";
      cin>>num;
    }while(num<=6); //loop continues till user enter num greater than 6
    return 0;
}

created 4 years ago by Sweta Mandloi

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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
}