C++ program to read roll number and marks

This C++ program shows how to declare and use int variables. Program will read roll number and marks from user and display it on screen.

#include<iostream>
using namespace std;
int main()
{
 int marks, rollno;

 cout << "Enter your Roll No:";
 cin >> rollno;

 cout << "Enter your Marks:";
 cin >> marks;

 cout << "\nYour Roll No. is " << rollno << "\n";
 cout << "Your marks are " << marks;
 return 0;
}

Output of program

Enter your Roll No:101
Enter your Marks:90

Your Roll No. is 101
Your marks are 90

Fahrenheit to Celsius using C++

Write C++ program to read temperature in Fahrenheit and print it in Celsius.

#include<iostream>

using namespace std;

int main()

{

    float f,c;

    cout << "Enter temperature in Fahrenheit(f)=";

    cin >> f;

 

    c = 5 * ( f - 32 ) / 9;

 

    cout<<"Temperature in Celsius = " << c;

 

    return 0;

}

Output

Enter temperature in Fahrenheit(f)=100

Temperature in Celsius = 37.7778

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Simple Interest using C++ Program.

C++ program to find simple interest based on given P, R, N and I.

#include<iostream>

using namespace std;

int main()

{

    float P,R,N,I;

 

    cout<<"Enter Principle Amount: ";

    cin>>P;

 

    cout<<"Enter Rate of Interest: ";

    cin>>R;

 

    cout<<"Enter No. of Years: ";

    cin>>N;

 

    I=(P*R*N)/100;

 

    cout<<"Simple interest is : "<< I;

 

    return 0;

}

Output:

Enter Principle Amount: 1000

Enter Rate of Interest: 12

Enter No. of Years: 2

Simple interest is : 240

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Using char variable in C++ programs.

Example: Using char variable in C++ programs.

#include<iostream>

using namespace std;

int main()

{

   char name[20];

   cout<<"Enter your name: ";

   cin>>name;

   cout<<"Your Name is : "<< name;

   return 0;

}

Output of program

Enter your name: Earth
Your Name is : Earth

Note: This program will be able to read only one word as your name.

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Using int in C++ Program

Example: Using integer variables in C++ programs.

#include<iostream>

using namespace std;

int main()

{

  int rollno;

  cout<<"What is your Roll Number? ";

  cin>>rollno;

  cout<<"Your Roll Number is "<<rollno;

  return 0;

}

Output of Program

What is your Roll Number? 101
Your Roll Number is 101

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Hello World in C++

Let’s begin with a simple C++ program to display "Hello World" on the screen.

Example: Hello World Program in C++

#include <iostream> using namespace std; int main() {     cout << "Hello World";     return 0; }

Output of program

Hello World

Description of Program

• C++ program starts from the main() function.
• cout is the standard output stream to print "Hello, World!" on monitor.
• return 0; indicates program ends and returns 0 to calling program.

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Difference between C and Python

C and Python are general purpose computer programming language. Python is generally preferred for server side scripting. Some of the key difference between C and Python are given below:

Table: Difference between C and Python

C Language	Python Language
Designed by Dennis Richie	Product from Python Software Foundation
C programs are faster but coding is complex and long	Coding is easier and short in Python
C requires type declaration	Python does not require type declaration
C supports in line assignment	Python does not support in line assignment