C++ Programming in Visual Studio 2019 With Complete Tutorials /create calculator

C++  Programming tutorial

C++ is used to create computer programs.C++ is an effective general-motive programming language. It may be used to develop working systems, browsers, games, and so on. C++ supports distinct approaches to programming like procedural, object-oriented, functional, and so on. This makes C++ effective as well as flexible. C++ is portable and can be used to develop applications that can be adapted to multiple platforms.

  About C++ Programming

Multi-paradigm Language - C++ supports a minimum of seven different sorts of programming.
Developers can choose any of the styles.
General Purpose Language - you'll use C++ to develop games, desktop apps, operating systems, and so on
. Speed - Like C programming, the performance of the optimized C++ code is outstanding. Object-oriented - C++ allows you to divide complex problems into smaller sets by using objects.

 A program must have exactly one and only one function named main
1. The main is the starting point of the program
 2. Every function is divided into two sections
 Local declaration: variables declared are only known to the function and not known outside
Statements


 #include<iostream>
  int main (void)      
{ cout<<“hello world\n”;
 return 0; } 

Create a Calculator with C++ using switch case 

#include <iostream>

# include <iomanip>

using namespace std;

int main()

{

int num1, num2;

char opr;

  cout<<" enter two integers value:";

  cin>>num1 >>num2;

cout<<"enter operator: +(addition), -(substraction),"

<<" *(multi),/(div):";

cin>>opr;

cout<<endl;

cout<<num1<<""<<opr<<" "<<num2 <<"=";

switch (opr)

{

case '+':

cout<<num1 +num2<<endl;

break;

case'-':

cout<<num1-num2<<endl;

break;

case'*':

cout<<num1*num2<<endl;

break;

case'/':

if(num2 !=0)

cout<<num1/num2<<endl;

else

cout<<"error,cannot divided by zero"<<endl;

break;

default:

cout<<"illegal operation"<<endl;

cout<<endl;

}

return 0;

}

For Loop In C++

while you realize precisely how usually you need to loop via code, use the for loop in place of some while loop:

First statement : In for loop first we initialize 

2nd statement: we have a condition 

3rd statement: have an increment

EXAMPLE:

 will print the numbers 0 to 4:

for (int i = 0; i < 5; i++) 

{
  cout << i << "\n";
}

While / Do While Loops

 The  looping through a block of code as long as a specified condition is true is while loop .

 Example  

the code in the loop will run, over and over again, as long as a variable (i) is less  than 5:

int i = 0;
while (i < 5) 
{
  cout << i << "\n";
  i++;
}

Do-while loop

 This loop will execute the code atleast once, before checking if the condition is true, then it will repeat the loop as long as the condition is true.

Example

int i = 0;
do {
  cout << i << "\n";
  i++;
}
while (i < 5);