C++ Tutorial/Data Types/int

Calculate the product of three integers

<source lang="cpp">#include <iostream> using std::cout; using std::cin; using std::endl; int main() {

  int x; 
  int y; 
  int z; 
  int result; 
  cout << "Enter three integers: "; 
  cin >> x >> y >> z; // read three integers from user
  result = x * y * z; 
  cout << "The product is " << result << endl; 
  return 0; 

}</source>

Enter three integers: 1 2
3
The product is 6

Calculate the value of product and quotient

<source lang="cpp">#include <iostream> using std::cout; using std::endl; int main() {

  int x = 5;
  int product = 5;
  int quotient = 5;
  product *= x++;
  cout << product << endl;
  cout << x << endl << endl;
  x = 5;
  quotient /= ++x; 
  cout << quotient << endl;
  cout << x << endl;
  return 0; 

}</source>

25
6
0
6

Comparing integers using if statements, relational operators and equality operators.

<source lang="cpp">#include <iostream> using std::cout; using std::cin; using std::endl; int main() {

  int number1; 
  int number2; 
  cout << "Enter two integers to compare: "; 
  cin >> number1 >> number2;
  if ( number1 == number2 )
     cout << number1 << " == " << number2 << endl;
  if ( number1 != number2 )
     cout << number1 << " != " << number2 << endl;
  if ( number1 < number2 )
     cout << number1 << " < " << number2 << endl;
  if ( number1 > number2 )
     cout << number1 << " > " << number2 << endl;
  if ( number1 <= number2 )
     cout << number1 << " <= " << number2 << endl;
  if ( number1 >= number2 )
     cout << number1 << " >= " << number2 << endl;
  return 0;

}</source>

Enter two integers to compare: 4
3
4 != 3
4 > 3
4 >= 3

constant integer value

<source lang="cpp">#include <iostream>

1. include <iomanip>
2. include <cmath>

using namespace std; int main() {

  const double RATE_MIN = 5;
  const double RATE_MAX = 10;
  const double RATE_INCR = 0.5;
  const int YEAR_MIN = 5;
  const int YEAR_MAX = 30;
  const int YEAR_INCR = 5;
  /* print table header */
  int year;
  cout << " Rate  ";
  for (year = YEAR_MIN; year <= YEAR_MAX; year = year + YEAR_INCR)
  {  
     cout << setw(2) << year << " years  ";
  }
  cout << "\n";
  cout << fixed << setprecision(2);
  double initial_balance = 10000;
  double rate;
  for (rate = RATE_MIN; rate <= RATE_MAX; rate = rate + RATE_INCR)
  {  
     /* print table row */
      cout << setw(5) << rate;
      for (int year = YEAR_MIN; year <= YEAR_MAX;
         year = year + YEAR_INCR)
      {  
         double balance = 
            initial_balance * pow(1 + rate / 100, year);
         cout << setw(10) << balance;
      }
      cout << "\n";
  }
  return 0;

}</source>

Convert gallons to liters

<source lang="cpp">#include <iostream> using namespace std; int main() {

 int gallons, liters;
 cout << "Enter number of gallons: ";
 cin >> gallons;       // this inputs from the user
 liters = gallons * 4; // convert to liters
 cout << "Liters: " << liters; 
 return 0;

}</source>

Enter number of gallons: 12
Liters: 48

Define and assign int variables

<source lang="cpp">#include <iostream>

int main()
{
    int a=0, b=0, x=0, y=35;
    std::cout << "a: " << a << " b: " << b;
    std::cout << " x: " << x << " y: " << y << std::endl;
    a = 9;
    b = 7;
    y = x = a+b;
    std::cout << "a: " << a << " b: " << b;
    std::cout << " x: " << x << " y: " << y << std::endl;
    return 0;
}</source>

a: 0 b: 0 x: 0 y: 35
a: 9 b: 7 x: 16 y: 16

Define an int variable

<source lang="cpp">#include <iostream> using namespace std;

int main() {

 int length; // this declares a variable 

 length = 7; // this assigns 7 to length 

 cout << "The length is "; 
 cout << length; // This displays 7 

 return 0; 

}</source>

The length is 7"

Do bit operation on integers: AND, OR, XOR

<source lang="cpp">#include <iostream> using namespace std; int main() {

 int num1, num2,iand,ior,ixor;
 num1 = 1;
 num2 = 2;
 iand = num1 & num2;
 ior = num1 | num2;
 ixor = num1 ^ num2;
 cout << num1 << " AND " << num2 << " is " << iand << endl;
 cout << num1 << " OR "  << num2 << " is " << ior  << endl;
 cout << num1 << " XOR " << num2 << " is " << ixor << endl;
 return 0;

}</source>

1 AND 2 is 0
1 OR 2 is 3
1 XOR 2 is 3

Do calculation in cout

<source lang="cpp">#include <iostream> using namespace std;

int main() {

 int length; 
 int width;  
 
 length = 7; 
 width = 5;  
 
 cout << "The area is ";  
 cout << length * width; 
 
 return 0;  

}</source>

The area is 35"

lists cubes from 1 to 10: int type variable calculation

<source lang="cpp">#include <iostream>

1. include <iomanip>

using namespace std;

int main(){

  int numb;                            
 
  for(numb=1; numb<=10; numb++){   
     cout << setw(4) << numb;          //display 1st column   
     int cube = numb*numb*numb;        //calculate cube   
     cout << setw(6) << cube << endl;  //display 2nd column   
  }
  return 0;   

}</source>

simple FOR loop controlled by int type variable

<source lang="cpp">#include <iostream> using namespace std;

int main(){

  int j; 
 
  for(j=0; j<15; j++)   
     cout << j * j << "  ";   
  cout << endl;   
  return 0;   

}</source>

Use arithmetic operator to get the product of two integers

<source lang="cpp">#include <iostream> using namespace std;

int main() {

 int length; 
 int width;  
 int area;   

 length = 7; 
 width = 5;  
 
 area = length * width; // compute area 

 cout << "The area is ";  
 cout << area;
 
 return 0;  

}</source>

The area is 35"