ch1-Arithmetic

Chapter_1     ch1-Functions 

Contents:

Hex.cpp     Modulus.cpp     Truncate.cpp     Increment.cpp 

Hex.cpp

#include <iostream>

using std::cout;

using std::endl;

int main()

{

  int x = 0xAa; // 0x is normally followed by lowercase letters a..f

  int y = 0XaA; // 0X is normally followed by uppercase letters A..F

  cout << "x = " << x << endl;

  cout << "y = " << y << endl;

  return 0;

}

/*

g++ Hex.cpp -o Hex

./Hex

x = 170

y = 170

*/

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Modulus.cpp

#include <iostream>

using std::cout;

using std::endl;

int main()

{

  float x = 5, y = 3;

  // cout << "x % y = " << x % y << endl; // compile error

  cout << "x % y = " << (int)x % (int)y << endl;

  return 0;

}

/*

g++ Modulus.cpp -o Modulus

./Modulus

x % y = 2

*/

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Truncate.cpp

#include <iostream>

using std::cout;

using std::endl;

int main()

{

  double d1 = 1.6, d2 = 1.7;

  cout << "d1 = " << d1 << ", d2 = " << d2 << endl;

  int i1 = d1, i2 = d2;

  cout << "i1 = " << i1 << ", i2 = " << i2 << endl;

  cout << "i1 + i2 = " << i1 + i2 << endl;

  int i = d1 + d2; // add doubles, truncate to int only after addition

  cout << "i = " << i << endl;

  cout << "d1 + d2 = " << d1 + d2 << endl;

  cout << "(i1 == d1): " << (i1 == d1) << endl; // no auto truncation

  cout << "(i1 == (int)d1): " << (i1 == (int)d1) << endl;

  return 0;

}

/*

g++ Truncate.cpp -o Truncate

./Truncate

d1 = 1.6, d2 = 1.7

i1 = 1, i2 = 1

i1 + i2 = 2

i = 3

d1 + d2 = 3.3

(i1 == d1): 0 // false

(i1 == (int)d1): 1 // true

*/

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Increment.cpp

#include <iostream>

using std::cout;

using std::endl;

int main()

{

  double d1 = 1.6, d2 = 1.7;

  cout << "d1 = " << d1 << ", d2 = " << d2 << endl;

  d1++; // works for floats too (not just for integers)

  d2 += 2.1; // can use fractional values too, not just integral values

  cout << "d1 = " << d1 << ", d2 = " << d2 << endl;

  return 0;

}

/*

g++ Increment.cpp -o Increment

./Increment

d1 = 1.6, d2 = 1.7

d1 = 2.6, d2 = 3.8

*/

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