// Exercises 2.16
// (Arithmetic) Write a program that asks the user to enter two numbers, obtains
// them from the user and prints their sum, product, difference, quotient, and
// remainder.

#include <stdio.h>

int main()
{
  int x, y, sum, product, difference, quotient, remainder;

  printf( "Please enter two numbers.\n" );
  scanf( "%d%d", &x, &y );

  sum = x + y;
  printf( "The sum of %d and %d is %d.\n", x, y, sum );

  product = x * y;
  printf( "The product is %d.\n", product );

  difference = x - y;
  printf( "The difference of %d and %d is %d.\n", x, y, difference );

  quotient = x / y;
  printf( "The quotient is %d.\n", quotient );

  remainder = x % y;
  printf( "The remainder of %d and %d is %d.\n", x, y, remainder);

  return 0;
}





// Exercises 2.19
// (Arithmetic, Largest value and Smallest Value) Write a program that inputs
// three different integers from the keyboard, then prints the sum, the average,
// the product, the smallest, and the largest of these numbers. Use only the
// single selection form of the if statement you learned in this chapter. The
// screen dialog should appear as follows:
//
// Input three different integers: 13 27 14
// Sum is 54
// Average is 18
// Product is 4914
// Smallest is 13
// Largest is 27

#include <stdio.h>

int main() {
  int x, y, z, sum, average, product;

  printf( "Input three different integers: ");
  scanf( "%d%d%d", &x, &y, &z );

  sum = x + y + z;
  printf("Sum is %d\n", sum );

  average = (x + y + z ) / 3;
  printf("Average is %d\n", average );

  product = x * y * z;
  printf("Product is %d\n", product );

  if ( x < y ) {
    if ( x < z ) {
      printf("Smallest is %d\n", x );
    }
  }

  if ( y < x ) {
    if ( y < z ) {
      printf("Smallest is %d\n", y );
    }
  }

  if ( z < x ) {
    if ( z < y ) {
      printf("Smallest is %d\n", z );
    }
  }

  if ( x > y ) {
    if ( x > z ) {
      printf("Largest is %d\n", x );
    }
  }

  if ( y > x ) {
    if ( y > z ) {
      printf("Largest is %d\n", y );
    }
  }

  if ( z > x ) {
    if ( z > y ) {
      printf("Largest is %d\n", z );
    }
  }

  return 0;
}






// Exercises 2.20
// (Diameter, Circumference and Area of a Circle) Write a program that reads in
// the radius of a circle and prints the circle's diameter, circumference and
// area. Use the constant value 3.14159 for π. Perform each of these calculations
// inside the printf statement(s) and use the conversion specifier %f.
//
// [Note: In this chapter, we have discussed only integer constants and variables
// In Chapter 3 we'll discuss floating-point numbers, i.e., values that can have
// decimal points.]

#include <stdio.h>

int main() {
  int radius, diameter;
  double constantValue, circumference, area;

  printf( "Radius of the circle: \n" );
  scanf( "%d", &radius );

  diameter = radius * 2;
  printf( "The diameter is %d\n", diameter );

  constantValue = 3.14159;
  circumference = constantValue * diameter;
  printf( "The circumference is %f\n", circumference );

  area = constantValue * radius * radius;
  printf("The area of the circle is %f\n", area );

  return 0;
}





// Exercises 2.21
// (Shapes with Asterisks) Write a program that prints the following shapes
// with asterisks.

#include <stdio.h>

int main() {

  printf("*********\n*       *\n*       *\n*       *\n*       *\n*       *\n*       *\n*       *\n*********\n");
  printf("   ***   \n *     *\n*       *\n*       *\n*       *\n*       *\n*       *\n *     *\n   ***   \n");
  printf("  *  \n *** \n*****\n  *  \n  *  \n  *  \n  *  \n  *  \n  *  \n");
  printf("    *    \n   * *   \n  *   *  \n *     * \n*       *\n *     * \n  *   *  \n   * *   \n    *    \n");

  return 0;
}