Sample Programs
			       Wednesday 7/10/02

Example #1
----------
// This program decides whether or not the weather is good enough to go 
// swimming outside or not.
#include <iostream.h>

int main() {

  int temperature;
  char answer;

  cout << "Enter the current outside temperature in Fahrenheit : " << flush;
  cin >> temperature;

  if (temperature > 75) {

    cout << "Is it Lightning outside?(Y/N) " << flush;
    cin >> answer;
    
    if ((answer == 'N') || (answer == 'n')) 
      cout << "Great, you should skip class and go swimming outside!!!\n";
    else
      cout << "Sorry, it is too dangerous to swim outside in the lightning.\n";

  }
  else
    cout << "Sorry it is not warm enough to go swimming outside.\n";
  return 0;
} 

Example #2
----------
// This program figures out a students letter grade based on his/her numeric
// grade
#include <iostream.h>

int main() {

  int grade;
  char lettergrade;

  cout << "Enter your numeric grade : " << flush;
  cin >> grade;

  if (grade>90) 
    lettergrade = 'A';
  else if (grade>80)
    lettergrade = 'B;
  else if (grade>70)
    lettergrade = 'C';
  else if (grade>60)
    lettergrade = 'D';
  else
    lettergrade = 'F';

  cout << "For your grade " << grade << " you received a " << lettergrade << endl;

  return 0;
} 

Example #3
----------
// This program adds up the first 20 numbers.
#include <iostream.h>

int main() {

  const int num = 20;

  int counter = 1;
  int sum = 0;

  while (counter <= num) {

    sum = sum + counter;
    counter = counter + 1;    
  }

  cout << "The sum of the numbers from 1 to " << num << " is " << sum << endl;
  return 0;
} 

Example #4
----------
#include <iostream.h>

int triangle(int n);

int main() {

  int num;
  cout << "Enter the number of integers you want to add." << endl;
  cin >> num;
  int sum = triangle(num);
  cout << "The sum of the numbers from 1 to " << num << " is " 
  cout << sum << endl;
  return 0;
}

int triangle(int n) {

  int i=1;
  int sum=0;
  while (i <= n) {
    sum += i;
    i++;
  }
  return sum;
}