fell

0

#!/usr/bin/env python
#
# Problem Set 1a
#
# A program that computes and prints the 1000th prime number.
# Finds primes using trial division (least efficient method)
#------------------------------------------------------------

prime_count = 0 
n = 2 

while (prime_count <= 1000):
  #if even, check for 2, the only even prime
  if (n % 2 == 0): 
    if n == 2:
      prime_count += 1
    n += 1
  else:
    # number is odd, possible prime
    for div in range(3, n, 2): 
      if (n % div == 0): 
        # not a prime
        n += 1
        break
    else:
      # prime!
      prime_count += 1
      if prime_count == 1000:
        print "The 1000 prime is", n
      else:
        n += 1


#!/usr/bin/env python
#
# Problem Set 1b
# A program that computes the sum of the logarithms of all the
# primes from 2 to n, prints out the sum of logs, n, and the
# ratio of both.
#
#------------------------------------------------------------

from math import log 

logs = 0 

limit = input("Enter a number: ")
limit += 1

for n in range(2, limit):
  #if even, check for 2, the only even prime
  if (n % 2 == 0): 
    if n == 2:
      logs += log(n)
  else:
    # number is odd, possible prime
    for div in range(3, n, 2): 
      if (n % div == 0): 
        # not a prime
        break
    else:
      # prime!
      logs += log(n)

print "Sum of logs of the primes = ", logs
print "n = ", n
print "ratio = ", (float(logs)/float(n))

/* Exercise 1-5
* 
* Description:
*    Modify the temp conversion program to print the table in reverse
*    order, that is, from 300 degrees to 0.
*
* Date:
*    03/31/2011
*
*/

#include <stdio.h>

int main(void)
{
    int fahr;

    for (fahr = 300; fahr >= 0; fahr = fahr - 20)
        printf("%3d %6.1f\n", fahr, (5.0/9.0)*(fahr-32));
}

/* Exercise 1-3
 *
 * Description:
 *  Modify the temperature conversion program to print a heading above
 *  the table.
 *
 * Date: 03/29/2011
 * 
 */

#include <stdio.h>

int main(void)
{

  float fahr, celsius;
  int lower, upper, step;

  lower = 0;
  upper = 300;
  step = 20;

  // print header
  int count = 0;

  while (count < 25)
  {
    // print asterisk
    putchar('*');
    count++;
  }
  putchar('\n');
  // print program name
  printf("Temperature Conversion\n");
  // print a divder
  count = 0;
  while (count < 25) 
  {
    putchar('-');
    count++;
  }
  putchar('\n');
  printf("Fahrenheit\tCelsius\n");
  count=0;
  while (count < 25)
  {
    // print asterisk
    putchar('*');
    count++;
  }
  putchar('\n');


  fahr = lower;
  while (fahr <= upper) {
    celsius = (5.0/9.0) * (fahr-32.0);
    printf("%3.0f\t\t%6.1f\n", fahr, celsius);
    fahr = fahr + step;
  }
}




/* Exercise 1-4
 *
 * Description:
 *  Write a program to print the corresponding Celsius to Fahrenheit table.
 *
 * Date: 03/29/2011
 * 
 */

#include <stdio.h>

int main(void)
{

  float fahr, celsius;
  int lower, upper, step;

  lower = 0;
  upper = 300;
  step = 20;

  // print header
  int count = 0;

  while (count < 25)
  {
    // print asterisk
    putchar('*');
    count++;
  }
  putchar('\n');
  // print program name
  printf("Temperature Conversion\n");
  // print a divder
  count = 0;
  while (count < 25) 
  {
    putchar('-');
    count++;
  }
  putchar('\n');
  printf("Celsius\tFahrenheit\n");
  count=0;
  while (count < 25)
  {
    // print asterisk
    putchar('*');
    count++;
  }
  putchar('\n');


  fahr = lower;
  while (fahr <= upper) {
    fahr = (celsius * (9/5)) + 32;
    printf("%3.0f\t\t%6.1f\n", celsius, fahr);
    celsius = celsius + step;
  }
}

/* Programming in C
*  Exercise 1-1
*
* Description:
* prints "Hello, World!" on the screen
*
* Date: 03/28/2011
*
*/

#include <stdio.h>

int main(void)
{
    printf("Hello, World!\n");

}

  1 #!/usr/bin/env python
  2 #
  3 # Reads first name then last name and prints both.
  4 #-------------------------------------------------
  5 
  6 
  7 first = raw_input('Enter first name: ')
  8 last = raw_input('Enter last name: ')
  9 
 10 print first, last