Exercises

Exercise 1

Write a program called patterns.c. It should be able to print 2 types of patterns. It should first ask for a type of pattern where you can enter 1 or 2. Pattern 1 looks like this

#####
####
###
##
#

Pattern 2 looks like this

    #
   ##
  ###
 ####
#####

After that, it should ask you for the number of rows. Here is pattern 1 with 2, 3, and 4 rows

2 rows

##
#

3 rows

###
##
#

4 rows

####
###
##
#

Here is pattern 2 with 2, 3, and 4 rows

2

  #
 ##

3

   # 
  ##
 ###

4

   # 
  ##
 ###
####

Please make sure that you don't print unnecessary newlines. The tests will fail if you do.

Examples

For pattern 1

$ ./patterns
Enter type of pattern (1 or 2) 1
Number of rows 6
######
#####
####
###
##
#

For pattern 2

 $ ./patterns
 Enter type of pattern (1 or 2) 2
 Number of rows 6
        #
       ##
      ###
     ####
    #####
   ######

Hints

Here is an output with the spaces replaced by . in pattern 2 so that you know how many spaces to print in each of the patterns

$ ./patterns
Enter type of pattern (1 or 2) 2
Number of rows4
...#
..##
.###
####

Exercise 2

Write a program called pythagorean.c which will read 3 floating point numbers from the user and then tell you whether the 3 numbers are sides of a right triangle.

You can check this by checking whether the sum of the squares of the smaller two numbers is equal to the square of the largest number.

Example

3,4,5 are the sides of a right triangle since 3²+4²=5²

$ ./pythagorean
side 1 3
side 2 4
side 3 5
Yes

1,2,3 are the not the sides of a right triangle since 1²+2²≠3²

 $ ./pythagorean
 side 1 1
 side 2 2
 side 3 3
 No

The order of input doesn't matter. The program will find the largest number and then check. 3,4,5 are the sides of a right triangle since 3²+4²=5²

 $ ./pythagorean
 side 1 5
 side 2 4
 side 3 3
 Yes