Practice with Functions

References and Reference Parameters

• call-by-value : a copy of the argument's value is made and passed to the called function. Changes to the copy inside of called function do not affect the original variable's value in the caller.
• call-by-reference : The caller gives the called function the ability to directly access the caller's data, and to modify that data if the called function so chooses.
  See Fig. 3.20 from the textbook "C++ How to Program".

Debugging using cout to display information in a program.

• Read two natural numbers x and y, and add the multiplications of the values (i*j), where 1 <= i <= y, 1 <= j <= x. Codes
• Detailed information

Exercises

• Read a number i from a terminal, and draw the following figure having i rows. For example, when i = 5, the program displays as follows:
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  + +
  + + +
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  Answer
• Generate a random number. If the value of the random number is multiple of 3, then display the old random number that is already displayed and display the current random number in one line. Define a function check_random() which evaluate the random number being the multiple of 3. If it is multiple of 3, display the old and new numbers, then return the old value substituted with current number. (Hint: You may need to include the header file and to use time(0), srand() and rand() functions to generate a random number.)
  Answer