Week 02 Tutorial Sample Answers

For more detail information of leap years see: Leap Year

Draw a simple flow chart showing the branches of possibilities to decide if a year is a Leap Year.

For some humourous information about flow charts see: Flow Charts (xkcd).

Can you then write some simple code using if/else statements in C that decides if a year is a Leap Year? (hint: modulus is a useful way to decide whether a number is divisible by another) This code question will be continued in this week's lab, so try to remember or keep a copy/photo of the diagram and code you've written.

Determine the value of each expression and sub-expression:

• 1 / 2 * 500
  0
• 1 / 2.0 * 500
  250.0
• (17 / 5) * 5 + (17 % 5)
  17
• (12 - 17) % 6 - 4
  -9

For example:

• The dog is pink || blue
  True
• The dog is pink && blue
  False

For example:

./rectangle_area
Please enter rectangle length: 3
Please enter rectangle width: 5
Area = 15
./rectangle_area
Please enter rectangle length: 42
Please enter rectangle width: 42
Area = 1764

// Compute area of a rectangle using ints
// Modified 3/3/2017 by Andrew Taylor (andrewt@unsw.edu.au)
// as a lab example for COMP1511

// Note this program doesn't check whether
// the two scanf calls successfully read a number.
// This is covered later in the course.

#include <stdio.h>

int main(void) {
    int length, width, area;

    printf("Please enter rectangle length: ");
    scanf("%d", &length);
    printf("Please enter rectangle width: ");
    scanf("%d", &width);

    area = length * width;

    printf("Area = %d\n", area);

    return 0;
}