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StuDocu is not sponsored or endorsed by any college or university COMP1511 Week 02 Laboratory Sample Solutions Introduction to Programming (University of New South Wales) Downloaded by control yolo98 ([email protected]) lOMoARcPSD|3201619
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19/09/2019 COMP1511 Week 02 Laboratory Sample Solutions 1/14 COMP1511 19t2 Week 02 Laboratory Sample Solutions COMP1511 19t2 Objectives using C input/output (I/O) facilities creating simple arithmetic expressions programming with if statements creating relational expressions displaying varying strings Preparation Before the lab you should re-read the relevant lecture slides and their accompanying examples. Getting Started Create a new directory for this lab called lab02 by typing: $ mkdir lab02 Change to this directory by typing: $ cd lab02 Exercise: Don't Be So Negative! (pair) Now create and open a new file called negative.c for this exercise. $ gedit negative.c & Write a program that uses scanf to get a number from a user and prints "Don't be so negative!" if they entered a negative number. If the number is positive, the program should print "You have entered a positive number." If the user enters the number 0, the program should print "You have entered zero." Note: you can assume that the number will always be a whole number (i.e. an integer) Your program should behave as follows: $ dcc -o negative negative.c $ ./negative 3 You have entered a positive number. $ ./negative -3 Don't be so negative! $ ./negative 0 You have entered zero. This is a pair exercise to complete with your lab partner. New! You can run an automated code style checker using the following command: Downloaded by control yolo98 ([email protected]) lOMoARcPSD|3201619
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19/09/2019 COMP1511 Week 02 Laboratory Sample Solutions 2/14 When you think your program is working you can use autotest to run some simple automated tests: $ 1511 autotest negative When you are finished on this exercise you and your lab partner must both submit your work by running give : $ give cs1511 lab02_negative negative.c Note, even though this is a pair exercise, you both must run give from your own account before Monday 17 June 17:00 to obtain the marks for this lab exercise. Sample solution for negative.c // Read in a number, and determine whether it is negative. // If the number is positive, print "You have entered a positive number" // If the number is a zero, print "You have entered zero". // If the number is negative, print "Don't be so negative!" // Sample solution. #include < stdio . h > int main ( void ) { int num ; // Read in a number. scanf ( "%d" , & num ); // Print the relevant message. if ( num > 0 ) { printf ( "You have entered a positive number.\n" ); } else if ( num == 0 ) { printf ( "You have entered zero.\n" ); } else { printf ( "Don't be so negative!\n" ); } return 0 ; } $ 1511 style negative.c Exercise: Icecream Scoops (pair) Create and open a new file called icecream.c for this exercise.
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