Lab 1: Introduction to C Programming

1. Lab 1: Introduction to C Programming ITS100: Computer and Programming Lab. Section 1Instructor: WiratChinnan TAs: Ms. SasirassameeBuavirat Mr. ThanasanTanhermhong (Tum) Ms. PattheeraPanitsuk (Fon+) Mr. PongsateTangseng Mr. ChinorotWangtragulsang Mr. KaninAssantachai (Ob)

2. Group Division • 60people in Section 1 / 6TAs • 1 TA per 10 people • TA rotation will be made when quiz • Remember and do not change your seat !

3. About ITS100 Lab • Programming techniques with C programming language • Counterpart of ITS100 lecture. • Requires a lot of practice ! • Simply memorizing commands will not work. • Main website: http://ict.siit.tu.ac.th/its100/ • Schedule • Lecture note download • Important announcements • Code template (after midterm)

4. Lab Score Criteria • Total 50 points from lab • Attendance + Exercise + Speed test  3 points/week • Lab’s midterm exam  10 points • Lab’s final exam  10 points • No homework  • Attendance check starts 15 minutes after the class starts • Do not be late. • 1 point for attendance • SIIT regulation: If the attendance is < 70% (for both lectures and labs), students may not be allowed to take the final exam. • In-class exercise • About 5 exercises. • You can ask TAs for help  • 1 point for completion of the exercises

5. Speed Test (1) • Every week ! (except first week) • 45 minutes • Speed test time: 15:00 – 15:45 • Grading time: 15:45 – 16:00 • Test covers all the content up to and including that week. • But, mainly focus on the content of that week itself. • Always review what you learned weeks before. • Summary sheet allowed  • At http://ict.siit.tu.ac.th/its100/Files/ITS100_Summary_Sheet.pdf • Bring it next week !

6. Speed Test (2) • Speed test should be treated just like a real exam. • Rules: • No talking. Be quiet. • No mobile phone. • No electronic devices other than your PC • No cheating • Cheating will result in a severe penalty • TAs will not help you (except when your PC crashes).

7. Today’s Lab • Review what you learned in lecture 1 & 2 • Already learned lecture 2 ? • Introduction to Code::Blocks • http://www.codeblocks.org/ • Write verysimple C programs.

8. Code::Blocks • Free C/C++ IDE (Integrated Development Environment) • IDE = compiler + editor + debugger + … • http://www.codeblocks.org/ • Recommended to install and practice at home. • To download, go to “Downloads” page: • Select “Download the binary release” • Select “codeblocks-10.05mingw-setup.exe” • NOT codeblocks-10.05-setup.exe • Installation is easy.

9. C Language • High-level general-purpose programming language • Designed in 1972 by Dennis Ritchie • who died in October 2011 (roughly the same time as Steve Jobs) • One of the most widely used programming languages of all time. • Unix is written in C • Foundation of Windows is written in C • Mac OS is based on Unix

10. Introduction to C int main(){ /*statements go here*/ return 0; }

11. Practice 1 Create a new file, type, compile and run the program “hello+ world!!” #include <stdio.h> int main() { printf("hello+ world!!\n"); return 0; }

12. variable

13. variable type printf() and scanf() %c %d %d %ld %f %lf

14. printf() • printf() is for output

15. Creates a variable and prints its value to the screen #include <stdio.h> int main() { intvar; var = 10; printf("The variable var = %d\n", var); return 0; }

16. Practice 2 • Adding Two Numbers #include <stdio.h> int main() { int n1, n2, sum; n1 = 10; n2 = 50; sum = n1 + n2; printf(“ Summation = %d\n”, sum); return 0; }

17. scanf() • scanf() is for input. • Do not forget & in front of variable names.

18. Reads two characters and prints them out in reverse order #include <stdio.h> int main() { char first, second; printf(“Enter 2 characters : ”); scanf(“%c%c”, &first, &second); printf(“%c %c\n”, second, first); return 0; }

19. Practice 3 Adding Two Numbers with getting input from keyboard #include <stdio.h> int main() { int n1, n2, sum; printf(“Enter a Number: “); scanf(“%d”,&n1); printf(“Enter a Number: “); scanf(“%d”,&n2); sum = n1 + n2; printf(“ Summation = %d\n”, sum); return 0; }

20. Exercise • Q1: Create a new file, type, compile and run the program “hello+ world!!” • Q2: Create a new file, type, compile and run the program 2.3 (Adding two numbers) • Q3: Create a new file, type, compile and run the program 2.4 (printf() example) • Q4: Create a new file, type, compile and run the program 2.5 (scanf() example). For each run, test the program with the example input values: • 12 and 20 b. 50 and 80 c. 90 and 100 d. -10 and 1 • Q5: Modify the program in Q4 to the program 2.6 (scanf() example 2). Compile and run the program. For each run, test the program with the example input values: a. 12 and 20 b. 50 and 80 • Q6: Create a new file, type, compile and run the Miles-to-Kilometres conversion program (slide 17, lecture 2). Test with an arbitrary example input value given by the TA.

21. Exercise Do it yourself • Create two variables, give them some value, and print them out to the screen. (See Example 2) • Read in two integers and print them out to the screen. (See Example 3) • Input 3 integers and calculate the summation (See Example 4). • Input 3 integers and print them out in reverse order (See Example 5).