1 / 16

Lab3

Lab3. EECE 351 Spring 2000 Section 1 Lecture # 7. Overview. Introduction More I/O Lab Homework What we know Where we are going. Introduction. Help clear up some I/O issues Continue to provide I/O options C++ streams only I/O lab I/O Homework (Builds on the lab). More I/O.

magee-stanley
Download Presentation

Lab3

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Lab3 EECE 351 Spring 2000 Section 1 Lecture # 7 EECE 351 – Lecture 7

  2. Overview • Introduction • More I/O • Lab • Homework • What we know • Where we are going EECE 351 – Lecture 7

  3. Introduction • Help clear up some I/O issues • Continue to provide I/O options • C++ streams only • I/O lab • I/O Homework (Builds on the lab) EECE 351 – Lecture 7

  4. More I/O • cout << nX << nY << nZ << endl; • Prints normally, but happens this way: • nZ is stored in buffer first, then nY, then nX. Usually this is not a problem, but be wary. • Another way to put it (MSDN): EECE 351 – Lecture 7

  5. More I/O (cont.) • How do you point a char*’s value (memory location)? • Type-cast it to void* 1st • void*? – Granddaddy of all pointers • Can be type casted to any other pointer type. • To help, What does this do? char* szTemp = "Hello"; cout << szTemp << endl; //Hello cout << *szTemp << endl; //H cout << &szTemp << endl; //Pointer’s pos cout << (void*) szTemp << endl; //Hello’s pos EECE 351 – Lecture 7

  6. More I/O (cont.) • Manipulator options: • dec, oct, hex – set base number to print • Setbase accepts (10, 8, or 16) • Precision/setprecision (allows you to specify # of trailing digits)—pass # sets to that, nothing passed returns current state • Showpoint – specifies to print “.” or not. • Setw/width – amount of space to set aside for output. • fill() – returns current fill char. fill(char) sets current fill char. EECE 351 – Lecture 7

  7. More I/O (cont.) • More Manipulator options: • left, right, internal -- justification flags. • setf(flag) – turns on passed flag. • unsetf(flag) – turns off passed flag. • Don’t forget <iomanip.h> • Just another way to do the same thing. EECE 351 – Lecture 7

  8. Lab • This lab will introduce an integer parser. • Download to c:\temp\YOURNAME\Lab3 • Open .dsw file • Build application. Any errors? • Execute application. Any errors? Why? • Add Input.txt to project & Project settings (Alt-F7). • See next slides. EECE 351 – Lecture 7

  9. Lab (cont.) EECE 351 – Lecture 7

  10. Lab (cont.) EECE 351 – Lecture 7

  11. Lab (cont.) • Place a breakpoint on the first cout statement. Begin the debugger. • Press F-11 to go into Init. What is argc’s value? Is file correctly openend? • Step into ParseInput. Place cursor inside: elseif ((ch == '-') && (g_nValue == 0)) • What line of input file brings you here? • Step into DisplayError. What happens? EECE 351 – Lecture 7

  12. Lab (cont.) • Continue walking until you understand the lab. Then, terminate debugger. • Switch to Input.txt (FileView). Add 5682 WITH NO CARRIAGE RETURN! Execute program. Does it print the number to the screen? • Add 123d45 after above number WITH NO CARRIAGE RETURN! Execute program. What happens? EECE 351 – Lecture 7

  13. Homework • Read D&D 11 & 14. MMM 6 & 7. • Take today’s lab and convert it into a floating point parser. • Specifications: • Only one complete # per line of input file. • Each number allowed is to have at most one decimal point. • Only allow 4 digits after “.” Either truncate (and inform user) or print error • Display line # of text file in each msg. EECE 351 – Lecture 7

  14. Homework (cont.) • Specifications (cont.): • Don’t allow errors to affect any other parses • Identify which line contains EOF. Print correct message for entry. • Deliverables (In .zip file): • Time & Defects template • .pas file • .cpp (coding standard & COMMENTS) • .exe • Due 2/17/00 Before class starts. EECE 351 – Lecture 7

  15. What we know • More I/O • An Integer Parser EECE 351 – Lecture 7

  16. Where we are going • Lecture – Software Engineering. Read all required chapters of MMM! • No Lab • Review • Midterm (Yuck!) EECE 351 – Lecture 7

More Related