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DASL 130 – C Programming Course

DASL 130 – C Programming Course. Lecture 6. Common Libraries. stdbool.h Provides: true constant = 1 false constant = 0 bool type Use with logical operators. Random Numbers. Random numbers are pseudorandom - there is always an algorithm behind the generation

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DASL 130 – C Programming Course

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  1. DASL 130 – C Programming Course Lecture 6

  2. Common Libraries stdbool.h Provides: • true constant = 1 • false constant = 0 • bool type • Use with logical operators

  3. Random Numbers • Random numbers are pseudorandom - there is always an algorithm behind the generation • #include <stdlib.h> (gives you the rand() and srand() functions) • #include <time.h> (gives you the time() function)

  4. Random Numbers • srand( int ) ○ set the seed – number used as basis for sequence of random numbers ○ same seed = same sequence of numbers ○ default seed is ‘1’ For more random randomness set the seed by: • srand( time(NULL) ) rand() returns in the range from 0 to RAND_MAX

  5. Making A Library - Header Header File (filename.h) • Start with: #ifndef _ID_ #define _ID_ • Add prototypes for all functions in filename.c • If you have type definitions put them in the header • End with #endif

  6. Making A Library - Source Source File (filename.c) • Start with: #ifndef _ID_ #define _ID_ • Add all function definitions (not prototypes) to the middle • End with #endif

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