6.1 Getting Started

6.1 Getting Started

• Get textbook(s).
• Review Chapter 1, page 1, "Overview of Computers and Programming".
• Review Chapter 3, page 55, "Top-Down Design with Functions".
• Read Chapters 2, page 33-94, "Overview of C".
• Setup or find an ANSI C Compiler to use.
• Run several programs.

6.1.1 Getting Started -- Programs

1. hello.c

   
   /* Program to print "hello, world"                  */ 
   /* L Taber   October 13, 1992   PCC                 */
   /* Kernighan & Richie "The C Programming Language"  */ 
   /* Copyright 1978  page 6                           */
   
   #include <stdio.h> 
   
   main() 
   { 
   printf("hello, world\n"); 
   }
   

   When you run it is should look like this:

   hello, world
   

2. limits.c

   /*H*****************************************
    * limits.c   
    * Louis Taber, PCC, Dec 14, 2000
    *******************************************/
   
   #include <limits.h>
   
   main()
   {
   printf( "Minimum and maximun values for"
           " various types.\n\n" );
   printf( "%d <= char <= %d\n", CHAR_MIN, CHAR_MAX );
   printf( "0 <= uchar <= %u\n", UCHAR_MAX );
   printf( "%d <= short <= %d\n", SHRT_MIN, SHRT_MAX );
   printf( "0 <= ushort <= %u\n", USHRT_MAX );
   printf( "%d <= int <= %d\n", INT_MIN, INT_MAX );
   printf( "0 <= uint <= %u\n", UINT_MAX );
   printf( "%ld <= long <= %ld\n", LONG_MIN, LONG_MAX );
   printf( "0 <= ulong <= %lu\n\n", ULONG_MAX );
    
   }
   

   When you run it is should look something like this:

   Minimum and maximun values for various types.
   
   -128 <= char <= 127
   0 <= uchar <= 255
   -32768 <= short <= 32767
   0 <= ushort <= 65535
   -2147483648 <= int <= 2147483647
   0 <= uint <= 4294967295
   -2147483648 <= long <= 2147483647
   0 <= ulong <= 4294967295
   
   

   Please note the limits of your compiler!

3. modular program with math functions.

   Run the following 2 module program with a header.

   I compile it with the following command:

   gcc -o mod mod-main.c mod-sub.c -lm
   

   /*H******************************************************
    *   Program to check out development environment 
    * 
    * Louis Taber
    * December 5, 2000
    * CIS265
    *
    * mod-main.c
    *
    ********************************************************/
   
   #include <stdio.h>
   #include <math.h>
   #include "mod.h" 
   
   float sinandcos( float, float);
   int   iadd(int, int);
   
   int main(void)
   {
   int   a, b = CONSTANT_B, c = CONSTANT_C;
   float x, y = CONSTANT_Y, z = CONSTANT_Z;
   
   /* Print out header */
   
   printf("Your-name\n");
   printf("CIS 265 - Spring 2001 - Taber Lab - 4.1\n\n"); 
   
   /* Integer subroutine and constants */ 
   
   printf("b= %d, %08X    c= %d,  %0o\n", b, b, c, c);    
   a = iadd(b,c);
   printf("a = %07d\n\n",a);
   
   /* Floating point subroutine and constants */ 
   
   printf("y= %f, %18.12g\nz= %f, %18.12g\n\n", y, y, z, z);    
   x = sinandcos(y,z);
   printf("x=%+18.12lg\n", x);
   
   return 0;
   }
   
   

   and

   /*H******************************************************
    *   Program to check out development environment 
    * 
    * Louis Taber
    * December 5, 2000
    * CIS265
    *
    * mod-sub.c
    *
    ********************************************************/
   
   #include <math.h>
   
   int 
   iadd(int b, int c)
   {
   return b+c;
   }
   
   float
   sinandcos(float y, float z)
   {
   return sin( y ) + cos( z );
   }
   

   and

   /*H******************************************************
    *   Program to check out development environment 
    * 
    * Louis Taber
    * December 5, 2000
    * CIS265
    *
    * mod.h
    *
    ********************************************************/
   
   #define CONSTANT_B 12 
   #define CONSTANT_C 18
   #define CONSTANT_Y 1.1111111111111111111111
   #define CONSTANT_Z 2.2222222222222222222222
   
   

   My output looks like:

   Your-name
   CIS 265 - Spring 2001 - Taber Lab - 4.1
   
   b= 12, 0000000C    c= 18,  22
   a = 0000030
   
   y= 1.111111,      1.11111116409
   z= 2.222222,      2.22222232819
   
   x=    +0.28987121582
   

6.1 Getting Started