// file: /data/courses/ece_1111/current/lectures/lecture_10
//
// Description...
//

// local include files
//
#include "example.h"

// function: main
//
// This is a simple program that prints to the terminal.
//
int main(int argc, const char** argv) {

  // define a floating-point variable that is set from the command line
  //
  float sum = atof(argv[1]);
  //printf("program name: %s, sum = %f\n", argv[0], sum);
  fprintf(stdout, "program name: %s, sum = %10.4f\n", argv[0], sum);

  // define an integer
  //
  long i = 27;
  int j = 9;
  int k = 27;

  char c = 'a';
  char* str = (char*)"this is a string";

  // formatted I/O - different format specifications
  //
  printf("easy: the value of i is %7d\n", i);
  printf("easy: the value of i is %10d\n", i);
  printf("easy: the value of i is %15d\n", i);
  fprintf(stdout, "hard: the value of i is %7d (j = %7d)\n", i, j);

  // define a floating-point number
  //
  sum = 27.2727272727;
  fprintf(stdout, "the value of sum is %f\n", sum);
  fprintf(stdout, "the value of sum is %10.4f\n", sum);
  fprintf(stdout, "the value of sum is %10.1f\n", sum);

  // doing math 'inline'
  //
  fprintf(stdout, "the value of sum is %f\n", sum + 999);
  fprintf(stdout, "the value of sum is %10.2f\n", (float)1.0);
  fprintf(stdout, "the value of sum is %10.2f\n", (float)999);
  fprintf(stdout, "the value of sum is %10.2f\n", sum);
  fprintf(stdout, "the value of sum is %15.4e\n", sum);
  fprintf(stdout, "i = %d, sum = %f\n", i, sum);
  fprintf(stdout, "i (%d), sum = (%f)\n", i, sum);

  fprintf(stdout, "********\n");
  fprintf(stdout, "%s [%s]\n", "our first string", "today is Wednesday");
  fprintf(stdout, "[%20.20s]\n", "1234567890");
  fprintf(stdout, "[%20.20s]\n", "123");
  fprintf(stdout, "[%.20s] [%.20s]\n", "1234567890", "123");
  fprintf(stdout, "[%.20s]\n", "123");
  fprintf(stdout, "[%s]\n", "1234567890");

  fprintf(stdout, "hello world\n");
  fprintf(stdout, "hello Joe\n");
  fprintf(stdout, "my program name is [%s]\n", argv[0]);
  fprintf(stdout, "my first command line argument is [%s]\n", argv[1]);
  fprintf(stdout, "the number of arguments is [%d]\n", argc);

  // more advanced print using pointers
  //
  const char* ptr = "My name is Joe";
  fprintf(stdout, "%s\n", ptr);
  
  // command line arguments
  //
  fprintf(stdout, "number of arguments = %d\n", argc);
  fprintf(stdout, "first command line argument:  [%s]\n", argv[0]);
  fprintf(stdout, "second command line argument: [%s]\n", argv[1]);
  fprintf(stdout, "third command line argument: [%s]\n", argv[2]);  

  // exit gracefully
  //
  return(0);
}