// file: lecture_07/example.cc
//

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

// method: main
//
// main program starts here
//
int main(int argc, char** argv) {

  // grab the command line arguments
  //
  long i = atoi(argv[1]);
  long j = atoi(argv[2]);
  fprintf(stdout, "program name = %s\n", argv[0]);
  fprintf(stdout, "argv[1] = %d\n", i);
  fprintf(stdout, "argv[2] = %d\n", j);

  // do some math
  //

  long k = i + j;
  fprintf(stdout, "k [%d] = i [%d] + j [%d]\n", k, i, j);

  long l = i - j;
  fprintf(stdout, "l [%d] = i [%d] - j [%d]\n", l, i, j);

  long m = i * j;
  fprintf(stdout, "m [%d] = i [%d] * j [%d]\n", m, i, j);

  long n = i / j;
  fprintf(stdout, "n [%d] = i [%d] / j [%d]\n", n, i, j);

  k = i + j + j + j + j - i - j + i + j + j;
  fprintf(stdout, "new value of k = %d\n", k);

  k = (i * j) + i;
  fprintf(stdout, "mult/add: new value of k = %d\n", k);

  k = i * (j + i);
  fprintf(stdout, "mult/add: new value of k = %d\n", k);

  // let's do some floats
  //
  float arg1 = atof(argv[1]);
  float arg2 = atof(argv[2]);
  fprintf(stdout, "program name = %s\n", argv[0]);
  fprintf(stdout, "argv[1] = %f\n", arg1);
  fprintf(stdout, "argv[2] = %f\n", arg2);

  // all float calculations
  //
  float sum = arg1 + arg2;
  fprintf(stdout, "sum = %f\n", sum);  

  // mixed calculations: use casting!
  //
  long z = 27;
  float zz = (float)z / arg1;
  fprintf(stdout, "zz [%f] = i [%d] / arg1 [%f]\n", zz, z, arg1);

  // exponentiation
  //
  sum = pow(arg1, arg2);
  fprintf(stdout, "pow(%f, %f) = %f\n", arg1, arg2, sum);

  // modulo operator
  //
  fprintf(stdout, "%d %% %d = %d\n", i, j, i % j);
  fprintf(stdout, "%d %% %d = %d\n", -i, -j, -i % -j);
  fprintf(stdout, "%d %c %d = %d\n", j, '%', i, j % i);
  fprintf(stdout, "%d %c %d = %d\n", -j, '%', -i, -j % -i);

  // increment and decrement
  //
  long inc_i;
  fprintf(stdout, "i before = %d\n", i);
  inc_i = ++i + 3;
  fprintf(stdout, "inc_i after = %d\n", inc_i);

  i = 1;
  fprintf(stdout, "i after = %d\n", i);
  inc_i = i++ + 3;
  fprintf(stdout, "inc_i after = %d\n", inc_i);

  --i;
  fprintf(stdout, "i after = %d\n", i);
  i--;
  fprintf(stdout, "i after = %d\n", i);

  // equivalents
  //
  long iiii =0;
  iiii += arg1;
  long jjjj =0;
  jjjj -= arg1;

  long acc = 0;
  for (long alex = 0; alex < 10; alex++) {
    acc += alex;
    fprintf(stdout, "(%d): %d\n", alex, acc);
  }

  for (long alex = 10; alex > 0; alex--) {
    acc -= alex;
    fprintf(stdout, "(%d): %d\n", alex, acc);
  }

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