Software tools for structuring complex program, Programming Languages

Assignment Help:

This assignment begins software tools and techniques for structuring complex programs. Use it to become familiar with these facilities, and ensure you use the speci?ed concepts in your assignment solution.

1. Run the following C++ program with and without preprocessor variable POSTFIX de?ned.

#include
using namespace std;
extern "C" int atoi( const char *str );
struct Node {
int i, j, k;
Node() {}
};
int main( int argc, char *argv[ ] ) {
int times = 10000;
switch ( argc ) {
case 2:
times = atoi( argv[1] );
} // switch
vector v( 10000 );
vector::iterator vi;
volatile int j = 0; // ignore, prevent loop elimination
for ( int i = 0; i < times; i += 1 ) {
for ( vi = v.begin(); vi != v.end();
#ifdef POSTFIX
vi ++
#else
++ vi
#endif
) {
j += 1; // ignore, prevent loop elimination
}
}

Compare the two versions of the program with respect to performance by doing the following:

  • Time the execution using the time command:

% time ./a.out

3.21u 0.02s 0:03.32 100.0%

(Output from time differs depending on your shell, but all provide user, system and real time.) Compare the user time (3.21u), which is the CPU time consumed solely by the execution of user code (versus system and real time).

  • Use the program command-line argument (if necessary) to adjust the number of times the experiment is performed to get execution times in the range 0.1 to 100 seconds. (Timing results in the range of .000001 to .01 seconds are inaccurate.) Use the same command-line value for all experiments.
  • Run both the experiments again after recompiling the programs with compiler optimization turned on (i.e., compiler ?ag -O2). Include all 4 timing results to validate your experiments.
  • Explain the relative differences in the timing results with respect to pre?x and post?x increment of a vector iterator.
  • Does compiler optimization affect either version? (Yes/No answer)
  • Give at least one URL from the web that disagrees with your conclusion

Related Discussions:- Software tools for structuring complex program

Write a program that lets the user play an adventure game, Let the player (...

Let the player (denoted U in the diagram below) navigate around the board until she wins the game by finding the exit or is killed by a monster. A player begins the game with a sli

Define a prolog predicate that asserts list, Define a Prolog predicate flat...

Define a Prolog predicate flatten(List, FlattenedList)  that asserts List  is any nested list of atoms and  FlattenedList  is the same list with the nesting removed. The atom [] sh

Define the control statements in computer programming, Define the Control s...

Define the Control statements in Computer Programming? The statements are part of the program that performs some action. The compiler will check a program sequentially from the

Program for connect 4 game on a general board, The classical connect-4 game...

The classical connect-4 game is played on a 67 board, it can in fact be played in any nrRowsnrCols board. In your implementation, the user will specify the number of rows nrRows an

Java swing, Expertsmind brings you unique solution in java assignments ...

Expertsmind brings you unique solution in java assignments Swing Move is the primary Java GUI gadget tool set. It is part of Oracle's Java Groundwork Sessions (JFC) - an A

Reader-writer problem, The reader-writer problem can be stated as follows: ...

The reader-writer problem can be stated as follows: A shared memory location can be concurrently read by any number of tasks, but when a task must write to the shared memory locati

Random number generator guessing game, The GuessingGame class contains a sk...

The GuessingGame class contains a skeleton for a program to play a guessing game with the user. The program should randomly generate an integer between 1 and 10 and then ask the us

A traveler wants to purchase a number of traveler''s checks, A traveler wan...

A traveler wants to purchase a number of traveler''s checks, each having a set amount for four different currencies: Mexican pesos, Euro dollars, Swiss francs, and US dollars. A t

Program to produce the given output , Given a file named maze1.txt whose co...

Given a file named maze1.txt whose contents is 1 0 2 2 1 2 3 0 3 2 2 1 2 0 2 2 3 0 1 1 3 1 0 0 2 0 3 0 0 1 2 0 3 2 2 0 1 2 3 2 1 0 0 1 1 0 0 0 your program when run as a.out

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd