重写 C++代码转换为 Objective C

Question

我有一些 C++ 源代码，我想将其重写为 Objective C。 如果有人能为我编写这段代码的头文件，这将对我有很大帮助。当我获得头文件时，我将能够重写源代码的其余部分。

如果有人能帮助我，那就太好了。

谢谢，

我将在这里发布源代码：

#include <stdlib.h>
#include <iostream.h>

#define STATES 5

int transitionTable[STATES][STATES];

// function declarations:
double randfloat                 (void);
int    chooseNextEventFromTable  (int current, int table[STATES][STATES]);
int    chooseNextEventFromTransitionTablee (int currentState);
void   setTable                  (int value, int table[STATES][STATES]);


//////////////////////////////////////////////////////////////////////////

int main(void) { 
   int i;

   // for demo purposes:
 transitionTable[0][0] = 0;
 transitionTable[0][1] = 20;
 transitionTable[0][2] = 30;
 transitionTable[0][3] = 50;
 transitionTable[0][4] = 0;
 transitionTable[1][0] = 35;
 transitionTable[1][1] = 25;
 transitionTable[1][2] = 20;
 transitionTable[1][3] = 30;
 transitionTable[1][4] = 0;
 transitionTable[2][0] = 70;
 transitionTable[2][1] = 0;
 transitionTable[2][2] = 15;
 transitionTable[2][3] = 0;
 transitionTable[2][4] = 15;
 transitionTable[3][0] = 0;
 transitionTable[3][1] = 25;
 transitionTable[3][2] = 25;
 transitionTable[3][3] = 0;
 transitionTable[3][4] = 50;
 transitionTable[4][0] = 13;
 transitionTable[4][1] = 17;
 transitionTable[4][2] = 22;
 transitionTable[4][3] = 48;
 transitionTable[4][4] = 0;

   int currentState = 0;
 for (i=0; i<10; i++) {
    std::cout << currentState << " ";
      currentState = chooseNextEventFromTransitionTablee(currentState);
   }
   return 0;
};


//////////////////////////////////////////////////////////////////////////


//////////////////////////////
//
// chooseNextEventFromTransitionTable -- choose the next note.
//

int chooseNextEventFromTransitionTablee(int currentState) {
 int targetSum   = 0;
 int sum         = 0;
 int targetNote  = 0;
 int totalevents = 0;
 int i;

 currentState = currentState % STATES;  // remove any octave value
 for (i=0; i<STATES; i++) {
  totalevents += transitionTable[currentState][i];
 }
 targetSum   = (int)(randfloat() * totalevents + 0.5);
 while (targetNote < STATES &&
     sum+transitionTable[currentState][targetNote] < targetSum) {
  sum += transitionTable[currentState][targetNote];
  targetNote++;
 }

 return targetNote;
}





//////////////////////////////
//
// randfloat -- returns a random number between 0.0 and 1.0.
//

double randfloat(void) {
   return (double)rand()/RAND_MAX;
}



//////////////////////////////
//
// setTable -- set all values in the transition table to the given value.
//

void setTable(int value, int table[STATES][STATES]) {
   int i, j;
   for (i=0; i<STATES; i++) {
      for (j=0; j<STATES; j++) {
         table[i][j] = value;
      }
   }
}

更新

我不仅编译头文件，我还编译另一个文件

源代码：

//
//  markovThreadsChainsViewController.m
//  markovThreadsChains
//
//  Created by Philippe Mokrzycki on 15.01.11.
//  Copyright 2011 TGM. All rights reserved.
//

#import "markovThreadsChainsViewController.h"
#import "markov.h"
//#import "markovChainOC.h"

@implementation markovThreadsChainsViewController

@synthesize mcValueLabel, threadStartGenerateButton, threadStopGenerateButton;

- (IBAction) startThreadGen:(UIButton *)sender{
    threadStopGenerateButton.hidden=NO;
    threadStartGenerateButton.hidden=YES;
    mcValueLabel.text = @"0";

    currentState=0;

//  markovChainOC *mCobc = [[markovChainOC alloc]init];

//  [mCobc setCurrentState:0];
    [NSThread detachNewThreadSelector:@selector(startThreading)  toTarget:self withObject:nil];
}

- (IBAction) stopThreadGen:(UIButton *)sender{
    threadStopGenerateButton.hidden=YES;
    threadStartGenerateButton.hidden=NO;
    [NSThread detachNewThreadSelector:@selector(stopThreading) toTarget:self withObject:nil];
}

- (void) startThreading {
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc]init];

    [NSThread sleepForTimeInterval:3];
    [self performSelectorOnMainThread:@selector(markovGen) withObject:nil waitUntilDone:NO];
    [pool release];
}

- (void) stopThreading {
    [NSThread cancelPreviousPerformRequestsWithTarget:self];
}

- (void)markovGen{
    transitionTable[0][0] = 25;
    transitionTable[0][1] = 25;
    transitionTable[1][0] = 25;
    transitionTable[1][1] = 25;

//  int actualValue = [mCobc getCurrentState];

    int actualValue = currentState;
    mcValueLabel.text = [NSString stringWithFormat:@"%", actualValue];
    currentState = chooseNextEventFromTransitionTablee(currentState);
    [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(markovGen) userInfo:nil repeats:NO];

}


/*
// The designated initializer. Override to perform setup that is required before the view is loaded.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])) {
        // Custom initialization
    }
    return self;
}
*/

/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
}
*/


/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
}
*/


/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/

- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}


- (void)dealloc {
    [mcValueLabel release];
    [threadStartGenerateButton release];
    [threadStopGenerateButton release];
//  [mCobc release];
    [super dealloc];
}

@end

Answer 1

这段代码根本没有面向对象的内容。只需将 iostream.h 更改为 stdio.h，并将 cout 更改为 printf 即可。然后就是一个普通的C程序了。

Answer 2

只需将这些行放入头文件中，您就应该能够包含该头并调用任何其他 Objective-C 或 C 源文件中的函数。

（为了也支持 C++，您可能需要在它们周围放置 extern "C" { ... }，除非您将所有内容编译为 C++ 或 Objective-C++。）

#pragma once

#define STATES 5

int transitionTable[STATES][STATES];

// function declarations:
double randfloat                 (void);
int    chooseNextEventFromTable  (int current, int table[STATES][STATES]);
int    chooseNextEventFromTransitionTablee (int currentState);
void   setTable                  (int value, int table[STATES][STATES]);

更多详细信息：

要使用这些函数对于另一个类，您的项目中需要以下文件：

• markov.h（或您决定调用的任何名称），其中包含上面的行。
• markov.c （或者您决定称呼它的任何名称），包含原始源文件中的其他内容，但 main 函数除外，您应该删除该函数

然后，您的使用这些函数的其他文件应该有一个 #include "markov.h" 行，然后您应该能够调用它们。

如果您收到有关缺少函数的链接器错误，则意味着您没有将 markov.c 编译为项目的一部分，或者存在某些选项导致函数名称不正确匹配。