Convert C++ code do C#

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Can anybody of you help me translate those codes in C++ to C# ?
I have tried different programs (online too) to convert, but neither of them gave me the correct result... Thanks alot

C++

#include <stdio.h> 
#include <stdlib.h>
#define max 100

int isdigit(char ch) {return '0' <= ch && ch <= '9';}
int isoperator(char ch) {return ch == '+' ? 1: -1;}
int ismultsign(char ch) {return ch == '*';}

long eval(char *str)
{
    long val = 0;
    char sign = '+';
    long temp = 0;
    int k = 0;
    char *ptr = str;
    while (*ptr)
        {
            if (isdigit(*ptr))
                temp = temp*10 + *ptr - '0';
            else if(!ismultsign(*ptr))
                {
                    val = val + isoperator(sign)*temp;
                    temp = 0;
                    sign = *ptr;
                }
            ptr ++;
        }
    
    return val + isoperator(sign)*temp;
}

char *insert(char *str)
{
    char *temp = (char *) malloc(2*max);
    char *ptr = str;
    int k = 0;
    while (*ptr)
        {
            k+=2;
            temp[k-2] = *ptr;
            temp[k-1] = '*';
            ptr ++;
        }
    temp[k-1] = 0;
    return temp;
}

char *removemultsign(char *str)
{
    char *temp = (char *) malloc (max);
    char *ptr = temp;
    while (*str)
        {
            if(!ismultsign(*str))
                {
                    *ptr = *str;
                    ptr++;
                }
            str++;
        }
    *ptr = 0;
    return temp;
}


void Try(char *str, int k, int sum)
{   
    if (*(str+k))
        for (int j = 0; j < 3; j++)
            {
                char ch = str[k];
                if (j==1) str[k] = '-';
                else if (j==2) str[k] = '+';
                long num = eval(str);
                if (num == sum) 
                    {
                        char *temp = removemultsign(str);
                        printf("\n%s = %d\n",temp, sum);
                        free (temp);
                    }
                Try(str,k+2,sum);
                str[k] = ch;
            }
}

void main() 
{ 
    char str[] = "123456789";
    char *ptr = insert(str);
    Try(ptr,1,12);
    free (ptr);
}

Posted 16-Aug-11 10:08am

pham.quocduy

Updated 16-Aug-11 11:22am

Philippe Mori

v2

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[no name] 16-Aug-11 16:43pm

Looks like the eval method is just set up to parse the string and run math ops. I would suggest re-writing from scratch since pointers are not necessary to do this in C#.

But maybe that is not why you want it converted.

pham.quocduy 17-Aug-11 11:53am

I really do not understand for example "char *str", "int isdigit(char ch)" or "free (temp)" how it should be in C#

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Philippe Mori · Answer 1 · 2011-08-16T11:54:00

In fact, the code is essentially C code... and it does not make much sense to try to convert as it to C#.

It will be much better to rewrite the program to uses managed types like strings.

A function like removemultsign should be rewritten as:

C#

string removemultsign(string str)
{
    return str.Replace("*", string.Empty);
}

And insert function can be written that way:

C#

string insert(string str)
{
    var builder = new StringBuilder();
    foreach (var ch in str)
    {
        builder.Append(ch);
        builder.Append("*");
    }
    if (builder.Length > 0)
    {
        builder.Remove(builder.Length - 1, 1);
    }
    return builder.ToString();
}

Other methods are left as an exercise for the reader...

TRK3 · Answer 2 · 2011-08-16T10:40:00

Why don't you just compile the code in C++ and run it.

Then you can copy the ouput and paste into your basic C# hello world program:

C#

// Hello1.cs
public class Hello1
{
   public static void Main()
   {
      System.Console.WriteLine("123-45-67-8+9 = 12");
      System.Console.WriteLine("123-4-5-6-7-89 = 12");
      System.Console.WriteLine("123-4-5-6-7-89 = 12");
      System.Console.WriteLine("123+45-67-89 = 12");
      System.Console.WriteLine("123+45-67-89 = 12");
      System.Console.WriteLine("12-3-4-5+6+7+8-9 = 12");
      System.Console.WriteLine("12-3-4+5-6+7-8+9 = 12");
      System.Console.WriteLine("12-3+4-5-6-7+8+9 = 12");
      System.Console.WriteLine("12+3-4+5+6+7-8-9 = 12");
      System.Console.WriteLine("12+3+4-5+6-7+8-9 = 12");
      System.Console.WriteLine("12+3+4+5-6-7-8+9 = 12");
      System.Console.WriteLine("1-2+34-5-6+7-8-9 = 12");
      System.Console.WriteLine("1+2+34+5-6-7-8-9 = 12");
   }
}

The two programs will have identical output, so for all intents and purposes, they will be equivalent.

Philippe Mori · Answer 3 · 2011-08-18T01:38:00

Read a tutorial on the basic of C#. We already give you a lot of hint on how to do it the C# way.

Introduction to C#[^]

Once you will have fully read that tutorial, you will understand the langage much better. If it is not enough, you can read even more...

C# programming guide[^]

C# Station Tutorial[^]

Now some more specific links:

You can read Char.IsNumber[^]

And for free, if you uses managed string, you don't have to worry about freeing memory as it is garbage collected.

char *str is remplaced with the use of string[^]. Do the appropriate changes.

You might first convert C code to uses indexes instead of pointers as the conversion will then be easier. And that way, you would do it "one step at the time".

Convert C++ code do C#

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