string "constant" + valueofvariable;

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I am wondering if there is a way to initialize a string with a constant plus the value of a variable.

Is there a way to do this or do I have use a include file and initialize 100s of 1000s of similar strings

As an exsample:

x=1;             
string "A"+x;//should be the same as:
string A1;
 
Act3297:

I am wondering if there is a way to initialize a string with a constant plus the value of a variable.

Is there a way to do this or do I have use a include file and initialize 100s of 1000s of similar strings

As an exsample:


you should use

"A"+DoubleToStr(x,0)

sn

 
Act3297:
I am wondering if there is a way to initialize a string with a constant plus the value of a variable.
string VARIABLE = "A"+x;

Learn the language THEN code and THEN ask questions.

 

Sorry, I don't think I made my queston clear. I don't want to assign a variable "A"+x, I want to create the variable "A"+x a.k.a A1 so I can assign it a value to it, for example A1=5 so-> 5+StrToDouble(A1)=10. I get an A-variable expected error with-> string "A"+x. I have als tried StringConcatenate but that won't work either.

Does anyone know how to do this?

 
Act3297:

Sorry, I don't think I made my queston clear. I don't want to assign a variable "A"+x, I want to create the variable "A"+x a.k.a A1 so I can assign it a value to it, for example A1=5 so-> 5+StrToDouble(A1)=10. I get an A-variable expected error with-> string "A"+x. I have als tried StringConcatenate but that won't work either.

Does anyone know how to do this?

I understood your question, you are talking about the variable name not it's value, talking about initializing a variable probably sent people off on the wrong direction . . . I don't know for a fact but I suspect that what you want to do isn't possible.

Perhaps if you explain what you are trying to achieve (end result) there may be another way to implement it . . .

 
  1. Sent me off.
  2. If you want a collection of variables, use an array

    initialized to constants:

    int A[] = { 10, 20, 30, 40 }; // A[2] == 30

    non-constants:

    int A[4];
A[0] = 1*10; A[1] = 2*10; A[2] = 3*10; A[3] = 4*10;
  3. If you want given a string set/get a value, create a table with access functions
    SetValue("A", 10); SetValue("B", 20); SetValue("C", 30); SetValue("D", 40);
int v = GetValue("C");  // 30
======================
string  key[];
int     value[];
void SetValue(string key_, int value_){
    int iLimit = ArraySize(key) 
    for (int iKey = 0; iKey < iLimit; iKey++){
        if (key[iKey] == key_){ value[iKey] = value_;   return; }   // Existing
    }
    ArrayResize(key, iLimit+1);     key[iLimit]     = key_;         // New
    ArrayResize(value, iLimit+1);   value[iLimit]   = value_;
}
#define INF 0x6FFFFFFF  // Not quite infinite, Jul 2029, or 1,879,048,191
int GetValue(string key_){
    int iLimit = ArraySize(key) 
    for (int iKey = 0; iKey < iLimit; iKey++){
        if (key[iKey] == key_){ return(value[iKey]);            }   // Existing
    }
    return(INF);                                                    // Not found
}

 

Number 2 might work if I wanted to inialize a bunch of var's at once but I want to avoid that and I also need a way to refer to them later on without the full name. Idealy I want to be able to do this:

static int increasingnumber;
increasingnumber++;
string "A"+increasingnumber;//"A"+increasingnumber doesen't work
string "B"+increasingnumber;//"B"+increasingnumber doesen't work
"A"+increasingnumber=12;
"B"+increasingnumber=235;
if(DoubleToStr("B"+increasingnumber)>otherbumber)
      {
      //something
      }
//I need to replace "A"+increasingnumber with something that works
 

Not sure I understand why you can use arrays . . .

string A[100];  //"A"+increasingnumber doesen't work
string B[100];  //"B"+increasingnumber doesen't work

static int increasingnumber;
increasingnumber++;

A[increasingnumber] = 12;
B[increasingnumber] = 235;
if(DoubleToStr(B[increasingnumber])>otherbumber)
      {
      //something
      }
 

You saved my life RaptorUK, now I don't have to scrap hours of code. I was about to give up on the people of MQL4 forum and was worried there was nothing built in mql4 to do such a seemingly simple thing. Thanks again.

 
Act3297:

You saved my life RaptorUK, now I don't have to scrap hours of code. I was about to give up on the people of MQL4 forum and was worried there was nothing built in mql4 to do such a seemingly simple thing. Thanks again.

It's only the same as what WHRoeder mentioned in his point 2 above . . just arrays . . . they are available in all programming languages I have come across. Glad you have a route to progressing with your code :-)
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