Problem asigning value to array

[pacman992]

i dont know why but it always return zero, help

double test_array[];
int i;
i=1;

int init(){
return (0);
}

int start(){

test_array[i]=3.2;
alert("value = "+ test_array[i]);

return (0);
}

int deinit{
return (0);
}

[honest_knave]

Your array has no size, so it contains no elements.

If you specify i=1, that is the second element (0 would be the index of the first element).

So your array size must be at least 2 for your code to work.

[pacman992]

honest_knave:

Your array has no size, so it contains no elements.

If you specify i=1, that is the second element (0 is the first).

So your array size must be at least 2 for your code to work.

 

sorry what do u mean with array size? could you make an example? 

[honest_knave]

An array needs a size. It could be 1, 10, 15, 37 or whatever number takes your fancy. But it can't be unspecified.

double test_array[]; // this has no size

double test_array[2]; // this has 2 elements

double test_array[];
ArrayResize(test_array,5); // this has 5 elements

 

You can read more about Arrays in MQL4 here. 

 

As a tip, I recommend you use this at the top of your code. It would have shown you your problem in the Experts log (Array out of range error).

#property strict

[pacman992]

honest_knave:

An array needs a size. It could be 1, 10, 15, 37 or whatever number takes your fancy. But it can't be unspecified.

 

You can read more about Arrays in MQL4 here. 

 

As a tip, I recommend you use this at the top of your code. It would have shown you your problem in the Experts log (Array out of range error).

 

thank you sir, you help me a lot

[honest_knave]

My pleasure, I'm glad it helped.