MQL4 Reference 
Conversion functions DoubleToStr
| string DoubleToStr( |
double value, int digits) |
Returns text string with the specified numerical value converted into a specified precision format.
Parameters:
| value |
- |
Floating point value. |
| digits |
- |
Precision format, number of digits after decimal point (0-8). |
Sample:
string value=DoubleToStr(1.28473418, 5);
// the value is "1.28473"
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