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Constants, Enumerations and Structures
Named Constants
Numerical Type Constants

Numerical Type Constants

Numerical Type Constants

Each simple numerical type is intended for a certain type of tasks and allows optimizing the operation of a mql5-program when used correctly. For a better code readability and correct handling of calculation results, there are constants which allow to receive information about restrictions set to a certain type of simple data.

ConstantDescriptionValue
CHAR_MINMinimal value, which can be represented by char type-128
CHAR_MAXMaximal value, which can be represented by char type127
UCHAR_MAXMaximal value, which can be represented by uchar type255
SHORT_MINMinimal value, which can be represented by short type-32768
SHORT_MAXMaximal value, which can be represented by short type32767
USHORT_MAXMaximal value, which can be represented by ushort type65535
INT_MINMinimal value, which can be represented by int type-2147483648
INT_MAXMaximal value, which can be represented by int type2147483647
UINT_MAXMaximal value, which can be represented by uint type4294967295
LONG_MINMinimal value, which can be represented by long type-9223372036854775808
LONG_MAXMaximal value, which can be represented by long type9223372036854775807
ULONG_MAXMaximal value, which can be represented by ulong type18446744073709551615
DBL_MINMinimal positive value, which can be represented by double type2.2250738585072014e-308
DBL_MAXMaximal value, which can be represented by double type1.7976931348623158e+308
DBL_EPSILONMinimal value, which satisfies the condition:
1.0+DBL_EPSILON != 1.0 (for double type)		2.2204460492503131e-016
DBL_DIGNumber of significant decimal digits for double type15
DBL_MANT_DIGNumber of bits in a mantissa for double type53
DBL_MAX_10_EXPMaximal decimal value of exponent degree for double type308
DBL_MAX_EXPMaximal binary value of exponent degree for double type1024
DBL_MIN_10_EXPMinimal decimal value of exponent degree for double type(-307)
DBL_MIN_EXPMinimal binary value of exponent degree for double type(-1021)
FLT_MINMinimal positive value, which can be represented by float type1.175494351e-38
FLT_MAXMaximal value, which can be represented by float type3.402823466e+38
FLT_EPSILONMinimal value, which satisfies the condition:
1.0+DBL_EPSILON != 1.0 (for float type)		1.192092896e–07
FLT_DIGNumber of significant decimal digits for float type6
FLT_MANT_DIGNumber of bits in a mantissa for float type24
FLT_MAX_10_EXPMaximal decimal value of exponent degree for float type38
FLT_MAX_EXPMaximal binary value of exponent degree for float type128
FLT_MIN_10_EXPMinimal decimal value of exponent degree for float type-37
FLT_MIN_EXPMinimal binary value of exponent degree for float type(-125)

Example:

void OnStart()
  {
//--- print the constant values
   printf("CHAR_MIN = %d",CHAR_MIN);
   printf("CHAR_MAX = %d",CHAR_MAX);
   printf("UCHAR_MAX = %d",UCHAR_MAX);
   printf("SHORT_MIN = %d",SHORT_MIN);
   printf("SHORT_MAX = %d",SHORT_MAX);
   printf("USHORT_MAX = %d",USHORT_MAX);
   printf("INT_MIN = %d",INT_MIN);
   printf("INT_MAX = %d",INT_MAX);
   printf("UINT_MAX = %u",UINT_MAX);
   printf("LONG_MIN = %I64d",LONG_MIN);
   printf("LONG_MAX = %I64d",LONG_MAX);
   printf("ULONG_MAX = %I64u",ULONG_MAX);
   printf("EMPTY_VALUE = %.16e",EMPTY_VALUE);
   printf("DBL_MIN = %.16e",DBL_MIN);
   printf("DBL_MAX = %.16e",DBL_MAX);
   printf("DBL_EPSILON = %.16e",DBL_EPSILON);
   printf("DBL_DIG = %d",DBL_DIG);
   printf("DBL_MANT_DIG = %d",DBL_MANT_DIG);
   printf("DBL_MAX_10_EXP =  %d",DBL_MAX_10_EXP);
   printf("DBL_MAX_EXP = %d",DBL_MAX_EXP);
   printf("DBL_MIN_10_EXP = %d",DBL_MIN_10_EXP);
   printf("DBL_MIN_EXP = %d",DBL_MIN_EXP);
   printf("FLT_MIN = %.8e",FLT_MIN);
   printf("FLT_MAX = %.8e",FLT_MAX);
   printf("FLT_EPSILON = %.8e",FLT_EPSILON);
/*
   CHAR_MIN = -128
   CHAR_MAX = 127
   UCHAR_MAX = 255
   SHORT_MIN = -32768
   SHORT_MAX = 32767
   USHORT_MAX = 65535
   INT_MIN = -2147483648
   INT_MAX = 2147483647
   UINT_MAX = 4294967295
   LONG_MIN = -9223372036854775808
   LONG_MAX = 9223372036854775807
   ULONG_MAX = 18446744073709551615
   EMPTY_VALUE = 1.7976931348623157e+308
   DBL_MIN = 2.2250738585072014e-308
   DBL_MAX = 1.7976931348623157e+308
   DBL_EPSILON = 2.2204460492503131e-16
   DBL_DIG = 15
   DBL_MANT_DIG = 53
   DBL_MAX_10_EXP =  308
   DBL_MAX_EXP = 1024
   DBL_MIN_10_EXP = -307
   DBL_MIN_EXP = -1021
   FLT_MIN = 1.17549435e-38
   FLT_MAX = 3.40282347e+38
   FLT_EPSILON = 1.19209290e-07
*/
  }
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Mathematical ConstantsUninitialization Reason Codes