Numerical Type Constants

Each simple numerical type is intended for a certain type of tasks and allows optimizing the operation of a mql4-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.

1.0+DBL_EPSILON != 1.0 (for double type) | 2.2204460492503131e-016 | | DBL_DIG | Number of significant decimal digits for double type | 15 | | DBL_MANT_DIG | Number of bits in a mantissa for double type | 53 | | DBL_MAX_10_EXP | Maximal decimal value of exponent degree for double type | 308 | | DBL_MAX_EXP | Maximal binary value of exponent degree for double type | 1024 | | DBL_MIN_10_EXP | Minimal decimal value of exponent degree for double type | (-307) | | DBL_MIN_EXP | Minimal binary value of exponent degree for double type | (-1021) | | FLT_MIN | Minimal positive value, which can be represented by float type | 1.175494351e-38 | | FLT_MAX | Maximal value, which can be represented by float type | 3.402823466e+38 | | FLT_EPSILON | Minimal value, which satisfies the condition:

1.0+DBL_EPSILON != 1.0 (for float type) | 1.192092896e–07 | | FLT_DIG | Number of significant decimal digits for float type | 6 | | FLT_MANT_DIG | Number of bits in a mantissa for float type | 24 | | FLT_MAX_10_EXP | Maximal decimal value of exponent degree for float type | 38 | | FLT_MAX_EXP | Maximal binary value of exponent degree for float type | 128 | | FLT_MIN_10_EXP | Minimal decimal value of exponent degree for float type | -37 | | FLT_MIN_EXP | Minimal 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);
  }