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{{cpp/types/numeric_limits/title|digits}}
{{cpp/types/numeric_limits/navbar}}
{{dcl begin}}
{{dcl rev multi|until1=c++11
|dcl1=
static const int digits;
|dcl2=
static constexpr int digits;
}}
{{dcl end}}

The value of {{c|std::numeric_limits<T>::digits}} is the number of digits in base-{{rlp|radix}} that can be represented by the type {{tt|T}} without change. For integer types, this is the number of bits not counting the sign bit and the padding bits (if any). For floating-point types, this is the digits of the mantissa (for {{rlp|is_iec559|IEC 559/IEEE 754}} implementations, this is the number of digits stored for the mantissa plus one, because the mantissa has an implicit leading 1 and binary point).

===Standard specializations===
{{dsc begin}}
{{dsc hitem | {{tt|T}} | value of {{c|std::numeric_limits<T>::digits}}<br>(assuming no [[cpp/language/object#Object representation and value representation|padding bits]])}}
{{dsc | {{c/core|/* non-specialized */}}     | {{c|0}} }}
{{dsc | {{c/core|bool}}              | {{c|1}} }}
{{dsc | {{c/core|char}}              | {{c|1=CHAR_BIT - std::numeric_limits<char>::is_signed}} }}
{{dsc | {{c/core|signed char}}       | {{c|CHAR_BIT - 1}} }}
{{dsc | {{c/core|unsigned char}}     | {{lc|CHAR_BIT}} }}
{{dsc | {{c/core|wchar_t}}           | {{c|1=CHAR_BIT * sizeof(wchar_t)
    - std::numeric_limits<wchar_t>::is_signed}} }}
{{dsc | {{c/core|char8_t}} {{mark since c++20}}  | {{lc|CHAR_BIT}} }}
{{dsc | {{c/core|char16_t}} {{mark since c++11}} | {{c|CHAR_BIT * sizeof(char16_t)}} }}
{{dsc | {{c/core|char32_t}} {{mark since c++11}} | {{c|CHAR_BIT * sizeof(char32_t)}} }}
{{dsc | {{c/core|short}}             | {{c|CHAR_BIT * sizeof(short) - 1}} }}
{{dsc | {{c/core|unsigned short}}    | {{c|CHAR_BIT * sizeof(short)}} }}
{{dsc | {{c/core|int}}               | {{c|CHAR_BIT * sizeof(int) - 1}} }}
{{dsc | {{c/core|unsigned int}}      | {{c|CHAR_BIT * sizeof(int)}} }}
{{dsc | {{c/core|long}}              | {{c|CHAR_BIT * sizeof(long) - 1}} }}
{{dsc | {{c/core|unsigned long}}     | {{c|CHAR_BIT * sizeof(long)}} }}
{{dsc | {{c/core|long long}} {{mark since c++11}}          | {{c|CHAR_BIT * sizeof(long long) - 1}} }}
{{dsc | {{c/core|unsigned long long}} {{mark since c++11}} | {{c|CHAR_BIT * sizeof(long long)}} }}
{{dsc | {{c/core|float}}             | {{lc|FLT_MANT_DIG}} }}
{{dsc | {{c/core|double}}            | {{lc|DBL_MANT_DIG}} }}
{{dsc | {{c/core|long double}}       | {{lc|LDBL_MANT_DIG}} }}
{{dsc end}}

===See also===
{{dsc begin}}
{{dsc inc|cpp/types/numeric_limits/dsc radix}}
{{dsc inc|cpp/types/numeric_limits/dsc min_exponent}}
{{dsc inc|cpp/types/numeric_limits/dsc max_exponent}}
{{dsc end}}

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