Strtoul
strtoul is a C standard library function that converts the initial portion of a string to an unsigned long value using a specified or inferred integer base.
Modern C, Third Edition
strtoul is a C standard-library function that converts the initial part of a string to an unsigned long value using an end-pointer and integer-base parameter.
- How it is used
- Converts textual integers, especially command-line strings, while optionally reporting where numeric input ends.
- How deep it goes
- Explains the signature, input parts, bases, end-pointer, and wrapper macros without fully developing conversion internals.
- Examples
- Uses command-line parsing, strtod comparisons, function prototypes, and macros that supply omitted endptr and base arguments.
- What you can do after
- Apply it via the C standard library to parse integer strings with explicit bases or automatic notation detection.
Modern C
strtoul is a C standard library function that converts the initial portion of a string to an unsigned long value in a specified base.
- How it is used
- Converts string representations of integers, including command-line values, into unsigned long results.
- How deep it goes
- Explains parameters, base selection, input parts, and overflow handling, but defers detailed end-pointer use.
- Examples
- Uses command-line length conversion and contrasts omitted defaults with explicit end-pointer and decimal-base arguments.
- What you can do after
- Apply it via the C standard library to parse integer strings with explicit or notation-selected bases.
Related concepts
- strspnuses · strspn is a C standard library function that returns the length of the initial segment containing only characters from a specified string.
- numeric baseuses · A numeric base, or radix, is the positional numeral-system value that determines a numeral’s digit set and the place-value scale of its digits.
- errnouses · errno is a C library macro identifying a modifiable integer error indicator associated with the current thread or execution context.
- default valueconfigured by · A default value is a predefined or automatically supplied value used when an expected input, argument, field, or configuration setting is omitted or unspecified.
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