Strtoull
strtoull is a C standard library function that converts the initial portion of a string to an unsigned long long value using a specified or inferred integer base.
Modern C, Third Edition
strtoull is a C standard-library function that converts the initial part of a string to an unsigned long long integer using a specified or inferred base.
- How it is used
- Parses numbers from text while exposing the boundary needed to continue scanning a larger input string.
- How deep it goes
- Explains base selection, stopping characters, no-conversion detection, and end-pointer iteration, but not full error-range handling.
- Examples
- Uses repeated line parsing, the input 0789a under several bases, and generated ULLONG_MAX spellings with and without digit separators.
- What you can do after
- Apply it via the C library to parse one number or iterate through multiple numbers using the returned end pointer.
Modern C
strtoull is a C standard library function that converts the initial portion of a string to an unsigned long long value in a specified base and reports where parsing ends.
- How it is used
- Parses a string as a sequence of numbers while preserving each conversion's stopping position.
- How deep it goes
- Explains conversion, bases, end pointers, loop termination, and a const-qualification weakness, but defers broader error handling.
- Examples
- Uses "0789a" in bases 10 and 0, then embeds strtoull in numberline_inner.
- What you can do after
- Apply it via the C standard library to scan successive numeric fields and detect where parsing stops.
Related concepts
- strtoulalternative to · 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.
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