Qsort
qsort is a C standard-library function that sorts an array using a caller-supplied comparison function.
Modern C, Third Edition
qsort is a C standard library function that sorts the elements of an array using a caller-supplied comparison function.
- How it is used
- Deploys qsort as a generic in-place array-sorting interface driven by a caller-supplied ordering function.
- How deep it goes
- Explains parameters, comparator results, type erasure, and overflow safety, but does not describe the sorting algorithm's implementation.
- Examples
- Uses unsigned comparison and contrasts explicit ordering tests with an overflowing integer subtraction comparator.
- What you can do after
- Apply it via the C standard library by supplying correctly sized elements and a consistent, overflow-safe comparator.
Modern C
qsort is a C standard library function that sorts an array using a caller-provided comparison function.
- How it is used
- Sorts arrays generically by combining element metadata with a caller-supplied ordering function.
- How deep it goes
- Defines parameters and comparator rules, then warns about overflow but defers the sorting algorithm’s internals.
- Examples
- Uses unsigned comparison, an invalid subtracting integer comparator, and a type-specific qsort wrapper.
- What you can do after
- Apply it via the C standard library by supplying correctly sized elements and a consistent comparator.
Related concepts
- comparison functionuses · A comparison function or strategy compares two values and indicates their relative ordering, and sometimes whether they are equivalent.
- function pointer typeused by · A function pointer is a value that designates a callable function and can be stored, passed, or invoked indirectly.
- sorting algorithmalternative to · A sorting algorithm is a procedure that rearranges elements of a collection into an order determined by an ordering criterion.
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