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bsearch

De cppreference.com
< c‎ | algorithm

Defined in header <stdlib.h>
void* bsearch( const void* key, const void* ptr, size_t count, size_t size,
               int (*comp)(const void*, const void*) );
Busca un elemento igual al elemento al que apunta key en un array apuntado por ptr. La matriz contiene elementos count de size tamaño. Función a la que apunta comp se utiliza para la comparación de objetos .
Original:
Finds an element equal to element pointed to by key in an array pointed to by ptr. The array contains count elements of size size. Function pointed to by comp is used for object comparison.
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Contenido

[editar] Parámetros

key -
puntero al elemento a buscar
Original:
pointer to the element to search for
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ptr -
puntero a la matriz a examinar
Original:
pointer to the array to examine
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count -
número de elemento de la matriz
Original:
number of element in the array
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size -
tamaño de cada elemento de la matriz en bytes
Original:
size of each element in the array in bytes
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comp - comparison function which returns ​a negative integer value if the first argument is less than the second,

a positive integer value if the first argument is greater than the second and zero if the arguments are equal. key is passed as the first argument, an element from the array as the second.
The signature of the comparison function should be equivalent to the following:

 int cmp(const void *a, const void *b);

The function must not modify the objects passed to it.

[editar] Valor de retorno

puntero al elemento encontrado o NULL de otra manera .
Original:
pointer to the found element or NULL otherwise.
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[editar] Ejemplo

#include <stdlib.h>
#include <stdio.h>
 
struct data {
  int nr;
  char const *value;
} dat[] = {
  {1, "Foo"}, {2, "Bar"}, {3, "Hello"}, {4, "World"}
};
 
int data_cmp(void const *lhs, void const *rhs) {
  struct data const *const l = lhs;
  struct data const *const r = rhs;
  return l->nr < r->nr;
}
 
int main(void) {
  struct data key = { .nr = 3 };
  struct data const *res = bsearch(&key, dat, sizeof(dat)/sizeof(dat[0]),
                                   sizeof(dat[0]), data_cmp);
  if(!res) {
    printf("No %d not found\n", key.nr);
  }
  else {
    printf("No %d: %s\n", res->nr, res->value);
  }
}

Output:

No 3: Hello

[editar] Ver también

Ordena un intervalo de elementos con tipo no especificado
Original:
sorts a range of elements with unspecified type
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(función) [edit]
C++ documentation for bsearch