|
//Declaration: void *bsearch(const void *key, const void *buf, size_t num, size_t size, int (*compare)(const void *, const void *));
//Return: returns a pointer to the first member that matches *key.
A null pointer is returned if not found.
//Parameter: The array must be sorted in ascending order.
The number of elements in the array is num.
The size (in bytes) of each element is described by size.
#include <stdlib.h>
#include <ctype.h>
#include <stdio.h>
char *alpha = "abcdefghijklmnopqrstuvwxyz";
int comp(const void *ch, const void *s);
int main(void)
{
char ch;
char *p;
printf("Enter a character: ");
ch = getchar();
ch = tolower(ch);
p = (char *) bsearch(&ch, alpha, 26, 1, comp);
if(p) printf(" %c is in alphabet\n", *p);
else printf("is not in alphabet\n");
return 0;
}
/* Compare two characters. */
int comp(const void *ch, const void *s)
{
return *(char *)ch - *(char *)s;
}
|
