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Index: bsearch.3
===================================================================
--- bsearch.3
+++ bsearch.3
@@ -83,6 +83,60 @@
function returns a pointer to a matching member of the array, or a null
pointer if no match is found.
If two members compare as equal, which member is matched is unspecified.
+.Sh EXAMPLES
+A sample program that searches people by age in a sorted array:
+.Bd -literal
+#include <stdio.h>
+#include <stdlib.h>
+
+struct person {
+ char name[5];
+ int age;
+};
+
+int
+compare(const void *key, const void *array_member)
+{
+ int age = (int) key;
+ struct person person = *(struct person *) array_member;
+
+ return (age - person.age);
+}
+
+int
+main()
+{
+ struct person *friend;
+
+ /* Sorted array */
+ struct person friends[6] = {
+ { "paul", 22 },
+ { "anne", 25 },
+ { "fred", 25 },
+ { "mary", 27 },
+ { "mark", 35 },
+ { "bill", 50 }
+ };
+
+ size_t array_size = sizeof(friends) / sizeof(struct person);
+
+ /* returns paul */
+ friend = bsearch((void *)22, &friends, array_size, sizeof(struct person), compare);
+ printf("name: %s\nage: %d\n", friend->name, friend->age);
+
+ /* Unspecified, could be fred or anne. Probably the first found, though */
+ friend = bsearch((void *)25, &friends, array_size, sizeof(struct person), compare);
+ printf("name: %s\nage: %d\n", friend->name, friend->age);
+
+ /* Not found. friend == NULL */
+ friend = bsearch((void *)30, &friends, array_size, sizeof(struct person), compare);
+ if (friend == NULL) {
+ printf("friend aged 30 not found\n");
+ }
+
+ return (EXIT_SUCCESS);
+}
+.Ed
.Sh SEE ALSO
.Xr db 3 ,
.Xr lsearch 3 ,

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