memchr() prototype
const void* memchr( const void* ptr, int ch, size_t count ); void* memchr( void* ptr, int ch, size_t count );
The
memchr() function takes three arguments: ptr, ch and count.
It first converts ch to unsigned char and locates its first occurrence in the first count characters of the object pointed to by ptr.
It is defined in <cstring> header file.
memchr() Parameters
ptr: Pointer to the object to be searched for.
ch: Character to search for.
count: Number of character to be searched for.
memchr() Return value
If the character is found, the
memchr() function returns a pointer to the location of the character, otherwise returns null pointer.
Example: How memchr() function works
#include <cstring> #include <iostream> using namespace std; int main() { char ptr[] = "This is a random string"; char ch = 'r'; int count = 15; if (memchr(ptr,ch, count)) cout << ch << " is present in first " << count << " characters of \"" << ptr << "\""; else cout << ch << " is not present in first " << count << " characters of \"" << ptr << "\""; return 0; }
When you run the program, the output will be:
r is present in first 15 characters of "This is a random string"