How can I get the length of the buffer in the function using pointers?
#include <stdio.h> #include <stdlib.h> void fun(char *(buffer)) { printf(strlen(buffer)); } int main() { char buffer[] = "Hello"; fun(&buffer); return 0; } 1 Answer
You need to include the header
#include <string.h> then in the function to write
void fun(char *buffer) { printf( "%zu\n", strlen( buffer ) ); } or
void fun(char *buffer) { size_t n = strlen( buffer ); printf( "%zu\n", n ); } and at last to call the function like
fun( buffer ); If you need to get the length of the passed string within the function yourself without using the standard string function strlen then the function can look like
void fun(char *buffer) { const char *p = buffer; while ( *p ) ++p; size_t n = p - buffer; printf( "%zu\n", n ); } answered Sep 13, 2022 at 14:25
Vlad from Moscow
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bufferis already a pointer, so&is not necessary in this example.printf(strlen(buffer));.