c++ - does a function know how much memory its parameters occupy? -

when call function passing value, making copy in memory of actual parameters' value.

the question is: function know how space parameters occupy in memory? if answers yes, how can retrieve in function scope?

if answers in no, have potentially hidden memory error?

consider example:

#include <stdio.h> void func(char * x) {     x +=98;     *x='c'; //is ok? or have hidden memory error?     *++x='\0';      --x;     puts(x);     }  int main() {     char a[100];     char *b =a;     func(b);     return 0; } 

you have potentially hidden error. don't manually crap use std::string.