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#include <iostream>
using namespace std;
 
size_t strlen(const char *s){
   const char *sc;
   for(sc = s; *sc != '\0'; ++sc)
 
   return (sc-s);  
}
 
void bad_func( const char * s)
{
	const char * sc = s;
	*sc = 'a'; // error, modifying a const char through sc
 
	// trying to subvert the const-ness with a non-const pointer will fail too
	char * s2 = s; // error, cannot convert const char* to char*;
}
 
int main() {
	// your code goes here
	return 0;
}

prog.cpp: In function ‘void bad_func(const char*)’:
prog.cpp:14:8: error: assignment of read-only location ‘* sc’
  *sc = 'a'; // error, modifying a const char through sc
        ^~~
prog.cpp:17:14: error: invalid conversion from ‘const char*’ to ‘char*’ [-fpermissive]
  char * s2 = s; // error, cannot convert const char* to char*;
              ^

Standard output is empty