c++ i want to concat char but i get an segmentation fault -

i have short question how concat these char in c++. segmentation fault

struct dirent *ent const char *filepath = strcat("/test/",ent->d_name) ; 

the c way concatenate strings this:

char buf[128]; strcpy(buf, "first string"); strcat(buf, "second string"); 

first allocate space hold concatenated strings. copy first string buffer. concatenate second string onto first.

but since you're using c++, should use std::string instead of str* functions.

std::string j = "hello"; j += " there";