Main.cc: In function ‘int main()’: Main.cc:9:23: error: too few arguments to function ‘void* memset(void*, int, size_t)’ memset(dp,0,memset(0)); ^ In file included from /usr/include/features.h:424:0, from /usr/include/x86_64-linux-gnu/c++/7/bits/os_defines.h:39, from /usr/include/x86_64-linux-gnu/c++/7/bits/c++config.h:533, from /usr/include/c++/7/iostream:38, from Main.cc:1: /usr/include/x86_64-linux-gnu/bits/string_fortified.h:59:1: note: declared here __NTH (memset (void *__dest, int __ch, size_t __len)) ^