c++ - Why is std::cin outputting whatever is given to it? -

i've been working on learning c++, , 1 of first steps learning input , output. however, i've encountered issue where, when call std::cin , use put returned information variable, prints out whatever given it, whatever printed out on same line. code:

#include <iostream>  int main() {     using std::cout;     using std::cin;     using std::endl;     cout << "hello world" << endl;     cout << "testing ";     int x;     cin >> x;     cout << x;     return 0; } 

returns:

c:\users\...\learncpp.exe hello world testing this5 testing 5 5 process finished exit code 0 

it's noteworthy when entered 5, directly next this, in "this5", though there should space there. then, once hit enter, prints out should look, "this 5".

i've tried without space , same, , i've tried newline after "testing ", , prints 5 twice:

c:\users\...\learncpp.exe hello world testing 5 5 5 process finished exit code 0 

i've scoured internet looking why, , i'm @ wits end. i'm using clion mingw , cmake. cmakelists.txt file looks like:

cmake_minimum_required (version 3.2) project (learncpp)  set(cmake_cxx_flags "${cmake_cxx_flags} -std=c++11")  set(source_files main.cpp) add_executable(learncpp ${source_files}) 

can see i'm doing wrong, or might wrong setup?