linux命令如下：valgrind --tool=memcheck --leak-check=full ./a.out
若没有valgrind工具，ubuntu下需要sudo apt-get install valgrind

 #include <iostream>

 using namespace std;

 int main(int argc, char *argv[])

 {

     string* s = new string("hello world");

     cout<<*s<<endl;

     int* m = new int();

     cout<<*m<<endl;

     delete m;

     return ;

 }

 //running:

 nol@nol-VirtualBox:~/desktop$ valgrind --tool=memcheck --leak-check=full ./a.out

 ==== Memcheck, a memory error detector

 ==== Copyright (C) -, and GNU GPL'd, by Julian Seward et al.

 ==== Using Valgrind-3.11. and LibVEX; rerun with -h for copyright info

 ==== Command: ./a.out

 ====

 hello world

 ====

 ==== HEAP SUMMARY:

 ====     in use at exit: , bytes in  blocks

 ====   total heap usage:  allocs,  frees, , bytes allocated

 ====

 ====  bytes in  blocks are definitely lost in loss record  of

 ====    at 0x4C2E0EF: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)

 ====    by 0x400C40: main (in /home/nol/desktop/a.out)

 ====

 ==== LEAK SUMMARY:

 ====    definitely lost:  bytes in  blocks

 ====    indirectly lost:  bytes in  blocks

 ====      possibly lost:  bytes in  blocks

 ====    still reachable: , bytes in  blocks

 ====         suppressed:  bytes in  blocks

 ==== Reachable blocks (those to which a pointer was found) are not shown.

 ==== To see them, rerun with: --leak-check=full --show-leak-kinds=all

 ====

 ==== For counts of detected and suppressed errors, rerun with: -v

 ==== ERROR SUMMARY:  errors from  contexts (suppressed:  from )

 nol@nol-VirtualBox:~/desktop$