Hi, I wrote a c program, complied and ran with linux g++. It is no problem with first 26 runs, I mean, I got the output which I want exactly. However, an error message is got in the 27th run, that is: terminate called after throwing an instance of 'std::bad_alloc' what(): St9bad_alloc Aborted Anyone has an idea about how to solve this problem? Thanks a lot.