I had study it for a long time .but I didn't solve it .Ihad read <<Debuging with GDB>> But I didn't get something useful. include<iostream> #include<cstdlib> using std::isdigit; int main() { int i=4; try { while(1) { std::cin>>i; if(!isdigit(i)) { std::cout<<"not digit ,once more"<<std::endl; std::cout<<"i="<<i<<std::endl; } if(i==2) { std::cout<<"good boy"<<std::endl; } else { std::cout<<"bad boy"<<std::endl; }
} } catch(...) { std::cout<<"execption had happened"<<std::endl; } } //end of the codes //from here: std::cin>>i; (gdb) s //here ,no chance to input anything. (gdb) s (gdb) s not digit ,once more (gdb) s i=4 (gdb) s (gdb) s bad boy (gdb) s //no chance to input anything,there is no prompt for input. (gdb) s (gdb) s not digit ,once more (gdb) s i=4 (gdb) But I can input something when I am no in the main function. anyhelp? thanks very much. _______________________________________________ Help-gnu-emacs mailing list Help-gnu-emacs@gnu.org http://lists.gnu.org/mailman/listinfo/help-gnu-emacs