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I'm trying to compile and run a simple c++ program in the command line.
But after the compilation, bash replies "command not found" when I try to run the program.
g++ -o sim_pro sim_pro.cpp
sim_pro
bash: sim_pro: command not found
You need to run the executable as "./sim_pro". This tells the shell to run the executable in the current directory (which is what . is shorthand for). When you specify an executable, the shell looks in the directories listed in $PATH for it, so that's why you get "command not found" (because it isn't in one of those directories).
Unless sim_pro is in a directory that is in your $PATH, you need to provide either the absolute or relative path to the executable. Try executing sim_pro like
Do you have g++ aliased (Wondering if there's an odd character in there)
Also, have you tried changing your shell and running this. If ksh gives you the same error, try using -Wall in your compile options so that, if it's really g++ complaining, it'll let you know.
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