哪里可以找到NS2库的cpp文件中生成的打印信息，我在其中添加了一些cout（）函数来打印一些信息？

I'm using ns2 in linux to do some network experiments. I added some print lines in some of the cpp files of the ns library(through the function cout()). But when I execute the TCL scripts, I can't see the printed information on the screen. So where can i find the printed information generated in the cpp files? I'm using ns2 in linux to do some network exper