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error in terminal while running C++ program in eclipse

sd flag

I am trying to run simple "hello world" program in eclipse in ubuntu 20.04 but i am getting error. Before my eclipse was running fine and i was able to run successfully all programs but i don't know what happened suddenly it started showing error in every code and even in simple code of "hello world".plz help me

Thanks in advanceenter image description here

waltinator avatar
it flag
By posting a picture of text, you make it impossible for potential helpers on phones, or text terminals. to see your text. You make it impossible for any of us to make a local copy for investigation. Rather, [Edit] your Question, copy and paste the text into your Question, select it and use the `{}` formatting tool.
N0rbert avatar
zw flag
Both [ns2](https://www.isi.edu/nsnam/ns/) and [ns3](https://www.nsnam.org/releases/ns-3-35/) are not simple "hello world" programs, they are network simulators. Please edit your question - add details, steps to reproduce and your final idea. Also consult with https://www.nsnam.org/releases/ns-3-35/documentation/ .
Knud Larsen avatar
by flag
Avoid images of text https://unix.meta.stackexchange.com/questions/4086/psa-please-dont-post-images-of-text ..... also at https://groups.google.com/g/ns-3-users
mangohost

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Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.