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Can anyone help me make a SMART C program calculator..? - write a c program for calculator

Ok, I recently had a computer program he wrote, so help me someone, please change it in two sections, but could see no objection to the code, lol. So I'll just ask if you time PPL, ie, that no ideas how to write a calculator in C. I wanted to wait before the primary user, then a separate function for the calculations. Who ...?