Web Reference: Sep 19, 2012 · Can someone explain what the code does, especially the subtraction with 48 part? The code basically sums the digits of a number represented as a string. It makes two important assumptions to work properly: In ASCII, '0' == 48, '1' == 49, and so on. Thus, '0' - 48 == 0, '1' - 48 == 1, and so on. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. C is a general-purpose programming language that has been widely used for over 50 years. C is very powerful; it has been used to develop operating systems, databases, applications, etc.
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