Today is the fifth day to learn cs50 week1 short videos.But cs50 has the newer videos. Remmber the values on the both sides of the equal symbol , Assignment from left to right,unsigned int can increase the positive integer of 2 billion to a positive integer of 4 billion .void type returns nothing, for example, printf and main function.Float type can be double,so pi takes on places, from 7 to 30, from 32bits to 64bits.okay.
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