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Whats the difference between Integer, Real and String variables?

An integer is like a whole number, with negatives. So it can be ...-2, -1, 0, 1, 2... and so on.
A real number contains decimals, so it can have fractions: 0.031, 192.6, 10.5 etc.
A string is a list of text or some such. So it can be "Hello!", "Bob" or something like that.

Thanks

a string is really a array of type char, which is an 8 bit number from -128 to 127. It is often used to represent characters, which is where "char" comes from.

So in ge you make a string like so

char name[howmany];