Reading Before A Point

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hey guys,

i am running a 'how to make a programming language' class at school and a friend asked me this one question. lets say in my programming language, to define a variable, you just put in 'string var = "Hello World"'. I am able to do that, but if i were to put in the code 'var = "Something else"', how am i able to do this. one of the ways that i thought of doing it is

if (a.Contains("="))
{

}

but the thing is, i don't know how to make it so that it can read before that equals sign. can you please help me? Thanks.

Posted 11-Dec-12 20:50pm

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OriginalGriff · Answer 1 · 2012-12-11T21:10:00

Seriously? You have much, much bigger problems coming up that "read before the equals sign", and a specific solution to this one problem would not be a good investment of your time.

Look at the way other compilers, interpreters and so forth are written: most of them use a process called tokenisation[^] to identify the various parts of the input, and then parse the tokens for syntactical analysis.
I think it would probably be a good idea if you spent some time reading, before launching into code. This is a good start: Google: Writing a compiler[^]