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Asked: 2026-06-05T21:04:01+00:00

In my project i need to take an expression input from user as string

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In my project i need to take an expression input from user as string and then show the result of the expression. I am taking the input as follows

char address[100] = {NULL};
fgets(address, 100, stdin); //take the expression as input here

say user wrote the expression as 

address = " 1+5+9" .

What i need to do is to show the result of the expression. I can do this by separating each number and then doing the calculation. But i just wanted to know is there any better way to do this?

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1 Answer

  1. Editorial Team

    It’s sounds like you’re looking for a C++ equivalent to something like eval in JavaScript. Unfortunately, C++ doesn’t have one. Parsing the expression by hand is the best you can do.

    If you have access to The C++ Programming Language book, chapter 6 covers how one would write a simple calculator program, solving the same problem you have.

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