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In C, how do I use scanf to read an equation in the format Ax+By=C?

• I want the program to extract A, B and C from the equation ONLY if the input is in this format. Also, spaces are allowed but not between the variables to the coefficients: 5x + 5y= 3 is fine 5 x + 5 y = 3 should return an error. I tried scanf("%dx+%dy=%d",&A,&B,&C) where A, B, C are predefined integers. It did some of the input checking but not all of it: for instance, it accepts the first digit whether it's followed by an "x" or not. Also the spaces are not handled properly. Thanks for your answers

• Answer:

  You cannot do that with scanf! It's much easier to do it with regular expressions. If you don't know whats a regular expression look here http://en.wikipedia.org/wiki/Regular_expression After learning that now you can use sscanf function (yes with double s) Example: int returned; returned = sscanf(string, "your reg ex", A, B, C); if you didn't understand it try searching for sscanf.