Member Avatar for ChrisXxX

How do u scan a floating number from a file?

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  • Latest Post Latest Post by Ancient Dragon
Member Avatar for Adak 
fscanf(FilePointer, "%f", &variableName);

All the scanf() family of functions are subject to quitting the first time they receive data that they aren't set up to handle. It's important to check their return value to see if it actually worked or not, (it returns the number of items it has successfully handled), and it should only be used on data that is FORMATTED properly. Data that variies from one week to the next, is not a good candidate for fscanf().

commented: well said +6
Member Avatar for Ancient Dragon

Depends on whether its of type float or double. Floats are "%f" but doubles are "%lf". I think long doubles would be "llf", which is a little like long long int (64-bit integers).

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