Input and Output Functions
1. Formated I/O Functions
These functions allow us to supply the input in a fixed format and let us obtain the output in the specified form. There are several format specifiers and escape sequences available to format input and output. The functions printf(), and scanf() fall under this category.
2. Unformatted I/O Functions
These functions work faster since they do not have the overheads of formatting the input or output.