In C, there are many predefined library functions are available for input and output operations. These functions are collectively called standard input-output library functions, and all these functions are available in stdio. The printf function in the C programming language is used for output formatting. It is used to display information required by the user and also prints the value of the variables. It formats the output, like the width of the output, the sign of the output e. Hi Hello
Input and Output Functions in C
Output Formatting Using Printf Function in C
Up to this point, we have seen how to read and write characters and string to and from the file. In the real world, the data consists of many different types. In this chapter, we will learn how we can input and output data of different types in a formatted way. We use formatted input and output when we want to read or write data in a particular format.
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C printf and scanf
The printf function writes the string pointed to by format to stdout. The format specifiers are replaced by the values of respective variables that follows the format string. If successful, the printf function returns number of characters written.
One common use of variable-length argument lists is to implement functions that are a thin wrapper around the printf family of functions. One such example is a set of error reporting functions. This is a bare-bones example; such packages can be much elaborate.