Web Reference: Oct 13, 2025 · In C, scanf () is a standard input function used to read formatted data from the standard input stream (stdin), which is usually the keyboard. It scans the input according to the specified format specifiers (like %d, %f, %s, etc.) and stores the values into the provided variable addresses. Mar 6, 2023 · But it's important to use scanf() carefully and to always validate user input to prevent security vulnerabilities and unexpected program behavior. In this article, we'll take a closer look at the scanf() function and how to use it effectively in C programming. The scanf() function reads user input and writes it into memory locations specified by the arguments. The scanf() function is defined in the header file.
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