Variables must be declared before use from "summary" of C Programming Language by Brian W. Kernighan,Dennis Ritchie
In C, variables must be declared before they are used. This means that you must specify the type of the variable and give it a name before you can use it in your program. For example, if you want to use a variable called "count" in your program, you must first declare it like this: ```c int count; ``` This tells the compiler that "count" is an integer variable. Once you have declared the variable, you can then use it in your program to store and manipulate data. If you try to use a variable that has not been declared, the compiler will generate an error. This is because the compiler needs to know the type of the variable in order to allocate the correct amount of memory for it. Declaring variables before they are used is a fundamental rule in C programming. It helps to ensure that your program is well-structured and easy to understand. By declaring variables at the beginning of your program, you make it clear to both yourself and others what types of data the program is working with. In addition, declaring variables before use can help to catch errors early in the development process. If you forget to declare a variable, the compiler will let you know right away, rather than allowing the error to cause problems later on.
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