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 ...
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