C - Variables - Tutorialspoint
https://www.tutorialspoint.com/cprogramming/c_variables.htm
The line int i, j, k; declares and defines the variables i, j, and k; which instruct the compiler to create variables named i, j and k of type int. Variables can be initialized (assigned an initial value) in their declaration. The initializer consists of an equal sign followed by a constant expression as follows − type variable_name = value;
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