Write a program in C Write two functions product1()andproduct2( )that can multiply two integers and return the result. Function product1()takes only two parameters (n1)and (n2)which are both input parameters. The second function product2( )takes an output parameter (p)in addition to those two input parameters.Write a program that opens a text file "integers.txt" to read two integers and calls the two functions product1( )and product2( )to test that they are working properly.

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Variables and Constant

Constants and variables are widely used in mathematical equations and expressions. They are also commonly found in the domain of programming, where each language has its own way to differentiate between a constant and a variable. Since they have all sorts of applications, knowing their differences is a good place to start.