When we mention the prototype of a function?

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Computer & Maths Professor

The prototype of a function is mandatory when we define the function after main function otherwise it is optional in the case when we define the function before main function.
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Thanks for the question Shagufta, We can mention the prototype of a function in both declaration or definition. Thanks, Team DishaaPro www.dishaapro.com
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C Language Trainer

We mention prototype of a function at the beginning of the program soon after the inclusion of header files. First comes header files and next to them we write prototype of a function
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