How do I raise g to the a power modulo n in c?

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run the loop till g and multiply n every time with another integer which already define like p=1, and another way by using pow(n,g) but u must use header file math.h.
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Self created coding can also work for this or the pow() function in the library of math. h . So by using pow() function we write as per ur question : pow(a, g) %n. If u want to write own function then reply back.
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