Loop Example: 3n

// Yield 3 raised to the nth power.

public static int powerOfThree(int n)

{

int i; // loop counter

int prod = 1; // holds accumulated product

i = 0;

// Invariant: prod holds 3^i.

while (i < n){

prod = 3*prod;

i = i+1;

}

return prod;

}

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