(a) Write an int function called power (int n, int r) to calculate n to the power of ri.e. n. For example, if n = 3 and r=4, it should return 3* = 81. (b) Write the main program and by calling the function you wrote in (a) display the first 10 powers of 2 until 4 in different lines, i.e. 48 3 9 27 234 185 616 16 81 16 64 256 32 243 1024 64 729 4096 128 2187 16384 256 512 6561 19683 65536 262144 1024 59049 1048576