2. Write a function void decrement (int* a) to decrease the value of the argument in the main function by 1. You should use pointer as parameter to the function decrement. Similarly, write a function swap to exchange the values of two variables outside the function. "C:\Users\Chunhua\Desktop\B#Fall201. = 5 before decreament. = 4 after decreament. a %3D la %3D Press any key to continue,

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