4. Write a function to perform a dot product. (the function is product = x, y, for all i, where the vectors x and y are n elements each. The function must work correctly for any n up to 100.): (20) the function prototype is: short mydot(short x[ ], short y[ ), short n); 5. For the dot product function above, write a C code fragment that calls the function and puts the result into the global long variable dotProduct. The vectors to be multiplied are a and b defined in earlier statements as follows: (10) short a[4]-{1,2,3,4}; short b[4]={5,6,7,8}; 6. Write a single C statement that sets bits 4 and 5 of Port B to be inputs but leaves the other 61 bits of data direction unchanged. (4)