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assn3_soln - MIT OpenCourseWare http/ocw.mit.edu 6.096...

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MIT OpenCourseWare http://ocw.mit.edu 6.096 Introduction to C++ January (IAP) 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
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Massachusetts Institute of Technology 6.096 Lab 3 Solutions Part 1: 1. (4 x 2 points) a. A function prototype for square should be added before main (or the whole function should be moved earlier). b. Either number should be added as a parameter to square, or number should be made a global variable and removed from the function call to square. The former method is preferable, since the latter entails creating global variables unnecessarily. c. Change the square prototype and definition to take an int&. d. sumOfPositives should return sum. Also, the call to it has too many arguments, which can be corrected either by adding an argument to the prototype and definition or by deleting one of the arguments. 2. (3 x 2 points) a. It prints "This is not the hello message!" . b. It prints the numbers from 0 to 9 (the print statements that actually print these numbers alternate between main and the function). c. It prints the numbers from 0 to 10, repeating each of the numbers in between twice. There are two print statements: the one in mystery gets executed for a given number, and then, since the parameter was passed by reference, the original counter is not updated by mystery, but only by the for loop, so the same number is printed again by the cout statement in main. Part 2: 1. (15 points) double calculatePi( int numDarts ) { int dartsInCircle; for( int i = 0; i < numDarts; i++ ) { double xVal = rand() / static_cast<double>(RAND_MAX), yVal = rand() / static_cast<double>(RAND_MAX); if( sqrt(xVal * xVal + yVal * yVal) <= 1 ) dartsInCircle++; } // pi = circle area / r^2, but r == 1 return static_cast<double>(dartsInCircle) / numDarts; }
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2. (6+8 points)
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