Advances in Computers, Vol. 17 by Marshall C. Yovits

By Marshall C. Yovits

For the reason that its first quantity in 1960, Advances in pcs has provided precise assurance of concepts in and software program and in machine conception, layout, and purposes. It has additionally supplied individuals with a medium during which they could research their topics in larger intensity and breadth than that allowed by means of normal magazine articles. for this reason, many articles became ordinary references that stay of important, lasting worth regardless of the swift development occurring within the box.

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The calculation of blocks_needed on lines 8 9 and the return statement on line 53 are both complicated. Verify that they are correct. 3. What is the loop counter for the while loop on lines 19 35? Is it properly incremented? Are the initialization and termination clauses correct? 4. For the five local variables, note any sections of the code in which they stay invariant. Hints Walk through the code with the following parameters to the function: 1. The initial case: Nothing has been allocated, so the array_in_use[] array is still set up the way it was by the memory_init() function: array_in_use[0] == BLOCK_COUNT array_in_use[1] == BLOCK_COUNT array_in_use[2] == BLOCK_COUNT ...

Source_ptr = source; 29. source_end = source + (length-1); 30. target_ptr = target; 31. step = 1; 32. } 33. 34. // 35. // Now do the copy. 36. // 37. while (1) { 38. 39. 54 if (source_ptr == source_end) done = 1; 55 40. *target_ptr = *source_ptr; 41. if (done) 42. break; 43. source_ptr += step; 44. target_ptr += step; 45. } 46. } Suggestions 1. Consider the local variable done. Where is it used? Is it used correctly? 2. The if on lines 21 and 22 is the heart of the algorithm. Is it correctly calculating whether the buffers overlap?

Of course, some functions do not have any input that could be considered a real error. But in most cases, it should be possible to come up with an error input and walk through it. Loops Just as you can't walk through your code with all possible inputs, you usually can't walk through every iteration of a loop. In some cases, you can control the number of iterations of the loop by limiting the input size. With code such as the following int sum_array(int arr[], int count) { int j; for (j = 0; j < count; j++) { // code to sum the array } // return the sum } the input to the function directly controls how many times the loop iterates.

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