Computer System 2

// CS201 Assignment 5: Optimization of a loop. // // This is your starting code. #include <stdio.h> #include <stdlib.h> #include <time.h> // Submitted code must have the correct values for these two constants: // N_TIMES: 200000 // ARRAY_SIZE: 9973 // Feel free to play with these numbers below during test, // but ensure you submit with the correct numbers. // #define N_TIMES 200000 #define ARRAY_SIZE 9973 int main (void) { int *array = calloc(ARRAY_SIZE, sizeof(int)); int sum = 0; int checksum = 0; int i; int j; int x; // Make sure you change this so you get credit. // printf("CS201 - A05\n"); // Initialize the array with random values 0 to 13. // srand(time(NULL)); for (j=0; j < ARRAY_SIZE; j++) { x = rand() / (int)(((unsigned)RAND_MAX + 1) / 14); array[j] = x; checksum += x; } //printf("Checksum is %d.\n",checksum); for (i = 0; i < N_TIMES; i++) { // --------------------------------------------------------------- // Do not alter anything above this line, except for the print // statement with your name, and any variables that need to be declared // outside of the i loop. Here is where you make your changes to // optimize performance. for (j=0; j < ARRAY_SIZE; j++) { sum += array[j]; // printf("Sum is now: %d\n",sum); } // Do not alter anything below this line. // --------------------------------------------------------------- // Check each iteration. // if (sum != checksum) { printf("Checksum error!\n"); } sum = 0; } return 0; }