#include #include #include int main(int argc, char **argv) { int i, sum_squares = 0, square_sum = 0; double elapsed; struct timespec start, end; clock_gettime(CLOCK_MONOTONIC, &start); for(i = 1; i <= 100; i++) { sum_squares += i*i; square_sum += i; } square_sum *= square_sum; clock_gettime(CLOCK_MONOTONIC, &end); elapsed = (end.tv_sec - start.tv_sec) + (double)(end.tv_nsec - start.tv_nsec) / 1000000000; printf("Project Euler, Problem 6\n"); printf("Answer: %d\n", square_sum-sum_squares); printf("Elapsed time: %.9lf seconds\n", elapsed); return 0; }