1: // Computing the sum of the consecutive integers from 1 to n: 2: long n = 10000; // ten thousand 3: 4: // Algorithm A 5: long sum = 0; 6: for (long i = 1; i <= n; i++) 7: sum = sum + i; 8: System.out.println(sum); 9: 10: // Algorithm B 11: sum = 0; 12: for (long i = 1; i <= n; i++) 13: { 14: for (long j = 1; j <= i; j++) 15: sum = sum + 1; 16: } // end for 17: System.out.println(sum); 18: 19: // Algorithm C 20: sum = n * (n + 1) / 2; 21: System.out.println(sum);