your_prompt> gcc usp-982-ex1.c your_prompt> ./a.out sum is 0 your_prompt> ./a.out 1 2 3 sum is 6 your_prompt> ./a.out 1 2 3 "1 2 3" sum is 12 your_prompt> ./a.out 1 2 3 "1 2 3" 4 5 666 sum is 687 your_prompt>