S
AMPLE
F
INAL
ECS 30-A — S
PRING
2002
Version of June 3, 2002 8:19 am Page 1 of 2
Sample Final
1. Here is a macro for computing the maximum of two munbers:
#define max(x, y) ((x) > (y) ? (x) : (y))
and here is a function:
int max(int a, int b)
{
return(a > b ? a : b);
}
In the following code fragment, give the values of a, b, c, d, and e at the end if max is the above macro, and then
if max is a function call:
a = -1;
b = 0;
c = 1;
d = max(++a, b);
e = max(c++, b);
2. Here is a very simple program which is designed to sum its arguments:
#include <stdio.h>
int main(int argc, char *argv[])
{
int sum = 0;
int i;
for(i = 1; i < argc; i++)
sum += argv[i];
printf(“%d\n”, sum);
return(0);
}
a. Suppose this program is invoked as
sum 1 2 3
What are the values of argc and the elements of argv? Draw a picture if that would help you indicate what
the values are. Please note I want the value of argc, argv, and each element of argv, and so forth, either as a
number or character, or as arrows in a picture (for addresses).
b. When I ran this programs, I got 2147431340. Why does the program print the incorrect value, and how
would you fix it? (If you cannot write the code, for partial credit simply say what you would do.)
3.
variable value if max is macro value if max is function
a
b
c
d
e
