COP 3223 Section 3 Exam #2
Form A
Fall 2007
10/23/07
Lecturer: Arup Guha
Directions: Answer all multiple choice questions on the
scantron. Each question has a single correct answer. In case
of ambiguities, choose the most accurate answer. Each of
these questions is worth 3 points for a correct answer,
except for question 17, which is worth 2 points. Incorrect
answers and questions left blank are worth 0 points. Hand
in ONLY the scantron, keep the test questions, and take the
free response section.
Please reference the following program to answer questions #1 and 2.
#include <stdio.h>
void f(int a, int b);
int main() {
int a=3, b=5;
f(b+a,b-a);
printf("a=%d, b=%d\n",a,b);
return 0;
}
void f(int a, int b) {
int tmp = a+b;
a = 2*tmp;
b = a - b;
printf("a=%d, b=%d\n",a,b);
}
1) What is the first line of output produced by the program above?
A)a=3, b=5
B)a=8, b=2
C)a=18, b=20 D)a=20, b=18 E)None of the Above
2) What is the second line of output produced by the program above?
A)a=3, b=5
B)a=5, b=3
C)a=8, b=2
D)a=2, b=8
E)None of the Above
3) How many times does the loop below execute?
int i;
for (i=3; i<=93; i=i+6)
printf("one more time\n");
A)3
B)15
C)16
D)90
E)None of the Above
4) How many times does the word KNIGHTS get printed out in the code
segment below?
int i;
for (i=0; i<40; i++) {
printf("KNIGHTS\n");
if ((i+1)%12 == 0)
break;
}
A)11
B) 12
C) 13
D) 39
E)None of the Above
5) Which of the following functions reads in a single character from
the keyboard?
A)getchar
B)putchar
C)printf
D)scanf
E)None of the Above
Please reference the following program to answer questions #6, 7 and 8.
#include <stdio.h>
void g(int *a, int b);
int main() {
int a=3, b=5;
g(&b,a);
printf("a=%d\n",a);
printf("b=%d\n",b);
return 0;
}
void g(int *a, int b) {
(*a) = (*a) + 2*b;
b = (*a) - b;
printf("a=%d, b=%d\n",*a,b);
}
6) What is the first line of output produced by the program above?
A)a=5, b=3
B)a=3, b=5
C)a=8, b=11 D)a=11, b=8 E)None of the Above
7) What is the second line of output produced by the program above?
A)a=3
B)a=5
C)a=8
D)a=11
E)None of the Above
8) What is the third line of output produced by the program above?
A)b=3
B)b=5
C)b=8
D)b=11
E)None of the Above
9)How many times does the code segment below print out the letter X?
int i,j;
for (i=0; i<10; i++)
for (j=1; j<=12; j+=2)
printf("X");
A)10
B)12
C)22
D)120
E)None of the Above
10) How many times does the code segment below print out the word
KNIGHTS?
int i;
for (i=0; i<40; i++) {
if ((i+1)%12 == 0)
continue;
printf("KNIGHTS\n");
}
A)36
B)37
C)39
D)40
E)None of the Above
Please reference the following program to answer questions #11 and 12.
#include <stdio.h>
int h(int a, int b);
int main() {
int a=3, b=5;
b = h(b,a);
printf("a=%d, b=%d\n",a,b);
return 0;
}
int h(int a, int b) {
a = a*b%8;
b = b + a;
printf("a=%d, b=%d\n",a,b);
return 2*a - b;
}
11) What is the first line of output produced by the program above?
A)a=7, b=5
B)a=5, b=7
C)a=7, b=10 D)a=10, b=7 E)None of the Above
12) What is the second line of output produced by the program above?
A)a=3, b=4
B)a=3, b=5
C)a=4, b=3
D)a=5, b=3
E)None of the Above
13) If the ascii value of 'A' is 65, what is the integer value of the
expression 'C' + 'F' – 'D'?
A)65
B)67
C)69
D)71
E)None of the Above
14) Which of the following declares a file pointer and opens an input
file called "data.txt" from which to read?
A)FILE
B)FILE
C)FILE
D)FILE
E)None
*ifp =
*ifp =
*ofp =
*ifp =
of the
fopen(data.txt,r);
fopen(data.txt,"r");
fopen("data.txt", "r");
fopen("data.txt", "w");
Above
15) Which of the following writes the word HELLO to the output file
pointed to by the file pointer ofp?
A)printf("HELLO");
B)fprintf("HELLO");
D)fprintf(ofp,"HELLO"); E)None of the Above
C)fprintf("HELLO","w");
16) What is the return value of the expression isupper('C')?
A)0
B)1
C)2
D)3
E)None of the Above
17) In which city do the American League Champion Boston Red Sox play
their home games?
A)Boston
B)Plymouth
C)Redding
D)New York
E)None of the Above
Fall 2007 COP 3223 Section 3
Exam 2 Free Response Answer Sheet
Last Name: ____________ , First Name: _____________
1) (5 pts) Convert the following segment of code that uses a while loop into an equivalent
segment of code that uses a for loop. (Note: Assume that all variables used in the segment
of code have been previously declared and initialized.)
cnt =
while
sum
cnt
}
0;
(cnt < n) {
= sum + cnt;
= cnt+1;
2 xy
.
x y
Write a function that takes in two parameters x and y, and returns their harmonic mean. If
either of x and y is 0 or negative, return 0, otherwise return the value described above.
2) (15 pts) The harmonic mean of two positive real numbers x and y is equal to
double HarmonicMean(double x, double y) {
}
3) (10 pts) Complete the function below which "matures" your account by one year. In
particular, the function will take in two pointers: a pointer to a integer which stores your
age, and a pointer to a double, which stores the amount of money in your bank account.
The task of the function is to update your age (by adding one to it), and update the
amount in your bank account by adding 5% of its value to it.
void matureOneYear(int *pAge, double *pMoney) {
}
4) (20 pts) A file named nba.txt stores the scoring averages of all NBA players. The
format of the file is as follows. The first number in the file, n, is a positive integer
representing the number of players in the file. The following n lines contain two numbers
each (separated by spaces). The first number is a unique player identification number,
which is always an integer. The second number is that player's scoring average, which is
a real number. Complete the program below so that it reads in the information from the
file and prints out both the player identification number and scoring average of the player
with the highest scoring average. (Note: you are guaranteed that only one player will
have the highest scoring average.)
#include <stdio.h>
int main() {
FILE *ifp;
ifp = fopen("nba.txt", "r");
fclose(ifp);
return 0;
}