practice exam b

# practice exam b - KEY CPSC 206 507 EXAM B Spring 2006...

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KEY CPSC 206 – 507 EXAM B Spring 2006 SID/SSN: Score Possible Points Part One 30 pts Part Two 40 pts Part Three 20 pts Part Four 20 pts Total 110 pts 1

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PART ONE (30 points) 1. What is the output of the following code? #include <stdio.h> int f(int a) { return (a + a); } int g(int *x) { return (*x + *x++); } int main(void) { int i = 5, j = 6; printf(" f = %d\n", f(i + j)); printf(" g = %d\n", g(&i)); i = i + 2; printf(" g = %d\n", g(&i)); printf(" g = %d\n", g(&j)); printf(" i = %d j = %d\n", i, j); return 0; } Answer: f = 22 ((5+6)+(5+6)) g = 10 ((i)+(i++))=(5+5) g = 14 ((i+2)+(i+2)++)=(7+7) g = 12 ((j)+(j++))=(6+6) i = 7 j = 6 2
2. What is the output of the following code? #include <stdio.h> int go_on (int x) { return (x++ < 5); } int tap(int y) { int i; for ( i = y; i--;) printf ("tap "); printf ("\n"); } int main(void) { int x, i = 0; Note: gnw changed to int x = 2, i = 0; while (go_on(x)) tap (++x); return 0; } Answer: tap tap tap tap tap tap tap tap tap tap tap tap 3

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3. What is the output of the following code? #include <stdio.h> void swap (int *m, int *n) { int temp = *m; *m = *n; *n = temp; } int main (void) { int a[4] = {2,7,4,8}; int i, j; for (i = 3; i > 0; --i) { for (j = 0; j < i; ++j) if (a[j] < a[j+1]) swap (&a[j], &a[j+1]); for (j = 0; j < 4; ++j) printf ("%d ",a[j]); printf ("\n"); } return 0; } Answer: 7 4 8 2 7 8 4 2 8 7 4 2 4
PART TWO (40 points). Each question is worth 5 points. Short Answers.

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## This note was uploaded on 03/19/2012 for the course MATH MATH 304 taught by Professor Young during the Spring '09 term at Texas A&M.

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practice exam b - KEY CPSC 206 507 EXAM B Spring 2006...

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