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Chapter 23 Answers to Selected Exercises 1. [was #2; modified] double round_nearest(double x, int n) { double power = pow(10.0, n); if (x < 0.0) return ceil(x * power - 0.5) / power; else return floor(x * power + 0.5) / power; } 6. [was #6] (a) memmove (b) memmove (we can't use strcpy because its behavior is undefined when the source of the copy overlaps with the destination) (c) strncpy (d) memcpy 8. [was #8] int numchar(const char *s, char ch) { int count = 0; s = strchr(s, ch); while (s != NULL) { count++; s = strchr(s + 1, ch); } return count; } 10. [was #10] if (strstr("foo#bar#baz", str) != NULL) … The assumptions are that str is at least three characters long and doesn't contain the # character. 11. [was #12] memset(&s[strlen(s)-n], '!', n); Answers to Selected Programming Projects 2. [was #4; modified] #include <ctype.h> #include <stdbool.h> /* C99 only */ #include <stdio.h> int main(void) { bool nonblank_seen = false; int ch; while ((ch = getchar()) != EOF) { if (nonblank_seen) putchar(ch); else if (!isspace(ch)) { nonblank_seen = true; putchar(ch); } if (ch == '\n') nonblank_seen = false; } return 0; } Copyright © 2008, 1996 W. W. Norton & Company, Inc. All rights reserved.

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