Cracking the Coding Interview, 4 Edition - 150 Programming Interview Questions and Solutions

Solutions to Chapter 1 | Arrays and Strings
1.2 Write code to reverse a C-Style String. (C-String means that “abcd” is represented as
five characters, including the null character.)
SOLUTION
pg 48
This is a classic interview question. The only “gotcha” is to try to do it in place, and to be careful
for the null character.
1 void reverse(char *str) {
2 char * end = str;
3 char tmp;
4 if (str) {
5 while (*end) {
6 ++end;
7 }
8 --end;
9 while (str < end) {
10 tmp = *str;
11 *str++ = *end;
12 *end-- = tmp;
13 }
14 }
15 }
CareerCup.com
9 6