C++ basics - Reverse

4

Reverse

#include <string.h>
char *reverse( char *s )
{
char *p, *q;
for ( p = s, q = s+strlen(s)-1; q > p; p++, q-- ) {
char c = *p;
*p = *q;
*q = c;
}
return s;
}
#if defined( STANDALONE )
#include <iostream>
void test( char *s )
{
// printing s and reverse( s ) in one statement calls reverse first!
std::cout << "[" << s << "]<->[";
std::cout << reverse( s ) << "]\n";
}
int main() {
// don't use char* (read-only)
char s1[] = "123";
char s2[] = "12";
char s3[] = "";
test( s1 );
test( s2 );
test( s3 );
}
#endif

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