cstring_iter.cpp

来自「斯坦福Energy211/CME211课《c++编程——地球科学科学家和工程师》」· C++ 代码 · 共 33 行

#include <iostream>
#include <cstring>
#include <cctype>

using namespace std;

int main()
{
	char word[] = "hello";
	
	// Random-access iteration
	for ( unsigned int i = 0; i < strlen(word); i++ )
		word[i] = toupper( word[i] );
	
	cout << word << endl;
	
	// The same iteration, using a pointer,
	// is actually more efficient, because 
	// incrementing is a cheaper operation
	// than the regular addition carried out
	// by the compiler to compute the address
	// of word[i]
	char *cp = word;
	while ( *cp != '\0' )
		*cp++ = tolower( *cp );

	for ( char *cp = word; *cp != '\0'; cp++ )
		*cp = tolower( *cp );
	
	cout << word << endl;
}