Example 1 and 2 of variadic templates

void printX() {}
template<T, typename... types>
void printX(const T& firstArg, const types&... args) {
	std::cout << firstArg;
	printX(args...);
}
另外上面的printX可以写成下面的格式,下面这种格式为泛化格式版本
template<typename... types>
void printX(const types&... args) {
	//statement
}

printf("%s, %d, %c\n", "haiyang", 15, 'c');
void printf(const char *s) {
	whild(*s) {
		if ((*s == "%") && (*(++s) != "%")) { 
			printf("invalid format stting:missing arguments");
		}
		std::cout << *s++;
	}
	return;
}

template<T, typename... types>
void printf(const char* s, T value, const types&... args) {
	while(*s) {
		if ((*s == "%") && (*(++s) != "%")) {
			std::cout << value;
			printf(s, args...);
			return;
		} 
		std::cout << *s++;
	}
	return;
}