[C/C++标准库]_[初级]_[字符串string转换大小写]

transform

toupper

tolower

场景:

1. 转换字符串大小写，只有C的toupper怎么办？？？

代码:

#include <stdlib.h>
#include <string.h>
#include <string>
#include <iostream>
#include <sstream>
#include <algorithm>
using namespace std;


int main(int argc, char const *argv[])
{
	string str("abcdefghijklnmopqrstuvwxyz123");
	std::transform(str.begin(),str.end(),str.begin(),::toupper);
	cout << str << endl;

	char str2[] = "abcdefghijklnmopqrstuvwxyz1234";
	std::transform(str2,str2+26,str2,::toupper);
	cout << str2 << endl;
	return 0;
}

输出:

ABCDEFGHIJKLNMOPQRSTUVWXYZ123
ABCDEFGHIJKLNMOPQRSTUVWXYZ1234