C语言解答

#include<stdio.h>
#include<string.h>
int main()
{
	char str[80];
	int len,i,a=0,b=0;
	gets(str);
	len=strlen(str);
	for(i=0;i<len;i++)
	{
		if (('A'<=str[i])&&(str[i]<='Z'))
		{
			str[i]=str[i]+32,a++;
		}
		else if (('a'<=str[i])&(str[i]<='z'))
		{
			str[i]=str[i]-32,b++;
		}
	}
	puts(str);
	printf("%d %d",b,a);
	return 0;
}

C++解答

#include <iostream>
#include <string>
using namespace std;
int main()
{
	int big = 0, small = 0;
	string s;
	cin >> s;
	for (int i = 0; i < s.size(); i++)
	{
		if (s[i] >= 'A' && s[i] <= 'Z')
		{
			small++;
			s[i] += 32;
		}
		else
		{
			big++;
			s[i] -= 32;
		}
	}
	cout << s << endl;
	cout << big << ' ' << small << endl;
	return 0;
}