小测验-字符串应用

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#include <iostream>
#include <string>
using namespace std;

int main() {
    string s;
    getline(cin,s);
    int c=0;
    for(int i=0;i<s.size();i++){
      if('a'<=s[i]&&s[i]<='z')
          s[i]=s[i]-97+65;
     }
    cout<<s<<endl;
return 0;
}

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#include <iostream>
#include <string>
using namespace std;
int main()
{
	string	st;
	int	i, len;
	getline( cin, st );
	len = st.size();
	for ( i = 0; i < len; i++ )
		if ( st[i] >= 'a' && st[i] <= 'z' )
			st[i] = st[i] - 'a' + 'A';
	cout << st << endl;
	return(0);
}

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#include <iostream>
#include <string>
using namespace std;

int main()
{
    string s;
    char m1, m2;
    int i;
    
    getline(cin, s);
    m1 = ' ';
    m2 = ' ';
    for (i = 0; i < s.length(); i++)
        if (s[i] > m1) {
            m2 = m1;
            m1 = s[i];
        }
        else if (s[i] > m2)
            m2 = s[i];
    cout<<(m1)<<' '<<(m2)<<endl;
    return 0;
} 

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#include <iostream>
using namespace std;
const int SIZE = 100;
int main()
{
	int	p[SIZE];
	int	n, tot, i, cn;
	tot = 0;
	cin >> n;
	for ( i = 1; i <= n; i++ )
		p[i] = 1;
	for ( i = 2; i <= n; i++ )
	{
		if ( p[i] == 1 )
			tot++;
		cn = i * 2;
		while ( cn <= n )
		{
			p[cn] = 0;
			cn += i;
		}
	}
	cout << tot << endl;
	return(0);
}

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#include<iostream>
#include<string>
using namespace std;

int main()
{
    string map= "2223334445556667778889999";
    string tel;
    int i;
    cin>>tel;
    for(i=0;i<tel.length();i++)
       if((tel[i]>='0') && (tel[i]<='9') )
           cout<<tel[i];
       else if( (tel[i]>='A') && (tel[i]<='Z'))
           cout<<map[tel[i]-'A'];
    cout<<endl;
    return 0;
}