#include <iostream>
using namespace std;
int main(){
    int sum=0;
    string s;
    cin>>s;
    for(int i=0;i<s.length();i++)if(!((s[i]-'0')%2))sum+=s[i]-'0';
    cout<<s.length()<<' '<<sum<<endl;
    return 0;
}

字符串

#include<bits/stdc++.h>
using namespace std;
int main()
{
    string s;
    int ans=0;
    cin>>s;
    cout<<s.length()<<" ";
    for (int i=0;i<s.length();i++)
        if ((s[i]-'0')%2==0)
            ans+=(s[i]-'0');
    cout<<ans;
    return 0;
}

直接输出样例（）

#include<bits/stdc++.h>
using namespace std;
int main()
{
    cout<<8<<" "<<18;
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int x, n, i = 0, sum = 0;
	cin >> n;
	while(n > 0){
		i++;//计数一共有几位数
		x = n % 10;
		//判断每位数是否有偶数，是就加入到总和
		if(x % 2 == 0){
			sum += x;
		} 
		n = n/10;
	}
	cout << i << " " << sum << endl;
	return 0;
}

#include <bits/stdc++.h>
using namespace std;
int num(int n){
    int num = 0;
    while (n > 0){
        num++;
        n /= 10;
    }
    return num;
}
int sum(int n){
    int sum = 0;
    int m;
    while (n > 0){
        m = n % 10;
        if (m % 2 == 0) sum += m;
        n /= 10;
    }
    return sum;
}
int main(){
    int n;
    cin >> n;
    cout << num(n) << " " << sum(n);
}

#include <bits/stdc++.h>
using namespace std;
int main(){
    cout << 8 << " " << 18;
}