题解

#include<iostream>
#include<cstring>	
using namespace std;
int main(){
    char a[110];
    fgets(a,110,stdin);
    int n=strlen(a),c=0;
    for(int i=0;i<n;i++){
        if(a[i]=='1'){
            c++;
        }else if(a[i]=='2'){
            c+=2;
        }else if(a[i]=='3'){
            c+=3;
        }else if(a[i]=='4'){
            c+=4;
        }else if(a[i]=='5'){
            c+=5;
        }else if(a[i]=='6'){
            c+=6;
        }else if(a[i]=='7'){
            c+=7;
        }else if(a[i]=='8'){
            c+=8;
        }else if(a[i]=='9'){
            c+=9;
        }
    }
    if(c==0){
        cout<<'0';
    }else{
        cout<<c;
    }
    return 0;
}

#include<iostream>
#include<cstring>
using namespace std;
int main(){
	char c[110];
	fgets(c,110,stdin);
	int sum=0;
	for(int i=0;i<strlen(c);i++){
		if(c[i]>='0'&&c[i]<='9'){
            sum+=c[i]-'0';
		}
	}
	cout<<sum;
	return 0;
}

#include<iostream>
#include<string>
using namespace std;
int main(){
	string c;
	getline(cin,c);
	int sum=0;
	for(int i=0;i<c.size();i++){
		if(c[i]>='0'&&c[i]<='9'){
            sum+=c[i]-'0';
		}
	}
	cout<<sum;
	return 0;
}