#include<iostream> #include<cstring> using namespace std; int main(){ //strcpy( , ) 将字符数组~复值给~ //strcat( , ) 字符数组拼接 //strcmp(a,b) a>b cout<<"1" a==b cout<<"0" a<b cout<<"-1"; long long n; cin>>n; int max=0; if(n<0){ n= -1*n; } while(n>0){ if(max<n%10){ max=n%10; } n=n/10; } cout<<max; return 0; }