简单练手编译编程蟹蟹啦

//*******3*****//
#include<bits/stdc++.h>
using namespace std;
int a(int b,int c,int d)
{
    if(b<c and b<d) return b;
    if(c<d and c<d) return c;
    else return d;
}
int main()
{
    int d,b,c;
    cin>>d>>b>>c;
    cout<<a(d,b,c);
}

//*********4********//
#include<bits/stdc++.h> 
using namespace std;
int main()
{
long int x;
int g,s,b,q,w;
int n;
scanf("%ld",&x);
if(x>9999)
n=5;
else if(x>999)
n=4;
else if(x>99)
n=3;
else if(x>9)
n=2;
else
n=1;
printf("%d\n",n);
w=x/10000;
q=x%10000/1000;
b=x%10000%1000/100;
s=x%10000%1000%100/10;
g=x%10000%1000%100%10;

if(w!=0)
{ printf("%d %d %d %d %d",g,s,b,q,w);}
else if(q!=0)
{printf("%d %d %d %d",g,s,b,q);}




else if(b!=0)
{printf("%d %d %d",g,s,b);}

else if(s!=0)
{ printf("%d %d",g,s);}

else
{ printf("%d\n",g);printf("%d",g);}

}

//****************1*********//
#include<bits/stdc++.h>
using namespace std;
int main()
{
    char a;
    cin>>a;
    if(islower(a))
    {
        a=toupper(a);
        cout<<a;
    }
    else if(isupper(a))
    {
        a=tolower(a);
        cout<<a;
    }
    else{cout<<"输入错误"; 
        
    }
}

//********2********//
#include<bits/stdc++.h>
using namespace std;
int main()
{
    double a;
    cin>>a;
    if(a<=100 and a>=90)
    {
        cout<<"5";
    }
    else if(a<90 and a>=75)
    {
        cout<<"4";
    }
    else if(a<75 and a>=60)
    {
        cout<<"3";
    }
    else 
    {
        cout<<"2";
    }
}