Python这一块

sentence=input()
pro_sentence = sentence[ : :-1]
length1=len(pro_sentence)
if "%" in sentence:
    storage2=length1-1
    for x in range(1,length1):
        if pro_sentence[x]!='0':
            storage2=x
            break
    final_sentence=pro_sentence[storage2:length1]+"%"
elif "/" in sentence or "." in sentence:
    for y in range(length1):
        if pro_sentence[y]=="/" or pro_sentence[y]==".":
            storage3=y
            break
    left=pro_sentence[storage3+1:length1]
    right=pro_sentence[:storage3]
    if pro_sentence[storage3]=="/":
        try:
            for c in range(0,storage3):
                if right[c]!='0':
                    key2=c
                    break
            for b in range(0, length1 - storage3):
                if left[b] != '0':
                    key1 = b
                    break
            final_sentence=left[key1:length1-storage3-1]+"/"+right[key2:storage3]
        except IndexError:
            final_sentence="0/"+right[key2:storage3]
    elif pro_sentence[storage3]==".":
        key3=length1-storage3-2
        for f in range(0,length1-storage3-1):
            if left[f] !='0':
                key3=f
                break
        key4=0
        for g in range(storage3-1,-1,-1):
            if right[g]!='0':
                key4=g
                break
        final_sentence=left[key3:length1-storage3-1]+"."+right[0:key4+1]
else:
    storage1=length1-1
    for a in range(length1):
        if pro_sentence[a] != '0':
            storage1 = a
            break
    final_sentence=pro_sentence[storage1:length1]

print(final_sentence)

#include<bits/stdc++.h>
using namespace std;
int kind=1;
bool flag;
int len;
string a;
int o;
int main(){
    cin>>a;
    len=a.size();
    for(int i=0;i<len;i++){
        if(a[i]=='.'){
            kind=2;
            o=i;
            break;
        }
        if(a[i]=='/'){
            kind=3;
            o=i;
            break;
        }
        if(a[i]=='%'){
            kind=4;
            o=i;
            break;
        }
    }
    if(kind==1){
        for(int i=len-1;i>=0;i--){
            if(a[i]!='0'&&!flag){
                flag=1;
            }
            if(flag){
                cout<<a[i];
            }
        }
        if(!flag){
            cout<<0;
        }
    }
    else if(kind==2){
        for(int i=o-1;i>=0;i--){
            if(a[i]!='0'&&!flag){
                flag=1;
            }
            if(flag){
                cout<<a[i];
            }
        }
        if(!flag){
            cout<<0;
        }
        cout<<".";
        o++;
        for(;a[o]=='0';o++);
        flag=0;
        len--;
        if(a[len]!='0'){
            for(;a[len]=='0';len--);
        }
        for(int i=len;i>=o;i--){
            if(a[i]!='0'&&!flag){
                flag=1;
            }
            if(flag){
                cout<<a[i];
            }
        }
        if(!flag){
            cout<<0;
        }
    }
    else if(kind==3){
         for(int i=o-1;i>=0;i--){
            if(a[i]!='0'&&!flag){
                flag=1;
            }
            if(flag){
                cout<<a[i];
            }
        }
        if(!flag){
            cout<<0;
        }
        cout<<"/";
        o++;
        for(;a[o]=='0';o++);
        len--;
        for(;a[len]=='0';len--);
        for(int i=len;i>=o;i--){
            cout<<a[i];
        }
    }
    else if(kind==4){
        for(int i=len-2;i>=0;i--){
            if(a[i]!='0'&&!flag){
                flag=1;
            }
            if(flag){
                cout<<a[i];
            }
        }
        if(!flag){
            cout<<0;
        }
        cout<<"%";
    }
    return 0;
}

Java

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String str = in.nextLine();
        String s[] = new String[2] ;
        if(str.indexOf('.')!=-1) { // 识别小数
        	s = str.split("\\.");
        	turn(s[0]);
        	System.out.print(".");
        	turn(s[1]);
        }else if(str.indexOf('/')!=-1) { // 识别分数
        	s = str.split("/");
        	turn(s[0]);
        	System.out.print("/");
        	turn(s[1]);
        }else if(str.indexOf('%')!=-1) { // 识别百分数
        	s = str.split("%");
        	turn(s[0]);
        	System.out.print("%");
        }else { // 识别整数
        	turn(str);
        }
    }
    // 字符反倒
    public static void turn(String str) {
    	boolean flag1 = false; // 标志前面多余的0
    	boolean flag2 = false; // 标志后面多余的0
    	String s = "";
    	// 去除前面多余的0
    	for(int i=0;i<=str.length()-1;i++) { 
    		if(!flag1 && str.charAt(i)=='0') {
    			continue;
    		}
    		flag1 = true;
    		s += str.charAt(i); // 表示已去除前面0的字符串
        }
    	// 去除后面多余的0
    	for(int i=s.length()-1;i>=0;i--) {
    		if(!flag2 && s.charAt(i)=='0') {
    			continue;
    		}
    		flag2 = true;
			System.out.printf("%s",s.charAt(i));
        }
    	if(str == "" || s == "") {
    		System.out.print("0");
    		return ;
    	}
    }
}

#include<bits/stdc++.h> using namespace std; string s1,s2,a; void f(int l) { for(int i=0;i<l;i++) { s1+=a[i]; } for(int i=l+1;i<a.size();i++) { s2+=a[i]; } } string dx(string s) { string d; int i; if(s.size()1) { return s; } else { for(i=0;i<s.size() && s[i]'0';i++); int x=i; for(i=s.size()-1;i>=x;i--) { d+=s[i]; } return d; } } string d(string s) { string d; int i; if(s.size()1) { return s; } else { for(i=s.size()-1;i>=0 && s[i]'0';i--); for(;i>=0;i--) { d+=s[i]; } return d; } } int main() { ios::sync_with_stdio(false); cin>>a; int l=0; for(int i=0;i<a.size();i++) { if(a[i]'/') { l=i; f(l); cout<<d(s1)+'/'+d(s2); } if(a[i]'.') { l=i; f(l); cout<<d(s1)+'.'+dx(s2); } if(a[i]'%') { if(a[0]'0') { cout<<0<<'%'; return 0; } l=i; a[i]='0'; cout<<d(a)+'%'; } } if(l==0) { cout<<d(a); } return 0; }

#include<bits/stdc++.h> using namespace std; string s1,s2,a; void f(int l) { for(int i=0;i<l;i++) { s1+=a[i]; } for(int i=l+1;i<a.size();i++) { s2+=a[i]; } } string dx(string s) { string d; int i; if(s.size()1) { return s; } else { for(i=0;i<s.size() && s[i]'0';i++); int x=i; for(i=s.size()-1;i>=x;i--) { d+=s[i]; } return d; } } string d(string s) { string d; int i; if(s.size()1) { return s; } else { for(i=s.size()-1;i>=0 && s[i]'0';i--); for(;i>=0;i--) { d+=s[i]; } return d; } } int main() { ios::sync_with_stdio(false); cin>>a; int l=0; for(int i=0;i<a.size();i++) { if(a[i]'/') { l=i; f(l); cout<<d(s1)+'/'+d(s2); } if(a[i]'.') { l=i; f(l); cout<<d(s1)+'.'+dx(s2); } if(a[i]'%') { if(a[0]'0') { cout<<0<<'%'; return 0; } l=i; a[i]='0'; cout<<d(a)+'%'; } } if(l==0) { cout<<d(a); } return 0; }