Question

Convert Code from Java to C++

Convert :

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class Template {
public static void main(String args[]) {
Scanner sc1 = new Scanner(System.in); //Standard input data
String[] line1 = sc1.nextLine().split(","); //getting input and spliting on basis of ","
String[] line2 = sc1.nextLine().split(" "); //getting input and spiliting on basis of " "
  
Map<String, String> mapping = new HashMap<String, String>();
for(int i=0;i<line1.length;i++) {
mapping.put(line1[i].split("=")[0], line1[i].split("=")[1]); //string in map where in [] as key and other as value
}
for(int i=0;i<line2.length;i++) {
if(line2[i].contains("[")) { //check whether it is word or word-template
String temp = line2[i].substring(1,line2[i].length()-1); //removing [] from string and checking the key
line2[i]=mapping.get(temp); //getting the value of defined key from map
}
System.out.print(line2[i]+" "); //printing the array string with spaces.
}
sc1.close(); //closing the input buffer
}
}

Example input
person=Paul,action=strolls around,place=the park
[person] [action] [place]

Example output
Paul strolls around the park

Answer 1

All the explanation is in the code comments. Hope it helps!

Code:

#include<bits/stdc++.h>
#include <unordered_map>

using namespace std;

// function to split string according to given delimiter
vector <string> split_line(string input,string delim)
{
// resultant array of string
vector <string> result;
size_t prev = 0, pos = 0;
  
// loop till end of string
while (pos < input.length() && prev < input.length())
{
// get the next delimiter index
pos = input.find(delim, prev);
if (pos == string::npos)
{
// for end of index
pos = input.length();
}
// get the substring
string token = input.substr(prev, pos-prev);

// push the result in the array
if (!token.empty()) result.push_back(token);
prev = pos + delim.length();
}
  
// return result
return result;
}

int main(){

string input1,input2;
  
// get input of 2 lines
getline(cin,input1);
getline(cin,input2);
  
// split the strings
vector <string> line1 = split_line(input1,",");
vector <string> line2 = split_line(input2," ");

// corresponding to hashmap in java
unordered_map<string,string> mapping;

for (int i = 0; i < line1.size(); i++)
{
// split the string before and after '='
vector <string> temp = split_line(line1[i],"=");
// put key and value in map
mapping[temp[0]]=temp[1];
}
  
for (int i = 0; i < line2.size(); i++)
{
// get the template type in given position
string temp = line2[i].substr(1,line2[i].size() - 2);
  
// get the template value from map
line2[i] = mapping[temp];
// print it
cout << line2[i] << " ";
}
  
return 0;
}

Sample run:

Code screenshots: