update,

_prompts/step3/prompt.md

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+write some cpp functions:
+
+- User can add, edit and delete the record to the system manually or upload a file.
+
+using cpp, write a console program that accepts:
+  user input a csv file path
+
+the program then parse the inputted csv file and insert the record
+
+```
+name,maths,chinese,english
+apple,99,98,99
+banana,99,98,99
+```
+
+

_prompts/step3/test.txt

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+burger 15
+fries 11
+ice-cream 9

_prompts/step3/write_file.cpp

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+#include <iostream>
+#include <fstream>
+#include <iomanip>
+#include <string>
+
+using namespace std;
+
+int main(){
+    //Declare variables
+    ifstream inFile;
+    ofstream outFile;
+    string burger_name, fries_name, icecream_name;
+    int burger_price, fries_price, icecream_price;
+    //Open the input file and output file
+    inFile.open("price.txt");
+
+    if (!inFile) {
+        cout << "Cannot open the input file."
+        << "The program terminates." << endl;
+        return 1;
+    }
+
+    outFile.open("price_output.out");
+    cout << "Processing data" << endl;
+
+    //Read file word by word
+    inFile >> burger_name >> burger_price;
+    inFile >> fries_name >> fries_price;
+    inFile >> icecream_name >> icecream_price;
+
+    //Output file
+    outFile << "The price of " << burger_name
+        << " is $" << burger_price <<"." << endl;
+
+    outFile << "The price of " << fries_name
+        << " is $" << fries_price << "." << endl;
+
+    outFile << "The price of " << icecream_name
+        << " is $" << icecream_price << "." << endl;
+    inFile.close(); // .close(): close a file
+    outFile.close();
+    cout << "Processing completed" << endl;
+
+    return 0;
+}