Question

Write a C++ function that reads a .csv file(file contains rows of string(name) and number) into a vector and loop through that vector and find the max number.

Answer 1

#include <iostream>
#include <iomanip>
#include <fstream>
#include <sstream>
#include <vector>

using namespace std;

vector<string> readFile(string file) {
        ifstream f(file.c_str());

        vector<string> lines;
        string line;

        while(f >> line) {
                lines.push_back(line);
        }

        f.close();
        return lines;
}

int main() {
        vector<string> lines = readFile("input.csv");

        // Find max number.
        int max = 0;

        for(int i=0; i<lines.size(); i++) {
                string line = lines[i];

                stringstream ss(line);
                int x;
                string n;

                // read till comma
                getline(ss, n, ',');
                
                if(ss.peek() == ',') {
                        ss.ignore();
                }
                ss >> x;

                if(x > max) {
                        max = x;
                }
        }
        
        cout << "the max number from file is: " << max << endl;
}

===============

input.csv:
First,23
Second,43
Third,56

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