why is the median, mean ,and mode functions cause errors?

Question

/******************************************************************************

Welcome to GDB Online.

  GDB online is an online compiler and debugger tool for C, C++, Python, PHP, Ruby,

  C#, OCaml, VB, Perl, Swift, Prolog, Javascript, Pascal, COBOL, HTML, CSS, JS

  Code, Compile, Run and Debug online from anywhere in world.

*******************************************************************************/

#include <iostream>

#include <vector>

#include <algorithm>

#include <cmath>

#include <string>

using namespace std;

int main() {

int laoganma_michael;

cin>>laoganma_michael;

vector<int> grades;

for(int i = 0; i<laoganma_michael; i++) {

int thing;

cin>>thing;

grades.push_back(thing);

}

vector<string>names;

for(int j = 0; j<laoganma_michael; j++) {

string aoteman;

cin>>aoteman;

names.push_back(aoteman);

cout<<calculateMean(grades)<<endl

    cout<<calculateMode(grades)<<endl

    cout<<calculateMedian(grades)<<endl

}

    

return 0;

}

Answer 1

The compilation error happens because none of

• calculateMean()
• calculateMode()
• calculateMedian()

function exists in your code (or in the imported libraries).

You'd have to implement them yourself.

Answer 2

You are calling those as functions [  also as USER DEFIND FUCNTION ]  , but you are not defining it's body, means what to perform if those functions are called. 

And if you are trying to use the INBUILT METHODS , but as such i know there is NO INBUILT METHODS to calculate them.

And also there is semicolon error at the end of each calling function 

    cout<<calculateMean(grades)<<endl ;
    cout<<calculateMode(grades)<<endl ;
    cout<<calculateMedian(grades)<<endl ;