c++ - how to include class member function inside another class member function -

i need access class member function inside class member function, guess code reuse about. anyways have class , class header file. class has 1 member function calculate average of column in vector. need access average function in function instance datastandardization function below.

class.cpp has 2 member function below

float table::datatsandardization(int row, int col){      float tablevalue,avg=0;      return avg;  } 

another member function calculate average:

float table::displaycolaverage(int col){     float sum=0.0,ave;   for(register unsigned int i=0; i<vec.size(); i++)     {          sum = sum + vec[i][col];      }  return ave=sum/vec.size();  } 

now need include average function inside standardization function: example want this:

float table::datatsandardization(int row, int col){          float tablevalue,avg=0;          avg = displaycolaverage(int col);         return avg;      } 

thanks looking @ problem.