Use the keyword struct to illustrate a primitive form of class : structure « Structure « C++ Tutorial

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#include <iostream>
#include <math.h>
using namespace std;

struct math_operations {
 double data_value;
  
 void set_value(double ang) {
     data_value=ang;
 }
 double get_square(void) {
     double answer;
     answer=data_value*data_value;                          
     return (answer);
 }
 double get_square_root(void) {
     double answer;
     answer=sqrt(data_value);
     return (answer);
 }
} math;

int main( )
{
 math.set_value(35.63);

 cout << "The square of the number is: "
      << math.get_square( ) << endl;
 cout << "The square root of the number is: "
      << math.get_square_root( ) << endl;
 return (0);
}