C++ Tutorial/Structure/structure parameter

Pass structure to a function

<source lang="cpp">#include <cmath>

1. include <iostream>

using namespace std; // define the structures struct DataStructure {

 float radius;
 double angle;

}; struct ResultStructure {

 float area;
 double sine;
 double cosine;
 double tangent;

}; ResultStructure compute(struct DataStructure mystruct); int main () {

   DataStructure input;
      ResultStructure output;
      input.radius = 3;
      input.angle = 0.8;
      output = compute(input);
   cout << " The area is "<< output.area << "\n";
      cout << " The sine of the angle is " << output.sine << "\n";
      cout << " The cosine of the angle is " << output.cosine << "\n";
   cout << " The tangent of the angle is " << output.tangent << "\n";
      return 0;

} ResultStructure compute(struct DataStructure mystruct) {

    ResultStructure answer;
       answer.area = pow(mystruct.radius,2);
       answer.sine = sin(mystruct.angle);
       answer.cosine = cos(mystruct.angle);
       answer.tangent = tan(mystruct.angle);
       return answer;

};</source>

The area is 9
 The sine of the angle is 0.717356
 The cosine of the angle is 0.696707
 The tangent of the angle is 1.02964

Pass structure to a function as a pointer

<source lang="cpp">#include<iostream.h>

1. include<stdio.h>
2. include<stdlib.h>
3. include<string.h>

struct student {

      char name[20];
      int num;
      float score[3];

}; void print(struct student *p) {

      cout<<p->num<<"\n"<<p->name<<"\n"<<p->score[0]<<"\n"
              <<p->score[1]<<"\n"<<p->score[2]<<"\n";
      cout<<" ";

} int main() {

      struct student stu;
      stu.num=12345;
      strcpy(stu.name,"li li");
      stu.score[0]=67.5;
      stu.score[1]=89;
      stu.score[2]=78.6;
      print(&stu);

}</source>

12345
li li
67.5
89
78.6
 "

Pass structure using a structure reference

<source lang="cpp">#include <iostream> using namespace std; struct ResultStructure {

 float base;
 float height;
 float area;

}; void f(struct ResultStructure &area); int main () {

      ResultStructure myResultStructure;

   myResultStructure.base = 12;
   myResultStructure.height = 23;
   f(myResultStructure);
   cout << "The area is " << myResultStructure.area << " \n";
  return 0;

}

void f(ResultStructure &area) {

  area.area = .5f * (area.base * area.height);

}</source>

The area is 138

structure variables as array elements

<source lang="cpp">#include <iostream>

 using namespace std;  
 const int SIZE = 4;  
 struct part{  
    int modelnumber;              
    int partnumber;               
    float cost;                   
 };  
 int main(){  
    int n;  
    part apart[SIZE];
   
    for(n=0; n<SIZE; n++){  
       cout << endl;  
       cout << "Enter model number: ";  
       cin >> apart[n].modelnumber;
       cout << "Enter part number: ";  
       cin >> apart[n].partnumber; 
       cout << "Enter cost: ";  
       cin >> apart[n].cost;       
    }  
    
    for(n=0; n<SIZE; n++) {  
       cout << "Model " << apart[n].modelnumber;  
       cout << "  Part "  << apart[n].partnumber;  
       cout << "  Cost "  << apart[n].cost << endl;  
    }  
    return 0;  
 }</source>