в 14:21, 25 мая 2010

2010-05-25T14:21:17Z

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2010-05-25T10:29:14Z

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==Pass structure to a function==

<source lang="cpp">#include <cmath>
#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>
<pre class=codeResult>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</pre>

==Pass structure to a function as a pointer==

<source lang="cpp">#include<iostream.h>
#include<stdio.h>
#include<stdlib.h>
#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>
<pre class=codeResult>12345
li li
67.5
89
78.6
"</pre>

==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>
<pre class=codeResult>The area is 138</pre>

==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>

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в 14:21, 25 мая 2010

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