в 14:21, 25 мая 2010

2010-05-25T14:21:06Z

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2010-05-25T10:27:24Z

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==Compute area of a rectangle using overloaded functions.==

<source lang="cpp">

#include <iostream>
using namespace std;
double rect_area(double length, double width)
{
return length * width;
}
double rect_area(double length)
{
return length * length;
}
int main()
{
cout << "10 x 5.8 rectangle has area: ";
cout << rect_area(10.0, 5.8) << "\n";
cout << "10 x 10 square has area: ";
cout << rect_area(10.0) << "\n";
return 0;
}

</source>

==Create three functions called prompt( ) that perform this task for data of types int, double, and long==

<source lang="cpp">
#include <iostream>
using namespace std;
void prompt(char *str, int *i);
void prompt(char *str, double *d);
void prompt(char *str, long *l);

int main(void){
int i;
double d;
long l;

prompt("Enter an integer: ", &i);
prompt("Enter a double: ", &d);
prompt("Enter a long: ", &l);

cout << i << " " << d << " " << l;

return 0;
}

void prompt(char *str, int *i)
{
cout << str;
cin >> *i;
}

void prompt(char *str, double *d)
{
cout << str;
cin >> *d;
}

void prompt(char *str, long *l)
{
cout << str;
cin >> *l;
}

</source>

==function overloading between int and string type==

<source lang="cpp">
#include <iostream>
#include <string>
using namespace std;
int triple(int number);
string triple(string text);
int main(){
cout << "Tripling 5: " << triple(5) << "\n\n";
cout << "Tripling "gamer": " << triple("gamer");
return 0;
}
int triple(int number){
return (number * 3);
}
string triple(string text){
return (text + text + text);
}

</source>

==Functions differ in number of parameters==

<source lang="cpp">
#include <iostream>
using namespace std;
int myFunction(int i);
int myFunction(int i, int j);
int main()
{
cout << myFunction(10) << " "; // calls myFunction(int i)
cout << myFunction(4, 5); // calls myFunction(int i, int j)
return 0;
}
int myFunction(int i)
{
return i;
}
int myFunction(int i, int j)
{
return i*j;
}

</source>

==Overload abs() three ways==

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

int abs(int n);
double abs(double n);
int main()
{
cout << "Absolute value of -10: " << abs(-10) << endl;
cout << "Absolute value of -10.01: " << abs(-10.01) << endl;
return 0;
}
int abs(int n)
{
cout << "In integer abs()\n";
return n<0 ? -n : n;
}

double abs(double n)
{
cout << "In double abs()\n";
return n<0 ? -n : n;
}

</source>

==Overload function: int and float==

<source lang="cpp">
#include <iostream>
using namespace std;
int difference(int a, int b)
{
return a-b;
}
float difference(float a, float b)
{
return a-b;
}
int main()
{
int (*p1)(int, int);
float (*p2)(float, float);
p1 = difference; // address of difference(int, int)
p2 = difference; // address of difference(float, float);
cout << p1(10, 5) << " ";
cout << p2(10.5, 8.9) << "\n";
return 0;
}

</source>

==Overload function: int and long==

<source lang="cpp">
#include <iostream>
using namespace std;
int rotate(int i);
long rotate(long i);
int main()
{
int a;
long b;
a = 0x8000;
b = 8;
cout << rotate(a);
cout << endl;
cout << rotate(b);

return 0;
}
int rotate(int i)
{
int x;

if(i & 0x8000) x = 1;
else x = 0;
i = i << 1;
i += x;
return i;
}
long rotate(long i)
{
int x;

if(i & 0x80000000) x = 1;
else x = 0;
i = i << 1;
i += x;
return i;
}

</source>

==Overload function to accept integer or char * argument==

<source lang="cpp">
#include <iostream>
using namespace std;
void sleep(int n);
void sleep(char *n);
#define DELAY 100000
int main()
{
cout << ".";
sleep(3);
cout << ".";
sleep("2");
cout << ".";
return 0;
}
// Sleep() with integer argument.
void sleep(int n)
{
long i;
for( ; n; n--)
for(i = 0; i <DELAY; i++) ;
}
// Sleep() with char * argument.
void sleep(char *n)
{
long i;
int j;
j = atoi(n);
for( ; j; j--)
for(i = 0; i <DELAY; i++) ;
}

</source>

==Overload the min() function.==

<source lang="cpp">
#include <iostream>
#include <cctype>
using namespace std;
char min(char a, char b);
int min(int a, int b);
double min(double a, double b);
int main()
{
cout << "Min is: " << min("x", "a") << endl;
cout << "Min is: " << min(10, 20) << endl;
cout << "Min is: " << min(0.2234, 99.2) << endl;
return 0;
}
// min() for chars
char min(char a, char b)
{
return tolower(a)<tolower(b) ? a : b;
}
// min() for ints
int min(int a, int b)
{
return a<b ? a : b;
}
// min() for doubles
double min(double a, double b)
{
return a<b ? a : b;
}

</source>

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