//

函数返回值为引用

#include

<

iostream.h

>

int

a[]

=

{

1

,

3

,

5

,

7

,

9

};

int

&

index(

int

);

//

声明返回引用的函数

void

main()

{

cout

<<

index(

2

)

<<

endl;

index(

2

)

=

25

;

//

a[2] = 25;

cout

<<

index(

2

)

<<

endl;

}

//

引用就是变量的别名,这里是返回一个别名,一个变量的别名

int

&

index(

int

i)

{

return

a[i];

}

//

引用举例

#include

<

iostream

>

using

namespace

std;

int

&

max(

int

&

num1,

int

&

num2);

int

&

min(

int

&

num1,

int

&

num2);

void

main()

{

int

n1,n2;

cout

<<

"

Enter two numbers:

"

;

cin

>>

n1

>>

n2;

max(n1,n2) = 0;

cout

<<

"

\nAftrer putting zero in largest,then numbers are:

"

<<

n1

<<

"

and

"

<<

n2

<<

endl;

cout

<<

"

Enter two numbers:

"

;

cin

>>

n1

>>

n2;

min(n1,n2)

=

0

;

cout

<<

"

\nAftrer putting zero in smallest,then numbers are:

"

<<

n1

<<

"

and

"

<<

n2

<<

endl;

}

int

&

max(

int

&

num1,

int

&

num2)

{

return

(num1

>

num2

?

num1:num2);

}

int

&

min(

int

&

num1,

int

&

num2)

{

return

(num1

<

num2

?

num1:num2);

}