函數參數的傳遞

1.函數的引用傳遞

void Exchg2(int &x, int &y)

{

int tmp=x;

x=y;

y=tmp;

printf("x=%d,y=%d
",x,y); //6 4

}

void main()

{

int a=4;

int b=6;

Exchg2(a,b);

printf("a=%d,b=%d
", a, b); //6 4

}

2.函數的地址傳遞

Exchg2(int *px, int *py)

{

int tmp=*px;

*px=*py;

*py=tmp;

printf("*px=%d,*py=%d
",*px,*py); //6 4

}

main()

{

int a=4;

int b=6;

Exchg2(&a,&b);

print("a=%d,b=%d
", a, b); //6 4

}

3.函數的值傳遞

void Exchg1(int x, int y)

{

int tmp;

tmp=x;

x=y;

y=tmp;

printf("x=%d,y=%d
",x,y); //6 4

}

void main()

{

int a=4,b=6;

Exchg1 (a,b) ;

printf("a=%d,b=%d
",a,b); //4 6

}

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