One, C + + learning (function invocation)

1. Value Call

When using a call-to-value method, the argument of the calling function uses a constant, a variable value, or an expression value, and the parameter of the called function uses the value of the variable

void swap (int x,int y)

{

int temp;

Temp=x; X=y; Y=temp;

}

This function does not implement the function of the interchange position, because the actual parameter to the formal parameter is one-way pass.

2. Address Call

When using a call-to-address method, the arguments of the calling function use the addresses value, and the parameters of the called function use pointers.

void swap (int *x,int *y)

{

int temp;

Temp=*x; *x=*y; *y=temp;

}

This function can be used for exchanging position functions.

3. Reference calls

A reference is an individual name for a known variable, and a reference operation to a variable referenced by it.

void swap (int &x,int &y)

{

int temp;

Temp=x; X=y; Y=temp;

}

This function can also implement its function.

One, C + + learning (function invocation)