Shulou(Shulou.com)06/01 Report--

This article introduces the knowledge of "C language function return value and parameter transfer example analysis". In the operation of actual cases, many people will encounter such a dilemma. Next, let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

One: parameter transfer

Parameter transfer is indispensable in the functions of C language, which can be used to pass values and pointers.

1. The form of passing a value: just pass a copy of the parameter value to the function, not the parameter ontology, such as:

Int test (int x pencil int y) {xfei2quoy; return x;} int main (void) {int adept% d, test (a); return 0;}

The running result is:

10,0

That is, the value-passing method can only pass the argument to the function, not change the argument itself.

two。 Pass pointer form: the address of the variable is passed directly to the function.

Such as:

Int a (int bjinint * c) {int item0; for (item0 witi 0)

Data is-> 2

Data is-> 4

Data is-> 6

Because the tuned function is within the scope of the parameter pointer, the ontology of the variable can be changed directly at this time.

Two: return value

The function returns a value in addition to passing parameters, which can return both the value of the variable and the address.

1. Return variable

Such as:

Int a (int b) {int iTun5; return 5;} int main (void) {int bread2; printf ("Data is->% d", a (b)); return 0;}

Running result

Data is-> 10

two。 Return address

Int * test (int b) {int iTuno BUF [4]; for

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