C语言 如何在 Arduino 或 C 中调用函数并检索两个返回值？
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How to call function and retrieve two returns in Arduino or C?
提问by Abdelrahman Elshafiey
I made a function, and I want to retrieve two returns, not a single return such as this example:
我做了一个函数，我想检索两个返回，而不是一个返回，比如这个例子：
long Conv(double num){
long a,b;
a = floor(num);
b = num * pow(10,6) - a * pow(10,6);
return a;
return b;
}
When I call the function
当我调用函数时
long a = Conv(30.233456);
the question is: how do I retrieve b?
问题是：我如何检索b？
回答by
You can't return two times at once.
你不能一次返回两次。
You could pass b to your function by reference.
您可以通过引用将 b 传递给您的函数。
yourfunction( long a , long* b )
{
*b = a + 10;
//more code
return a;
}
a = yourfunction(a , &b );
回答by meyumer
You can't return more than one value from a function in C.Either return a struct, or pass by reference and modify in the function.
不能从 C 中的函数返回多个值。要么返回 a struct，要么通过引用传递并在函数中进行修改。
Example 1: struct
示例 1： struct
struct ab {
long a;
long b;
}
struct ab Conv(double num) {
struct ab ab_instance;
ab_instance.a = floor(num);
ab_instance.b = num * pow(10,6) - a * pow(10,6);
return ab_instance;
}
Example 2: pass b by reference
示例 2： pass b by reference
long Conv(double num, long& b) {
long a;
a = floor(num);
b = num * pow(10,6) - a * pow(10,6);
return a;
}
回答by Steve Westbrook
Armin kind of answered it, but here is some sample code:
Armin 有点回答它，但这里有一些示例代码：
int get_both(int* b) {
a = 0;
*b = 1;
return a;
}
