在 C 中返回数组? [英] Return Array in C?
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问题描述
我无法在 C 中返回数组,我对 C 很陌生,所以我可能会犯一些有趣的错误,这里是代码:
I cant return array in c,i am quite new to C so i probably do some kind of funny mistake, here is the code:
#define MAXSIZE 100
int recievedNumbers[MAXSIZE];
void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
}
void loop() {
// put your main code here, to run repeatedly:
recievedNumbers = getACOfNumber(256);
for (int i = 0; i < sizeof(recievedNumbers) / 8; i++) {
Serial.print(recievedNumbers[i]);
}
Serial.println();
}
int* getACOfNumber(int theNumber) {
bool done = false;
int i = 0;
int theArray[100];
while (!done) {
if (theNumber % 2 == 0) {
theNumber = theNumber / 2;
theArray[i] = 2;
} else if (theNumber % 3 == 0) {
theNumber = theNumber / 3;
theArray[i] = 3;
}
else if (theNumber % 5 == 0) {
theNumber = theNumber / 5;
theArray[i] = 5;
}
else if (theNumber % 7 == 0) {
theNumber = theNumber / 7;
theArray[i] = 7;
} else {
theArray[i] = theNumber;
done = true;
}
i++;
}
return theArray;
}
错误信息:
AC:10: 错误:'int*' 到 'int 的赋值中的类型不兼容[100]'
AC:10: error: incompatible types in assignment of 'int*' to 'int [100]'
在将int*"分配给int"时退出状态 1 不兼容的类型[100]'
exit status 1 incompatible types in assignment of 'int*' to 'int [100]'
推荐答案
不能从表达式赋值给数组:
You can not assign to an array from an expression:
int recievedNumbers[MAXSIZE];
...
recievedNumbers = getACOfNumber(256);
相反:
memcpy(receivedNumbers, getACOfNumber(256), sizeof(receivedNumbers));
注意您正在使用一个生命周期以函数结束的本地数组,更改为
An notice that you are using a local array whose lifetime ends with the function, change to
static int theArray[100];
或者更好
int *theArray = calloc(100, sizeof(*theArray)); /* Zero initializes the array */
不要忘记在最后调用free
:
int *temp = getACOfNumber(256);
memcpy(receivedNumbers, temp, sizeof(receivedNumbers));
free(temp);
但是为什么不将原始数组传递给函数呢?:
But why don't you pass the original array to the function?:
getACOfNumber(receivedNumbers);
...
void getACOfNumber(int *theArray) {
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