C：无法iniitliaze与一维数组二维数组爱特梅尔工作室

Question

所以我想通过以下操作来创建一个二维数组：

unsigned char seqA[] = {1, 2, 3, 4, 5, 1, 2, 3, 4, 5}; 
unsigned char seqB[] = {1, 2, 3, 4, 4, 1, 2, 3, 4, 4}; 
unsigned char seqC[] = {3, 2, 1, 5, 4, 3, 2, 1, 5, 4}; 
unsigned char seqD[] = {1, 1, 2, 2, 3, 3, 4, 4, 5, 5}; 
unsigned char seq[][10] = {seqA, seqB, seqC, seqD}; 

而且我从试图获得大量的错误要做到这一点：

Warning 1 missing braces around initializer [-Wmissing-braces] C:\Users\Jonathan\Documents\Atmel Studio\6.2\GccApplication3\GccApplication3\GccApplication3.c 135 1 GccApplication3 
Warning 2 (near initialization for 'seq[0]') [-Wmissing-braces] C:\Users\Jonathan\Documents\Atmel Studio\6.2\GccApplication3\GccApplication3\GccApplication3.c 135 1 GccApplication3 
Warning 3 initialization makes integer from pointer without a cast [enabled by default] C:\Users\Jonathan\Documents\Atmel Studio\6.2\GccApplication3\GccApplication3\GccApplication3.c 135 1 GccApplication3 
Warning 4 (near initialization for 'seq[0][0]') [enabled by default] C:\Users\Jonathan\Documents\Atmel Studio\6.2\GccApplication3\GccApplication3\GccApplication3.c 135 1 GccApplication3 
Error 5 initializer element is not computable at load time C:\Users\Jonathan\Documents\Atmel Studio\6.2\GccApplication3\GccApplication3\GccApplication3.c 135 1 GccApplication3 
Error 6 (near initialization for 'seq[0][0]') C:\Users\Jonathan\Documents\Atmel Studio\6.2\GccApplication3\GccApplication3\GccApplication3.c 135 1 GccApplication3 
Warning 7 initialization makes integer from pointer without a cast [enabled by default] C:\Users\Jonathan\Documents\Atmel Studio\6.2\GccApplication3\GccApplication3\GccApplication3.c 135 1 GccApplication3 
Warning 8 (near initialization for 'seq[0][1]') [enabled by default] C:\Users\Jonathan\Documents\Atmel Studio\6.2\GccApplication3\GccApplication3\GccApplication3.c 135 1 GccApplication3 
Error 9 initializer element is not computable at load time C:\Users\Jonathan\Documents\Atmel Studio\6.2\GccApplication3\GccApplication3\GccApplication3.c 135 1 GccApplication3 
Error 10 (near initialization for 'seq[0][1]') C:\Users\Jonathan\Documents\Atmel Studio\6.2\GccApplication3\GccApplication3\GccApplication3.c 135 1 GccApplication3 
Warning 11 initialization makes integer from pointer without a cast [enabled by default] C:\Users\Jonathan\Documents\Atmel Studio\6.2\GccApplication3\GccApplication3\GccApplication3.c 135 1 GccApplication3 
Warning 12 (near initialization for 'seq[0][2]') [enabled by default] C:\Users\Jonathan\Documents\Atmel Studio\6.2\GccApplication3\GccApplication3\GccApplication3.c 135 1 GccApplication3 
Error 13 initializer element is not computable at load time C:\Users\Jonathan\Documents\Atmel Studio\6.2\GccApplication3\GccApplication3\GccApplication3.c 135 1 GccApplication3 
Error 14 (near initialization for 'seq[0][2]') C:\Users\Jonathan\Documents\Atmel Studio\6.2\GccApplication3\GccApplication3\GccApplication3.c 135 1 GccApplication3 
Warning 15 initialization makes integer from pointer without a cast [enabled by default] C:\Users\Jonathan\Documents\Atmel Studio\6.2\GccApplication3\GccApplication3\GccApplication3.c 135 1 GccApplication3 
Warning 16 (near initialization for 'seq[0][3]') [enabled by default] C:\Users\Jonathan\Documents\Atmel Studio\6.2\GccApplication3\GccApplication3\GccApplication3.c 135 1 GccApplication3 
Error 17 initializer element is not computable at load time C:\Users\Jonathan\Documents\Atmel Studio\6.2\GccApplication3\GccApplication3\GccApplication3.c 135 1 GccApplication3 
Error 18 (near initialization for 'seq[0][3]') C:\Users\Jonathan\Documents\Atmel Studio\6.2\GccApplication3\GccApplication3\GccApplication3.c 135 1 GccApplication3 

我在做什么错了？

Answer 1

seq是char类型的数组，您试图用address to char进行初始化。

更换

unsigned char seq[][10] = {seqA, seqB, seqC, seqD}; 

与

unsigned char* seq[] = {seqA, seqB, seqC, seqD}; 

现在，如果你想读的seqA 3元，然后使用：

*(seq[0] +2) OR seq[0][2]

Answer 2

除非有特殊原因，命名个人r OWS，最有效的（并且，在我看来，最清晰的）事会

static const unsigned char seq[][10] = 
    { {1, 2, 3, 4, 5, 1, 2, 3, 4, 5}, 
    {1, 2, 3, 4, 4, 1, 2, 3, 4, 4}, 
    {3, 2, 1, 5, 4, 3, 2, 1, 5, 4}, 
    {1, 1, 2, 2, 3, 3, 4, 4, 5, 5} }; 

我还添加了const，其中，提供的数据实在是恒定的，可以帮助优化器在某些做得更好情况和static，这表明seq只在该文件中使用（如果是这种情况）。

如果seq只在一个特定的函数中使用，您可以通过将其移动到该函数中来进一步考虑。在这种情况下，你肯定会想要static，因为编译器必须生成代码才能将值放入堆栈中。

使用指针解决方案，您将有四个额外的指针和一个额外的指针解引用为每个访问。