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原标题:return value of malloc
  • 时间:2010-08-27 15:43:22
  •  标签:
  • c

我有以下法典部分:

typedef struct Board* BoardP;

typedef struct Board {
    int _rows;
    int _cols;
    char *_board;

} Board;

char* static allocateBoard(BoardP boardP, int row, int col) {

    boardP->_rows = row;
    boardP->_cols = col;
    boardP->_board = malloc(row * col * sizeof(char));

    return boardP->_board;
}

i can t seem to figure out why it gives the error expected identifier or ‘(’ before ‘static’ it gives the error after i changed return type to be char*. when it was void no error was given.

还有一个问题: i 教授的是,在使用小型电池时需要投放,但似乎在没有 cast子的情况下工作。 在这种情况下需要吗?

感谢

最佳回答

您的职能原型需要:

static char* allocateBoard(BoardP boardP, int row, int col)

无需在C版<代码>()上投放;然而,它位于C++。

问题回答

改变您的职能

static char* allocateBoard(BoardP boardP, int row, int col):

The return value of malloc is a void*, and in C (unlike C++), a void* is implicittly convertible to any other pointer type - except function pointers. so you don t need a cast.

在C,需要为小型工业提供食宿,因为没有空白* 类型(可能作为某些C汇编者的延伸),但是,在ANSI C之后,如果你这样做的话,你就根本不需要投放,那么你就会压制汇编者的某些有用的诊断,而这种诊断对你的方案更有害。 在C区,从未放过小区。

虽然在此案中所投的内容对你有利。 有人建议,在你试图将其分配到不同类别之前,你会把事情做成 ha。 它后来拯救了许多痛苦。 在将这一法典纳入C++时,它节省了许多时间。





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