将可变大小的多维C数组初始化为零 [英] initialize a multidimensional C array of variable size to zero

问题描述

我想将尺寸可变的二维数组初始化为零.我知道可以对固定大小的数组完成此操作:

I want to initialize a two-dimensional array of variable size to zero. I know it can be done for a fixed-sized array:

int myarray[10][10] = {0};

但是如果我这样做是行不通的:

but it is not working if I do this:

int i = 10;
int j = 10;
int myarray[i][j] = {0};

是否有一种单行方式来执行此操作，还是必须遍历数组的每个成员?

Is there a one-line way of doing this or do I have to loop over each member of the array?

谢谢

推荐答案

您无法使用初始化程序对其进行初始化，但可以将数组 memset()设置为0.

You cannot initialize it with an initializer, but you can memset() the array to 0.

#include <string.h>

int main(void) {
  int a = 13, b = 42;
  int m[a][b];
  memset(m, 0, sizeof m);
  return 0;
}

注意:这是 C99 .在 C89 中声明m( int m [a] [b]; )是错误.

Note: this is C99. In C89 the declaration of m ( int m[a][b]; ) is an error.

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