Question

How to write a macro that get array size of any data type in C

Answer 1

#include <stdio.h>

#define ASIZE(x) (sizeof (x) / sizeof (*x))

int main(int argc, char **argv)
{
	int intArr[7] = {1, 2, 3, 4, 5};
	char *stringArr[9] = {"c", "c++", "java", "php"};
	float floatArr[5] = {3.14, 5.68};

	printf("%I64d\n", ASIZE(intArr));
	printf("%I64d\n", ASIZE(stringArr));
	printf("%I64d\n", ASIZE(floatArr));

    return 0;
}

/*
run:

7
9
7

*/

 

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Answer 2

#include <stdio.h>

#define ASIZE(x) (sizeof (x) / sizeof (*x))

int main(int argc, char **argv)
{
	int intArr[] = {1, 2, 3, 4, 5};
	char *stringArr[] = {"c", "c++", "java", "php"};
	float floatArr[] = {3.14, 5.68};

	printf("%I64d\n", ASIZE(intArr));
	printf("%I64d\n", ASIZE(stringArr));
	printf("%I64d\n", ASIZE(floatArr));

    return 0;
}

/*
run:

5
4
2

*/

 

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