Question

How to determine the size (row, col) of two dimensional array (array[][]) in C

Answer 1

#include <stdio.h>
 
int main(void)
{
    char s[][5] = { "AB12" , "CD98" , "AB34" };
 
	printf("char size: %d\n", (int)sizeof(char));
	printf("Total size: %d\n", (int)sizeof(s));
    printf("Col size: %d\n", (int)sizeof(s[0]));
    printf("Row size: %d\n", (int)(sizeof(s)/sizeof(s[0])));
     
    return 0;
}
 
  
/*
    
run:
    
char size: 1
Total size: 15 // 5 x 3
Col size: 5
Row size: 3
 
*/

 

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Answer 2

#include <stdio.h>

int main(void)
{
	int n[][5] = { {12 , 652 , 7}, {23, 54, 98}, {98, 48, 100} };

	printf("int size: %d\n", (int)sizeof(int));
	printf("Total size: %d\n", (int)sizeof(n));
	printf("Col size: %d\n", (int)sizeof(n[0]));
	printf("Row size: %d\n", (int)(sizeof(n)/sizeof(n[0])));
	
	return 0;
}

 
/*
   
run:
   
int size: 4
Total size: 60 // 5 x 4 x 3
Col size: 20 // 5 x 4
Row size: 3

*/

 

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