2D array processing using functions

The example below shows how to create a 2D array, pass it to get initialized, and then pass it to be displayed.

Remember that arrays in C are always passed by reference and not by value.

Record structures in C, on the other hand, can be passed by value or by reference (address/pointer). Here is the C code.

#include <stdio.h>
#define RMAX 3
#define CMAX 4

void gridInit(int grid1[RMAX][CMAX]) {
	int rpos1 = 0;
	while (rpos1 != RMAX) {
		int cpos1 = 0;
		while (cpos1 != CMAX) {
			grid1[rpos1][cpos1] = rpos1+cpos1;
			cpos1 += 1;
			}
		rpos1 += 1;
		}
	}

void gridShow(int grid1[RMAX][CMAX]) {
	printf("(begin grid)\n");
	int rpos1 = 0;
	while (rpos1 != RMAX) {
		int cpos1 = 0;
		while (cpos1 != CMAX) {
			int value1 = grid1[rpos1][cpos1];
			printf("\tr=%d c=%d v=%d\n",rpos1,cpos1,value1);
			cpos1 += 1;
			}
		rpos1 += 1;
		}
	printf("(end grid)\n");
	}

int main() {
	printf("(begin main)\n");
	int grid1 [RMAX][CMAX];
	gridInit(grid1);
	gridShow(grid1);
	printf("(end main)\n");
	return 0;
	}

Here is the output of the C code.

(begin main)
(begin grid)
	r=0 c=0 v=0
	r=0 c=1 v=1
	r=0 c=2 v=2
	r=0 c=3 v=3
	r=1 c=0 v=1
	r=1 c=1 v=2
	r=1 c=2 v=3
	r=1 c=3 v=4
	r=2 c=0 v=2
	r=2 c=1 v=3
	r=2 c=2 v=4
	r=2 c=3 v=5
(end grid)
(end main)