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#include <stdio.h>
#include <stdlib.h>
 
int main(void)
{
	unsigned int m_row = 3;
	unsigned int m_col = 5;
	int** m = (int**)malloc(m_row * sizeof(int*));
 
	for (unsigned int i = 0; i < m_row; ++i)
		m[i] = (int*)malloc(m_col * sizeof(int));
 
	/* here we go with coding */
 
	for (unsigned int i = 0; i < m_row; ++i)
		free(m[i]); /*obligatory memory free: step 1/2*/
 
	free(m); /*obligatory memory free: step 2/2*/
 
	return 0;
}

prog.c: In function 'main':
prog.c:10:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
  for (unsigned int i = 0; i < m_row; ++i)
  ^
prog.c:10:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
prog.c:15:20: error: redefinition of 'i'
  for (unsigned int i = 0; i < m_row; ++i)
                    ^
prog.c:10:20: note: previous definition of 'i' was here
  for (unsigned int i = 0; i < m_row; ++i)
                    ^
prog.c:15:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
  for (unsigned int i = 0; i < m_row; ++i)
  ^

Standard output is empty