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#include <stdio.h>
 
#define ROWCOL_MULTIPLIER 50
 
int main() {
	size_t loop, i, j;
 
	for (loop = 0; loop < 11; loop++) {
		const double val = loop * ROWCOL_MULTIPLIER;
		double *column_sum = malloc(sizeof(double) * val * val);
		double *p = malloc(val * val * sizeof *p);
 
		// do foo things
 
		for (i = 0; i < val; i++) {
			column_sum[i] = 0;
			for (j = 0; j < val; j++) {
				column_sum[i] += p[j][i];
			}
		}
 
		free(p);
		free(column_sum);
	}
	return 0;
}

prog.c: In function ‘main’:
prog.c:10:3: warning: implicit declaration of function ‘malloc’ [-Wimplicit-function-declaration]
   double *column_sum = malloc(sizeof(double) * val * val);
   ^
prog.c:10:24: warning: incompatible implicit declaration of built-in function ‘malloc’ [enabled by default]
   double *column_sum = malloc(sizeof(double) * val * val);
                        ^
prog.c:18:25: error: subscripted value is neither array nor pointer nor vector
     column_sum[i] = p[j][i];
                         ^
prog.c:22:3: warning: implicit declaration of function ‘free’ [-Wimplicit-function-declaration]
   free(p);
   ^
prog.c:22:3: warning: incompatible implicit declaration of built-in function ‘free’ [enabled by default]

Standard output is empty