energy.c

#include <stdio.h>
#include <stdlib.h>

#define NROWS 10
#define NCOLS 7

float col_ave(int x[NROWS][NCOLS], int col) {
	float average;
	int i, total = 0;
	for (i = 0; i < NROWS; i++) {
		total += x[i][col];
	}
	average = total / (float)NROWS;
	
	return average;
}

int main() {

	// Collect data
	FILE *data = fopen("power1.dat", "r");

	int mo, tu, we, th, fr, sa, su;
	int temperature[NROWS][NCOLS];

	char *dataFormat = "%d %d %d %d %d %d %d";

	int i = 0;
	while (fscanf(data, dataFormat, &mo, &tu, &we, &th, &fr, &sa, &su) != -1) {
		temperature[i][0] = mo;
		temperature[i][1] = tu;
		temperature[i][2] = we;
		temperature[i][3] = th;
		temperature[i][4] = fr;
		temperature[i][5] = sa;
		temperature[i][6] = su;
		i++;
		//printf(dataFormat, mo, tu, we, th, fr, sa, su);
		//printf("\n");
	}

	fclose(data);
	data = NULL;

	// Interpret the data
	char *days[] = {
		"Monday",
		"Tuesday",
		"Wednesday",
		"Thursday",
		"Friday",
		"Saturday",
		"Sunday"
	};

	printf("Average energy use on:\n");
	for (i = 0; i < NCOLS; i++) {
		printf("%9s is %.2f MW\n", days[i], col_ave(temperature, i));
	}

	return 0;
}