Thread: Getting an error when totaling table

I am a novice to C programming, and a program I am writing for school is crashing when attempting to total all values in table, and I cannot figure out what I am doing wrong in the void Totals(void) function. Any suggestions would be great.

Code:

/* The name of this program is Week 4 Classroom */

/* This program prints out sales information, number of sales persons, products sold, and amount of money */

#include <stdio.h>

/* Preload array with values */
int sales[7][6] = {{0, 1, 2, 3, 4}, {1}, {2}, {3}, {4}, {5}};
 

/* Define Functions */

/* print out blank table */
void print_table(void)
{
	int r, c; /* r = row and c = column */

	for(r = 0; r < 7; ++r)
	{
		for(c = 0; c < 6; ++c)

			printf("%5i", sales[r][c]); /* %5i makes column 5 characters wide */
		printf("\n");
	}
}


/* zeros out the table */
void zero_table(void)
{
	int r, c; /* r = row and c = column */

	for(r = 1; r < 7; ++r)
	{
		for(c = 1; c < 6; ++c)

			sales[r][c] = 0; /* all values set to zero */
	}
}


int get_information(int number, int low, int high) /* number is salesperson or product number */
{
	int a;

	do
	{

		printf("Enter");

	switch(number) /* no semi colon after switch statement */
	{
	case 1: printf("Salesperson");
			break;
	
	case 2: printf("Product");
			break;

	case 3: printf("Amount");
			break;
	}

	scanf("%i", &a);

	if(a < low || a > high)
		printf("Invalid entry... please try again \n");
	}
	while(a < low || a > high);

	return(a);
}



void enter_all_daily_sales(void)
{
	int done;
	int salesperson;
	int product;
	int amount;

	do
	{
		salesperson = get_information (1, 1, 4);
		product = get_information (2, 1, 5);
		amount = get_information (3, 0, 9999999);

		sales[product][salesperson] = sales[product][salesperson] + amount;

			printf("Are you done? 1 = Yes 0 = No \n");
			scanf("%i", &done);
	}
		while(! done);
}



void totals(void)
{
	int c;  /* c = columns */
	int rows;

	for(rows = 1; c < 6; ++rows)

		for(c = 1; c < 5; ++c)

			sales[rows][5] = sales[rows][5] + sales[rows][c];

		for(c = 1; c < 5; ++c)

			for(rows = 1; rows < 6; ++rows);

			sales[6][c] = sales[6][c] + sales[6][rows];
}

/* Declare Global Variables */



int main(void)
{
	print_table();
	printf("\n\n\n\n");
	zero_table();
	print_table();
	printf("\n\n\n\n");
	enter_all_daily_sales();
	print_table();
	printf("\n\n\n\n");
	totals();
	print_table();

	printf("\n\n\n\n");
	
}

I still don't understand what the first reply means. Please remember I am a novice, additional explanations and or suggestions welcomed

My program creates a table, and then totals the values in the tables

A salesperson sold 4 of product 1, 1 of product 2, 2 of product 3, 0 of product 4, and total sales is 4000

The program allows user to manually enter the salesperson number, the quanity of product # sold, and the daily sales total until all data is entered

Program should provide a total of all rows in column 6, and totals for each column in row 7 of the table, and the totaling is where my program generates an error

salesperson 1 2 3 4 total sales
product 1 4 1 2 0 4000
product 2 1
product 3 2
product 4 0
product 5 0
total total total total