Skip to content

GitLab

Commit 9e27c52d authored by Dominik Widhalm's avatar Dominik Widhalm
Browse files

Some beautifications and adaptions to fit coding style for task 2.09

parent 4e7a8178
Hide whitespace changes
Inline Side-by-side
ch_2/task_09/main.c
View file @ 9e27c52d
......@@ -3,27 +3,39 @@
* BASIC EXERCISES - EXAMPLE SOLUTIONS *
* *
* Task_2.09: Magic Square *
* Author: Florian Gerstmayer *
* Author: Florian Gerstmayer / Dominik Widhalm *
* Email: florian.gerstmayer@technikum-wien.at *
* Email: dominik.widhalm@technikum-wien.at *
* Date: 2017-10-24 *
* *
* Notes: *
* *) Quadrat-Indizes: *
* [0][0] [0][1] [0][2] ... *
* [1][0] [1][1] [1][2] ... *
* [2][0] [2][1] [2][2] ... *
* ... ... ... *
* *) Examples for magic squares: *
* https://en.wikipedia.org/wiki/Magic_square *
* *) Examples for 3x3 semi magic squares: *
* http://mathworld.wolfram.com/SemimagicSquare.html *
* *
******************************************************************************/
/*********DEFINES**************************************************************/
//xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx//
#define SIZE 3
/***** INCLUDES ***************************************************************/
#include <stdio.h>
/*********INCLUDES*************************************************************/
//xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx//
#include <stdio.h>
/***** MACROS *****************************************************************/
// Size of the square (SIZE x SIZE)
#define SIZE 4
// (Optional) Enable additional debug output
#define DBG 0
/*********MAIN*****************************************************************/
//xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxcxx//
/***** MAIN ROUTINE ***********************************************************/
int main (void) {
/*** Local Variables ***/
int quadrat[SIZE][SIZE] = {0};
int magic = 1;
int row = 0;
......@@ -32,83 +44,88 @@ int main (void) {
int dia1 = 0;
int dia2 = 0;
/*
Quadrat-Indizes:
[0][0] [0][1] [0][2] ...
[1][0] [1][1] [1][2] ...
[2][0] [2][1] [2][2] ...
... ... ...
*/
/* Read in the numbers of the square */
for (int i = 0; i < SIZE; i++) {
for (int j = 0; j < SIZE; j++) {
/* Ask the user the enter the number of the i. row and j. column */
printf("Please enter a number for row %d, col %d: ", i+1, j+1);
/* Read in the user's input and check for validity */
if (scanf("%d", &quadrat[i][j]) != 1) {
printf("Illegal character entered, exiting.\n");
/* The user's input was not a valid number */
printf("Illegal character entered!.\n\n");
printf("The program will now be terminated...\n");
/* Return with "FAIL" */
return 1;
}
}
}
printf("\n\n\n");
/* Print square to user */
/* Print the user entered square */
printf("\nEntered Square:\n");
for (int i = 0; i < SIZE; i++) {
for (int j = 0; j < SIZE; j++) {
printf(" %d ", quadrat[i][j]);
printf("%3d ", quadrat[i][j]);
}
printf("\n");
}
/* Get the sum of the first row */
sum = 0;
/* First get the reference sum (from the first row) */
for (int j = 0; j < SIZE; j++) {
/* Sum up the numbers */
sum += quadrat[0][j];
}
/* (Optional) Output the reference sum */
if (DBG) printf("\nThe reference sum is %d\n",sum);
/* Check the sums of all rows, columns and diagonals */
for (int i = 0; i < SIZE; i++) {
row = 0;
col = 0;
/* sum up */
/* Sum up ... */
for (int j = 0; j < SIZE; j++) {
/* all rows */
row += quadrat[i][j]; // [0][0], [0][1], [0][2],...
/* all columns */
/* Notice the switch of indices! */
col += quadrat[j][i]; // [0][0], [1][0], [2][0],...
/* diagonale 1, top left to bottom right (same indices) */
if (i == j)
dia1 += quadrat[j][i]; // [0][0], [1][1], [2][2],...
/* diagonale 2, top right to bottom left (inverted indices for 2) */
/* ... all rows: [0][0], [0][1], [0][2], ... */
row += quadrat[i][j];
/* ... all columns: [0][0], [1][0], [2][0], ... */
col += quadrat[j][i]; // Notice the switch of indices!
/* ... diagonale 1: [0][0], [1][1], [2][2], ... */
if (i == j) {
dia1 += quadrat[j][i]; // Same indices!
}
/* ... diagonale 2: [0][2], [1][1], [2][0], ... */
if (i == (SIZE-j-1)) {
dia2 += quadrat[j][i]; // [0][2], [1][1], [2][0],...
dia2 += quadrat[j][i]; // Inverted indices!
}
}
/* If any sum (row or col) inequal to reference value */
if (sum != row || sum != col) {
/* no magic square */
/* If any of the row or column sum differs ... */
if ((sum != row) || (sum != col)) {
/* ... it is not a magic square */
magic = 0;
/* No need to continue checking */
break;
}
}
/* Check if sums of rows and columns were equal */
if (magic == 1) {
/* If also the diagonals match the reference value -> "full" magic */
if (dia1 == sum && dia2 == sum) {
printf("Magic Square!\n");
if ((dia1 == sum) && (dia2 == sum)) {
/* The square is a full magic square */
printf("\nThe square is a FULL magic square!\n\n");
} else {
/* Otherwise, semi magical */
printf("Semi-magic square!\n");
/* The square is a aemi magic square */
printf("\nThe square is a SEMI magic square!\n\n");
}
} else {
printf("Nope, no magic square!\n");
/* The square is not a magic square */
printf("\nThe square is NOT a magic square!\n\n");
}
return 0;
/* Notify the user about the termination of the program */
printf("The program will now be terminated...\n");
return 0; /* Return with Success (0) */
}
/******************************************************************************/
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment