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Commit b773f28e authored by Florian Gerstmayer's avatar Florian Gerstmayer
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Update Task 2.9, more compact solution

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ch_2/task_09/main.c
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......@@ -3,121 +3,109 @@
* BASIC EXERCISES - EXAMPLE SOLUTIONS *
* *
* Task_2.09: Magic Square *
* Author: Dominik Widhalm *
* Email: dominik.widhalm@technikum-wien.at *
* Date: 2017-05-08 *
* Author: Florian Gerstmayer *
* Email: florian.gerstmayer@technikum-wien.at *
* Date: 2017-10-24 *
* *
******************************************************************************/
/***** INCLUDES ***************************************************************/
#include <stdio.h>
/***** MACROS *****************************************************************/
/***** TYPEDEFS ***************************************************************/
/***** STRUCTURES *************************************************************/
/***** GLOBAL VARIABLES *******************************************************/
/*********DEFINES**************************************************************/
//xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx//
#define SIZE 3
/***** FUNCTION PROTOTYPES ****************************************************/
/***** LOCAL FUNCTIONS ********************************************************/
/*********INCLUDES*************************************************************/
//xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx//
#include <stdio.h>
/***** MAIN ROUTINE ***********************************************************/
/*********MAIN*****************************************************************/
//xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxcxx//
int main (void) {
/*** Local Variables ***/
int magic=1;
int sum=0;
int temp=0;
int values[5][5];
int quadrat[SIZE][SIZE] = {0};
int magic = 1;
int row = 0;
int col = 0;
int sum = 0;
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<5; i++) {
/* Ask the user the enter the numbers of the i. row */
printf("Please enter the numbers of the %d. row:\n",(i+1));
for (int j=0; j<5; j++) {
/* ask the user to enter the numbers */
printf("Enter the %d. number: ",(j+1));
/* Read in the user's input */
scanf("%d",&values[i][j]);
for (int i = 0; i < SIZE; i++) {
for (int j = 0; j < SIZE; j++) {
printf("Please enter a number for row %d, col %d: ", i+1, j+1);
scanf("%d", &quadrat[i][j]);
}
}
printf("\n\n\n");
/* Get the sum of the first row */
for (int i=0; i<5; i++) {
sum += values[0][i];
}
/* Check the sums of all rows */
for (int i=1; i<5; i++) {
/* Calculate the sum of the i. row (1. already calculated) */
temp = 0;
for (int j=0; j<5; j++) {
temp += values[i][j];
}
/* Compare the sums */
if (sum != temp) {
/* No magical square */
magic = 0;
/* Print square to user */
for (int i = 0; i < SIZE; i++) {
for (int j = 0; j < SIZE; j++) {
printf(" %d ", quadrat[i][j]);
}
printf("\n");
}
/* Check the sums of all columns */
for (int i=0; i<5; i++) {
/* Calculate the sum of the i. row */
temp = 0;
for (int j=0; j<5; j++) {
temp += values[j][i];
/* Get the sum of the first row */
sum = 0;
for (int j = 0; j < SIZE; j++) {
sum += quadrat[0][j];
}
/* Check the sums of all rows, columns and diagonals */
for (int i = 0; i < SIZE; i++) {
row = 0;
col = 0;
/* 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) */
if (i == (SIZE-j-1)) {
dia2 += quadrat[j][i]; // [0][2], [1][1], [2][0],...
}
}
/* Compare the sums */
if (sum != temp) {
/* No magical square */
/* If any sum (row or col) inequal to reference value */
if (sum != row || sum != col) {
/* no magic square */
magic = 0;
break;
}
}
/* Check the sums of the first diagonal */
temp = 0;
for (int i=0; i<5; i++) {
temp += values[i][i];
}
/* Compare the sums */
if (sum != temp) {
/* No magical square */
magic = 0;
}
/* Check the sums of the second diagonal */
temp = 0;
for (int i=0; i<5; i++) {
temp += values[i][4-i];
}
/* Compare the sums */
if (sum != temp) {
/* No magical square */
magic = 0;
}
/* Check if square is actually a magic square */
if (magic == 1) {
/* The square is a magic square */
printf("\nThe square is a magic square!\n\n");
/* If also the diagonals match the reference value -> "full" magic */
if (dia1 == sum && dia2 == sum) {
printf("Magic Square!\n");
} else {
/* Otherwise, semi magical */
printf("Semi-magic square!\n");
}
} else {
/* The square is not a magic square */
printf("\nThe square is NOT a magic square!\n\n");
printf("Nope, no magic square!\n");
}
/* Notify the user about the termination of the program */
printf("The program will now be terminated...\n");
return 0; /* Return with Success (0) */
return 0;
}
/******************************************************************************/
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