 # C Programming Code Examples

## C > Arrays and Matrices Code Examples

### Check whether entered matrix is magic square or not ?

``` Check whether entered matrix is magic square or not ? A magic square is a simple mathematical game developed during the 1500. Square is divided into equal number of rows and columns. Start filling each square with the number from 1 to num ( where num = No of Rows X No of Columns ) You can only use a number once. Fill each square so that the sum of each row is the same as the sum of each column. In the example shown here, the sum of each row is 15, and the sum of each column is also 15. In this Example : The numbers from 1 through 9 is used only once. This is called a magic square. #include<stdio.h> #include<conio.h> int main() { int size = 3; int matrix; // = {{3,8,4},{5,8,7},{8,9,6}}; int row, column = 0; int sum, sum1, sum2; int flag = 0; printf("\nEnter matrix : "); for (row = 0; row < size; row++) { for (column = 0; column < size; column++) scanf("%d", &matrix[row][column]); } printf("Entered matrix is : \n"); for (row = 0; row < size; row++) { printf("\n"); for (column = 0; column < size; column++) { printf("\t%d", matrix[row][column]); } } //For diagonal elements sum = 0; for (row = 0; row < size; row++) { for (column = 0; column < size; column++) { if (row == column) sum = sum + matrix[row][column]; } } //For Rows for (row = 0; row < size; row++) { sum1 = 0; for (column = 0; column < size; column++) { sum1 = sum1 + matrix[row][column]; } if (sum == sum1) flag = 1; else { flag = 0; break; } } //For Columns for (row = 0; row < size; row++) { sum2 = 0; for (column = 0; column < size; column++) { sum2 = sum2 + matrix[column][row]; } if (sum == sum2) flag = 1; else { flag = 0; break; } } if (flag == 1) printf("\nMagic square"); else printf("\nNo Magic square"); return 0; } ``` 