16. Write a program to check if the given matrix is magic square or not.

/* check the matrix is magic square */

#include <stdio.h>

#include <conio.h> void main()

{

int a[10][10],i=0,j=0,m ,n,sum=0,sum1=0,tempsum1=0,tempsum=0; clrscr();

printf("\n Enter the order of matrix mxn \n "); scanf("%d%d",&m,&n);

if(m!=n)

{

printf(" is not possible\n"); getch();

}

else

{

printf("Enter values of matrix \n"); for(i=0;i<m;i++)

{

for(j=0;j<n;j++) scanf("%d",&a[i][j]);

}

if(m==n)

{ i=0;

while(i<m)

{

sum=0; sum1=0; for(j=0;j<n;j++)

{

sum+=a[i][j];

sum1+=a[j][i];

}

printf("Row%d sum is:%d\n",i+1,sum); printf("Col%d sum is:%d\n",i+1,sum1); if(sum !=sum1)

{

printf("Not a Magic square\n"); getch();

exit();

}

if((i!=0 && sum!=tempsum) || (i!=0 && sum1 !=tempsum1))

{

printf("Not a Magic square1\n"); getch();

exit();

}

else i=i+1;

tempsum=sum; tempsum1=sum1;

}

//check for diagonal sum sum=0;

sum1=0; for(i=0;i<m;i++) sum+=a[i][i]; i=0;

for(j=m-1;j>=0;j--)

{

sum1+=a[i++][j];

}

printf("sum=%d,sum1=%d",sum,sum1); if(sum!=sum1)

{

printf("Not a Magic square3\n"); getch();

exit();

}

}

printf("Magic Square\n"); getch();

}

} // end