Answer:
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Explanation:
//program to check if the entered grid is magic square or not
/**c++ standard libraries
*/
#include<bits/stdc++.h>
using namespace std;
/**function to check whether the entered grid is magic square or not
*/
int isMagicSquare(int arr[3][3]){
   int i,j,sum=0,sum1=0,rsum,csum;
   for(i=0;i<3;i++){
       sum+=arr[i][i];
       sum1+=arr[i][2-i];
   }
   if(sum!=sum1){
       return 0;
   }
  
   for(i=0;i<3;i++){
       rsum=0;
       csum=0;
       for(j=0;j<3;j++){
           rsum+=arr[i][j];
           csum+=arr[j][i];
       }
       if(sum!=rsum){
           return 0;
       }
       if(sum!=csum){
           return 0;
       }
   }
   return 1;
}
/** main function to get user entries and
* call function
* and print output
*/
int main(){
   int i,j,arr[3][3]={0};
   for(i=0;i<3;i++){
       for(j=0;j<3;j++){
           cout<<"Enter the number for row "<<i<<" and column "<<j<<" : ";
           cin>>arr[i][j];
       }
   }
   int ret = isMagicSquare(arr);
   if(ret==1){
       cout<<"This is a Lo Shu magic square"<<endl;
   }
   else{
       cout<<"This is not a Lo Shu magic square"<<endl;
   }
   return 0;
}