#include<stdio.h>
int main()
{
int i,j,n,d1=0,d2=0,a[5][5];
printf("Enter size of square matrix:");
scanf("%d",&n);
printf("Enter Elements of matrix:\n");
for(i=0;i<n;++i)
for(j=0;j<n;++j)
{
scanf("%d",&a[i][j]);
if(i==j)
d1+=a[i][j];
if((i+j)==(n-1))
d2+=a[i][j];
}
printf("\nFirst Diagonal Sum=%d",d1);
printf("\nSecond Diagonal Sum=%d",d2);
return 0;
}
Output
Enter size of square matrix:4
Enter Elements of matrix:
1 2 3 4
5 6 7 8
9 10 11 12
10 7 6 8
First Diagonal Sum=26
Second Diagonal Sum=31