# Write a program to find the sum of the diagonals of the given matrix

## Source Code

``` 1  #include<stdio.h>
2  #include<conio.h>
3  int main (int argc, char *argv[])
4  {
5    clrscr();
6    int m[10][10];
7    int i,j,n,sld=0,srd=0,sd=0,t=0;
8    for(i=0;i<10;i++)
9    {
10        for(j=0;j<10;j++)
11        {
12        m[i][j]=0;
13        }
14    }
15    printf("\n Enter size of a square matrix:");
16    scanf("%d",&n);
17    printf("\n Enter the two matrices: \n");
18    for(i=0;i<n;i++)
19    {
20        for(j=0;j<n;j++)
21        {
22      printf("Enter element %d %d of m1: ",(i+1),(j+1));
23      scanf("%d",&m[i][j]);
24        }
25    }
26    printf("\n The matrix is: \n");
27    for(i=0;i<n;i++)
28    {
29        for(j=0;j<n;j++)
30        {
31       printf("%d ",m[i][j]);
32        }
33        printf("\n");
34    }
35    for(i=0;i<n;i++)
36    {
37        sld+=m[i][i];
38        srd+=m[i][n-i-1];
39    }
40    if(n%2!=0)
41    {
42      t=n/2;
43      sd=sld+srd-m[t][t];
44    }
45    else
46      sd=sld+srd;
47    printf("\n The sum of diagonals of matrix are:\n %d : left diagonal\n %d : right diagonal\n %d : sum of the two diagonals",sld,srd,sd);
48    getch();
49  }
50  ```

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