### Program 135:To find Sum of all Diagonals in a matrix

Program 135:
Method I
```#include<stdio.h>
main()
{
int i,j,rows,col,diagonal_1=0,diagonal_2=0,m,n;
printf("Enter number of rows\n");
scanf("%d %d",&rows,&col);

int a[rows][col];
if(col==rows)
{
m=0;
n=rows-1;
//Taking input for matrix
printf("Enter Matrix 1\n");
for(i=0;i<rows;i++)
{
for(j=0;j<col;j++)
{
scanf("%d",&a[i][j]);
}
}
printf("The given Matrix is\n");
for(i=0;i<rows;i++)
{
for(j=0;j<col;j++)
{
printf("%d\t",a[i][j]);
}
printf("\n");
}

for(i=0;i<rows;i++)
{
diagonal_1+=a[i][i];
diagonal_2+=a[m][n];
m++;
n--;
}
printf("Sum of diagonal is %d\n",diagonal_1);
printf("Sum of another diagonal is %d\n",diagonal_2);
}
else
{
printf("Not Possible\n");
}

}

```
Method II

```#include<stdio.h>
main()
{
int i,j,rows,col,diagonal_1=0,diagonal_2=0;
printf("Enter number of rows\n");
scanf("%d %d",&rows,&col);

int a[rows][col];
if(col==rows)
{
//Taking input for matrix
printf("Enter Matrix 1\n");
for(i=0;i<rows;i++)
{
for(j=0;j<col;j++)
{
scanf("%d",&a[i][j]);
}
}
printf("The given Matrix is\n");
for(i=0;i<rows;i++)
{
for(j=0;j<col;j++)
{
printf("%d\t",a[i][j]);
}
printf("\n");
}

for(i=0;i<rows;i++)
{
diagonal_1+=a[i][i];
diagonal_2+=a[i][rows-i-1];

}
printf("Sum of diagonal is %d\n",diagonal_1);
printf("Sum of another diagonal is %d\n",diagonal_2);
}
else
{
printf("Not Possible\n");
}

}

```
Explanation:

//Coming Soon...

Output:

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