Write a C program to read elements in a matrix and find the sum of minor diagonal (opposite diagonal) elements. C program to calculate sum of minor diagonal elements.

If the matrix elements are:

1 2 3

4 5 6

7 8 9

Sum of minor diagonal elements = 15

Happy coding ;)

**Example:**If the matrix elements are:

1 2 3

4 5 6

7 8 9

Sum of minor diagonal elements = 15

### Required knowledge:

Basic C programming, For loop, Array, Matrix#### Minor diagonal of a matrix

Minor diagonal of a matrix**A**is a collection of elements**A**_{ij}Such that*i + j = N + 1*.### Program:

/** * C program to find sum of opposite diagonal elements of a matrix */ #include <stdio.h> int main() { int A[3][3]; int row, col, sum = 0; /* * Reads elements in matrix from user */ printf("Enter elements in matrix of size 3x3: \n"); for(row=0; row<3; row++) { for(col=0; col<3; col++) { scanf("%d", &A[row][col]); } } /* * Finds the sum of minor diagonal elements */ for(row=0; row<3; row++) { for(col=0; col<3; col++) { /* * If it is minor diagonal of matrix * Minor diagonal: i+j == N + 1 * Since array elements starts from 0 hence i+j == (N + 1)-2 */ if(row+col == ((3+1)-2)) { sum += A[row][col]; } } } printf("\nSum of minor diagonal elements = %d", sum); return 0; }

Output

Enter elements in matrix of size 3x3:

1 2 3

4 5 6

7 8 9

Sum of minor elements = 15

1 2 3

4 5 6

7 8 9

Sum of minor elements = 15

Happy coding ;)

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