Example:
If the array elements are:
1 2 3
4 5 6
7 8 9
Output: Sum of main diagonal elements = 15
Required knowledge:
Basic C programming, For loop, Array, MatrixMain diagonal of matrix
Main diagonal of a matrix A is a collection of elements Aij Such that i = j.Program:
/** * C program to find sum of main 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 main diagonal elements */ for(row=0; row<3; row++) { sum = sum + A[row][row]; } printf("\nSum of main 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 main diagonal elements = 15
1 2 3
4 5 6
7 8 9
Sum of main diagonal elements = 15
Happy coding ;)
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