*C++ Program to Find Sum of Main Diagonal Matrix*

Write a C++ Program to Find Sum Above and Below of Main Diagonal Matrix. Here’s simple Program to Find Sum Above and Below of Main Diagonal Matrix in C Programming Language.

*Definition Of Main Diagonal : :*

Main Diagonal of a matrix consists of the elements of a square from the upper left element proceeding to the down right element diagonally.

*More About Main Diagonal :*

*More About Main Diagonal :*

**Examples of Main Diagonal :**

**Examples of Main Diagonal :**

*The elements 1, 5, and 9 are the elements of the main diagonal of a 3 × 3 matrix.*

Below is the source code for C++ Program to Find Sum Above and Below of Main Diagonal Matrix which is successfully compiled and run on Windows System to produce desired output as shown below :

**SOURCE CODE : :**

**SOURCE CODE : :**

/* C++ Program to Find Sum Above and Below of Main Diagonal Matrix */ #include<iostream> using namespace std; int main() { int arr[5][5],a=0,b=0,i,j,n; cout<<"Enter size of matrix(max 5):"; cin>>n; cout<<"Enter the matrix:\n"; for(i=0;i<n;++i) for(j=0;j<n;++j) cin>>arr[i][j]; for(i=0;i<n;++i) for(j=0;j<n;++j) if(j>i) a+=arr[i][j]; else if(i>j) b+=arr[i][j]; cout<<"\nSum of elements above the diagonal:"<<a; cout<<"\nSum of elements below the diagonal:"<<b; return 0; }

*OUTPUT : :*

*************OUTPUT***************** /* C++ Program to Find Sum Above and Below of Main Diagonal Matrix */ Enter size of matrix(max 5):3 Enter the matrix: 1 2 3 4 5 6 7 8 9 Sum of elements above the diagonal:11 Sum of elements below the diagonal:19

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