C++ program to show sum of main diagonal elements by using nested for loop.
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#include<iostream> using namespace std; int main() { int size=3; int a[size][size]; int row,col,sum=0; cout<<"enter elements in matrix of size:"<<size<<"*"<<size<<endl; for(row=0;row<size;row++) { for(col=0;col<size;col++) { cin>>a[row][col]; } } for(row=0;row<size;row++) { sum=sum+a[row][row]; } cout<<"sum of main diagonal elements:"<<sum; } |
Let’s see the declaration flow table of the given program.
| Variables and arrays | Declaration | Initialization | Use line number |
| a[size][size] | 6 | 13 | 18 |
| row | 7 | 9A|9C|16A|16C | 9B|16B |
| col | 7 | 11A|11C | 11B |
| sum | 7 | 7|18 | 20 |
| size | 5 | 5 | 8|9B|11B|16B |
Output
