C program to print lower triangular matrix

C program to print lower triangular matrix

Output:

Enter the elements of the matrix:
1 0 0
2 3 0
4 5 6
The entered matrix is Lower triangular matrix

Implementation:

#include <stdio.h> #define r 3 //change the row size here #define c 3 //change the column size here enum bool{false,true}; int main(void) { int a[r][c]; int i,j; enum bool flag=false; printf("Enter the elements of the matrix:\n"); for(i=0;i<r;i++) { for(j=0;j<c;j++) { scanf("%d",&a[i][j]); } } /* checking whether it is lower triangular matrix i.e., If all the elements above the main diagonal are zero, then it is said to be lower triangular matrix example: 1 0 0 2 3 0 4 5 6 the main diagonal is 1 3 6, & as you can see, all the elements above the main diagonal are zero. Now, how to check whether a given matrix is lower triangular matrix For that, we can take the pattern in the row & column indices that, for all the elements above the main diagonal, column index > row index for all the elements below the main diagonal, row index > column index for all the elements in the main diagonal, row index = column index */ for(i=0;i<r;i++) { for(j=0;j<c;j++) { if(j>i) { if(a[i][j]!=0) { flag=true; break; } } } if(flag) break; } if(flag) printf("The entered matrix is Not a Lower triangular matrix\n"); else printf("The entered matrix is Lower triangular matrix\n"); return 0; }