# C Program to check whether matrix is lower triangular matrix or not

*Find lower triangular matrix*

Write a C Program to check whether matrix is lower triangular matrix or not . Here’s simple program to print lower triangular matrix in C Programming Language. Write a C program to check lower triangular matrix.

*What is Matrix ?*

**Matrix representation** is a method used by a computer language to store matrices of more than one dimension in memory. C uses “Row Major”, which stores all the elements for a given row contiguously in memory.

*Two-dimensional Arrays : :*

The simplest form of multidimensional array is the two-dimensional array. A two-dimensional array is, in essence, a list of one-dimensional arrays. An m × n (read as m by n) order matrix is a set of numbers arranged in m rows and n columns.

To declare a two-dimensional integer array of size [x][y], you would write something as follows −

*type arrayName [ x ][ y ];*

Where **type** can be any valid C data type and **arrayName** will be a valid C identifier.

Below is the source code for C Program to check whether matrix is lower triangular matrix or not which is successfully compiled and run on Windows System to produce desired output as shown below :

**SOURCE CODE : :**

**SOURCE CODE : :**

/* C Program to check whether matrix is lower triangular matrix or not */ #include <stdio.h> int main() { int A[10][10],i,j,m,n; int row, col, isLower; printf("Enter no. of rows :: "); scanf("%d", &m); printf("\nEnter no. of cols :: "); scanf("%d",&n); printf("\nEnter values to the matrix :: \n"); for (i = 0; i < m; i++) { for (j = 0; j < n; j++) { printf("\nEnter a[%d][%d] value :: ",i,j); scanf("%d", &A[i][j]); } } isLower = 1; for(row=0; row<m; row++) { for(col=0; col<n; col++) { /* * If elements above main diagonal(col>row) * is not equal to zero(A[row][col]!=0) */ if(col>row && A[row][col]!=0) { isLower = 0; } } } if(isLower == 1) { printf("\nMatrix is Lower triangular matrix: \n\n"); /* * Prints elements of lower triangular matrix */ for(row=0; row<m; row++) { for(col=0; col<n; col++) { if(A[row][col]!=0) { printf("\t%d", A[row][col]); } } printf("\n\n"); } } else { printf("\nMatrix is not a Lower triangular matrix"); } return 0; }

**Output : :**

**Output : :**

/* C Program to check whether matrix is lower triangular matrix or not */ Enter no. of rows :: 3 Enter no. of cols :: 3 Enter values to the matrix :: Enter a[0][0] value :: 1 Enter a[0][1] value :: 0 Enter a[0][2] value :: 0 Enter a[1][0] value :: 2 Enter a[1][1] value :: 3 Enter a[1][2] value :: 0 Enter a[2][0] value :: 4 Enter a[2][1] value :: 5 Enter a[2][2] value :: 6 Matrix is Lower triangular matrix: 1 2 3 4 5 6 Process returned 0

Above is the source code for C Program to check whether matrix is lower triangular matrix or not which is successfully compiled and run on Windows System.The Output of the program is shown above .

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