﻿ C Program: Display the lower triangular of a given matrix - w3resource

# C Exercises: Display the lower triangular of a given matrix

## C Array: Exercise-26 with Solution

Write a program in C to print or display the lower triangular of a given matrix.

Visual Presentation:

Sample Solution:

C Code:

``````#include <stdio.h>

int main() {
int arr1[10][10], i, j, n;
float determinant = 0;

// Display the purpose of the program
printf("\n\nDisplay the lower triangular of a given matrix :\n");
printf("----------------------------------------------------\n");

// Input the size of the square matrix
printf("Input the size of the square matrix : ");
scanf("%d", &n);

// Input elements into the matrix
printf("Input elements in the matrix :\n");
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++) {
printf("element - [%d],[%d] : ", i, j);
scanf("%d", &arr1[i][j]);
}
}

// Display the original matrix
printf("The matrix is :\n");
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++) {
printf("% 4d", arr1[i][j]);
}
printf("\n");
}

// Display lower triangular matrix by setting upper triangular elements to zero
printf("\nSetting zero in lower triangular matrix\n");
for (i = 0; i < n; i++) {
printf("\n");
for (j = 0; j < n; j++) {
if (i <= j) {
printf("% 4d", arr1[i][j]); // Print the original elements if i <= j (lower triangular)
} else {
printf("% 4d", 0); // Print zero if i > j (upper triangular)
}
}
}
printf("\n\n");

return 0;
}
```
```

Sample Output:

```Display the lower triangular of a given matrix :
----------------------------------------------------
Input the size of the square matrix : 3
Input elements in the first matrix :
element - [0],[0] : 1
element - [0],[1] : 2
element - [0],[2] : 3
element - [1],[0] : 4
element - [1],[1] : 5
element - [1],[2] : 6
element - [2],[0] : 7
element - [2],[1] : 8
element - [2],[2] : 9
The matrix is :
1   2   3
4   5   6
7   8   9
Setting zero in lower triangular matrix

1   2   3
0   5   6
0   0   9
```

Flowchart:

C Programming Code Editor:

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