59. WRITE A C PROGRAM TO PRINT UPPER AND LOWER TRIANGLE OF A MATRIX

/*C program to print upper and lower triangle of a matrix*/

#include <stdio.h>
#include <stdlib.h>
int main() {
int **data, i, j, n;
/* Enter the order of the input matrix */
printf("Enter the order of matrix:\n");
scanf("%d", &n);
/* dynamically allocate memory to store matrix elements */
data = (int **)malloc(sizeof (int) * n);
for (i = 0; i < n; i++)
data[i] = (int *)malloc(sizeof (int) * n);
/* get the inputs from the user */
printf("Enter your inputs:\n");
for (i = 0; i < n; i++)
for (j = 0; j < n; j++)
scanf("%d", &data[i][j]);
/* print the upper triangular matrix */
printf("Upper triangular matrix:\n");
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++)
if (j >= i)
printf("%3d", data[i][j]);
else
printf("%3d", 0);
printf("\n");
}
/* print the lower triangular matrix */
printf("Lower triangular matrix:\n");
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++)
if (j <= i)
printf("%3d", data[i][j]);
else
printf("%3d", 0);
printf("\n");
}
return 0;
}

output

Enter the order of matrix:
 3

Enter your inputs:
 10 20 30
 40 50 60
 70 80 90

Upper triangular matrix:
 10 20  30
 0   50  60
 0    0   90

Lower triangular matrix:
 10  0   0
 40 50  0
 70 80 90