Odd results on user input array
More of less on a whim I decided to write a program to convert matrices into row echelon form. To start off, I wrote a program that took numbers from the user and wrote them into a matrix, then display that matrix.
Code:
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
int c;
int i, j;
int nr_row, nr_column;
float mat[nr_row][nr_column];
printf("Number of rows: ");
scanf(" %i", &nr_row);
printf("\nNumber of columns: ");
scanf(" %i", &nr_column);
printf("\nInput matrix elements:");
for (i = 0; i < nr_row; i++){
for (j = 0; j < nr_column; j++)
{
printf("\nInput element [%d][%d]: ", i, j);
scanf("%f", &mat[i][j]);
}
}
printf("===========================================");
printf("\nMatrix entered-\n");
for (i = 0; i < nr_row; i++)
{
printf("\n");
for (j = 0; j < nr_column; j++)
{
printf("%7.2f", mat[i][j]);
}
}
return 0;
}
However, somewhere along the line the values are changed somehow-
Code:
Number of rows: 4
Number of columns: 2
Input matrix elements:
Input element [0][0]: 1
Input element [0][1]: 5
Input element [1][0]: 54
Input element [1][1]: 88
Input element [2][0]: 12
Input element [2][1]: 48
Input element [3][0]: 13
Input element [3][1]: 52
===========================================
Matrix entered-
1.00 54.00
54.00 12.00
12.00 13.00
13.00 52.00
Another run-
Code:
Number of rows: 3
Number of columns: 3
Input matrix elements:
Input element [0][0]: 1
Input element [0][1]: 8
Input element [0][2]: 4
Input element [1][0]: 56
Input element [1][1]: 12
Input element [1][2]: 3
Input element [2][0]: 45
Input element [2][1]: 78
Input element [2][2]: 9
===========================================
Matrix entered-
1.00 56.00 45.00
56.00 45.00 78.00
45.00 78.00 9.00
