Dec 14, 2011 at 5:58am
uhu ! ... another beginer here !
What I'm doing wrong ?
Using this combination of c1, r1, c2, r2, it's stops on line 36
Normally, should work for any combination
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#include<string.h>
#include<stdio.h>
#include<stdlib.h>
#include<ctype.h>
int main() // Define matrix as an array of pointers
{
int** xyz;
int r1=3, c1=2 , r2=2 , c2=3 ;
int i, j;
// Allocate the columns
xyz = (int**)calloc(c1, sizeof(int*));
// Allocate the rows
for (i = 0; i < r1; i++)
xyz[i] = (int*)calloc(r1, sizeof(int));
// Initialize the element(s)
for(i = 0; i < r1; i++)
for(j = 0; j < c1; j++)
xyz[i][j] = (i*j+i*i);
// Display whole matrix
for(i = 0; i < r1; i++)
{
putchar('\n');
for(j = 0; j < c1; j++)
printf("%i\t", xyz[i][j]);
}
// Increase number of row(s) and column(s)
putchar('\n');
// Reallocate columns
xyz = (int**)realloc(xyz, (c1 + c2)*sizeof(int*));
// The new column's pointer must be initialised to NULL
for(i = c1; i < (c1 + c2); i++)
xyz[i] = NULL;
// Reallocate rows
for (i = r1; i < (r1 + r2); i++)
xyz[i] = (int*)realloc(xyz[i], (r1 + r2)*sizeof(int));
// Display whole matrix
for(i = 0; i < (r1 + r2); i++)
{
putchar('\n');
for(j = 0; j < (c1 + c2); j++)
printf("%d\t", xyz[i][j]);
}
// Deallocate the rows
for (i = r1 ; i < (r1 + r2) ; ++i)
free(xyz[i]);
// Deallocate the columns
free(xyz);
return(0);
}
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thank you !
Last edited on Dec 14, 2011 at 6:19am
Dec 14, 2011 at 11:57am
you mistake c and r.
On line 13 you allocate enough space for c1, but on line 16 you initialize it with r1. All other loops follow the same mistake
Dec 17, 2011 at 4:52am
yep, thank you for your help !
