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POAccess violation reading location in dimensional matrix
 

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  1. POAccess violation reading location in dimensional matrix
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    <p>I would like to get your help to understand and finish my program.</p> <p>This is what I have to do:</p> <blockquote> <p>"You must exercise program that: First. An absorbing two - dimensional integer arr [M] [N]. M - number of rows N - number of columns. (Matrix size was received from the user) Two. The program uses auxiliary functions "shift" moves the values ​​of the matrix to the right one place, as shown in the picture (2 entered instead of 1, 3 instead of 2, 4 instead of 3, ... 20 instead of 19, first place 20). Shift have to write a function and call her three times in the sample matrix loop .."</p> </blockquote> <p>Example picture: <img src="https://i.stack.imgur.com/i4So6.jpg" alt="enter image description here"></p> <p>error msg: <img src="https://i.stack.imgur.com/x8uiX.jpg" alt="enter image description here"></p> <p>After trying to solve the problem i gave up, i would like to get your help to understand what is wrong in my code. Is it about the memory? This is my code:</p> <pre><code>#include "stdio.h" #include "conio.h" #include "stdlib.h" #include "malloc.h" void shift (int **arr,int rows,int cols); void freemalloc ( int **arr,int rows); void main() { int **arr,cols,rows; int i,j; printf("please insert rows and columns of the matrix: "); scanf_s("%d%d",&amp;rows,&amp;cols); arr=(int **)malloc(rows*sizeof(int *)); for(i=0; i&lt;rows; i++) arr[i]=(int *)malloc(cols*sizeof(int)); for (i=0; i&lt;rows; i++) for (j=0; j&lt;cols; j++) { printf("rows %d , cols %d :\n", i, j); scanf_s("%d", &amp;arr[i][j]); } shift (arr,rows,cols); freemalloc (arr,rows); system("pause"); return ; } void shift (int **arr,int rows,int cols) { int i,j,temp=0; for(i=0; i&lt;rows ; i++ ) for( j=0 ; j&lt;cols ; j++); { temp=arr[i][j]; arr[i][j]=arr[i][cols-1]; arr[i][cols-1]=temp; } for(i=0; i&lt;rows ; i++) { for(j=0; j&lt;cols ; j++) { printf("%d ",arr[i][j]); } printf("\n"); } } void freemalloc ( int **arr,int rows) { int i; for (i=0 ; i&lt;rows ; i++) { free(arr[i]); } free(arr); } </code></pre>
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    1. USVoronoiPotato
    1. USSagi Binder
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    1. COIf you include standard header files, like `stdio.h` use `<stdio.h>` instead. Also, you should not cast the return value of functions returning `void *`, like `malloc`.
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      1. USSome programmer dude
    2. COAs for your problem, run the program in a debugger, it will stop at the location of the crash, and you can then examine the function call stack and local variables and arguments.
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      1. USSome programmer dude
    3. COYou will want some type of delimiter when reading the values, otherwise scanf won't be able to tell them apart and you will likely end up using an uninitialized `cols` value: `scanf_s("%d %d",&rows,&cols);`
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      1. USjosh poley
 

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