Segmentation fault (core dumped) codelite ubuntu

Question

I am trying to use the bubble sort method to organize a matrix. I am getting an error that says Segmentation fault (core dumped). I am programming on a Virtual Machine using Ubuntu and Codelite. Hope you can help me out.

This is the code.

#include <stdio.h>
#include <stdio.h>
#include <math.h>

int main(){

    int tam, comp, var;

    printf("Ingrese el tamano del array que va a crear:\n");
    scanf("%d", tam);

    int arr[tam];

    printf("Ingrese los elementos del array:\n");
    for(int i=0; i < tam; i++){
        printf("Elemento arr%d", i+1);
        scanf("%d", &arr[i]);        
    }

    for(int j=0; j < tam; j++){
        for(comp=0; comp<tam; comp++){

            if(arr[comp]<arr[comp+1]){

                var=arr[comp];
                arr[comp]=arr[comp + 1];
                arr[comp + 1]=var;               
            }
        }            
    }

    printf("La matriz en orden descendente es:\n");

    for(int i=0; i < tam; i++){

       printf("%d ", arr[i]);        
    }
}

Answer 1

the following proposed code:

1. cleanly compiles (gcc on linux)
2. performs the desired operation
3. does not seg fault
4. corrects the problems listed in the question comments
5. properly checks for I/O errors and properly routes error messages to stderr
6. keeps data closely related to where it is used.
7. makes use of appropriate horizontal spacing for readability
8. documents why each header file is being included

Suggest using puts() rather than printf() for output that does not contain any formatting.

and now the proposed code:

#include <stdio.h>    // printf(), scanf(), fprintf(), stderr
//#include <math.h>  <<-- contents not used, so do not include
#include <stdlib.h>   // exit(), EXIT_FAILURE

int main( void )
{
    int tam;

    printf( "Ingrese el tamano del array que va a crear:\n" );
    if( 1 != scanf( "%d", &tam ) )
    {
        fprintf( stderr, "scanf for 'tam' failed\n" );
        exit( EXIT_FAILURE );
    }

    // implied else, scanf successful


    int arr[tam];

    printf( "Ingrese los elementos del array:\n" );
    for( int i=0; i < tam; i++ )
    {
        printf( "Elemento arr%d", i+1 );
        if( 1 != scanf( "%d", &arr[i] ) )
        {
            fprintf( stderr, "scanf for array entry %d failed\n", i+1 );
            exit( EXIT_FAILURE );
        }

        // implied else, scanf successful.
    }

    for( int j=0; j < tam; j++ )
    {
        for( int comp=0; comp < (tam-1); comp++ ) // note correction and data scope limiting
        {

            if( arr[comp] < arr[comp+1] )
            {
                int var       = arr[comp];  // note data scope limiting
                arr[comp]     = arr[comp + 1];
                arr[comp + 1] = var;
            }
        }
    }

    printf( "La matriz en orden descendente es:\n" );

    for( int i=0; i < tam; i++ )
    {
       printf( "%d ", arr[i] );
    }
}