Thread: A Problem Between "creating an array using rand()" and "the use of bubble"

I would like to create an array which has 99 elements using function rand(). I created, and sorted with function bubblesort. But I met something that I cannot construe. The array was sorted as changed. The elements of array have changed. Why? What do you think about it? How it could be happen?

Code:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define SIZE 99


void bubblesort(int[],int);


int main()
{
    int response[SIZE];
    int i;


    srand(time(NULL));


    for(i=0;i<SIZE;i++){
        response[i]= 1 + rand()%9;
    }


    printf("An Array which is created with function rand() :\n");
    for(i=0;i<SIZE;i++) {
        if(i%10==0) {
            printf("\n%3d",response[i]);
        }
        else
            printf("%3d",response[i]);
    }


    bubblesort(response,SIZE);
    
    printf("\n\n\nAfter using bubble sort, Array :\n");
    for(i=0;i<SIZE;i++) {
        if(i%10==0) {
            printf("\n%3d",response[i]);
        }
        else
            printf("%3d",response[i]);
    }

    return 0;
}


void bubblesort(int array[],int length)
{
    int pass,compare,hold;


    for(pass=0; pass<length; pass++){
        for(compare=0; compare<length-1; compare++){
            if(array[compare] > array[compare+1]){
                //int hold;
                hold = array[compare];
                array[compare] = array[compare+1];
                array[compare+1] = array[compare];
            }
        }
    }
}

*I tried to this programme with small-scale numbers. And it worked successfully. The programme with small-scale numbers is in the following:

Code:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define SIZE 10


void bubblesort(int[],int);


int main()
{
    int response[SIZE];
    int i;


    srand(time(NULL));


    for(i=0;i<SIZE;i++){
        response[i]= 1+ rand() %3;
    }


    for(i=0;i<SIZE;i++){
        printf("%3d",response[i]);
    }


    bubblesort(response,SIZE);


    printf("\n\n\nAfter using bubble sort, Array :\n");
    for(i=0;i<SIZE;i++) {
        printf("%3d",response[i]);
    }




    return 0;
}


void bubblesort(int array[],int length)
{
    int pass,hold,compare;


        for(pass=0;pass<length;pass++) {
        for(compare=0;compare<SIZE-1;compare++) {
            if(array[compare]>array[compare+1]) {
                hold = array[compare];
                array[compare]=array[compare+1];
                array[compare+1]=hold;
            }
        }
    }


}

When I was preparing to share the code here, I forgot something like if-else expression to display well. Now, I editted the code again.

I notice that if preprocess #define SIZE 10 expression is incremented in the second program such as 20,30,...90 , the programme can be run correctly. But after the first programme is builded and run, it's displayed as folows or something like that:



I cannot find difference or differences between two programs above. Don't have to that both are being run properly?

Note: I editted inside loop-for, e.i. if(i%10==0)), in the second programme to display very well if you increment the preprocess SIZE.

Code:

//SECOND PROGRAMME(SMALL-SCALE NUMBERS)
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define SIZE 10




void bubblesort(int[],int);




int main()
{
    int response[SIZE];
    int i;




    srand(time(NULL));




    for(i=0;i<SIZE;i++){
        response[i]= 1+ rand() %3;
    }




    printf("An Array which is created with function rand() :\n");
    for(i=0;i<SIZE;i++) {
        if(i%10==0) {
            printf("\n%3d",response[i]);
        }
        else
            printf("%3d",response[i]);

    }


    bubblesort(response,SIZE);




    printf("\n\n\nAfter using bubble sort, Array :\n");
    for(i=0;i<SIZE;i++) {
        if(i%10==0) {
            printf("\n%3d",response[i]);
        }
        else
            printf("%3d",response[i]);

    }


    return 0;
}




void bubblesort(int array[],int length)
{
    int pass,hold,compare;




        for(pass=0;pass<length;pass++) {
           for(compare=0;compare<SIZE-1;compare++) {
               if(array[compare]>array[compare+1]) {
                  hold = array[compare];
                  array[compare]=array[compare+1];
                  array[compare+1]=hold;
               }
           }
       }
}