For some Reason the Program Crashes at the Loop used to merge the two arrays in main.
though maybe this question is a foolish in one(idk it didn't allow me to post as my program is mostly code so now i am blabbering). (Well it still doesn't so here's a Picture of a Cat CAT )

 //To make two arrays of user Defined Size and merge them in a third array
    #include<stdio.h>
    #include<stdlib.h>
    void array(int**,int);
    void ini(int**,int);
    void display(int **,int);
    int main()
    {
        int *a1,*a2,*a3,s1,s2,i,j;
        printf("Enter Size of Array 1\n");
        scanf("%d",&s1);
        printf("Enter Size of Array 2\n");
        scanf("%d",&s2);
        ini(&a1,s1);
        ini(&a2,s2);
        ini(&a3,s1 s2);
        printf("Enter Elements of Array 1\n");
        array(&a1,s1);
        printf("Array 1:\n");
        display(&a1,s1);
        printf("Enter Elements of Array 2\n");
        array(&a2,s2);
        printf("Array 2:\n");
        display(&a2,s2);
        for(i=0;i<s1;i  )
        {
            a3[i]=a1[i];
        }
        for(i=0,j=s1;i<s2&&j<s1 s2;i  ,j  )
        {
            a3[j]=a2[i];
        }
        printf("Merged Array:\n");
        display(&a3,s1 s2);
        return 0;
    }
    void ini(int **a,int s)
    {
        *a=(int*)calloc(s,sizeof(int));
    }
    void array(int **a,int s)
    {
        int i;
        for(i=0;i<s;i  )
        {
            printf("Enter Element at position %d\n",i 1);
            scanf("%d",&a[i]);
        }
    }
    void display(int **a,int s)
    {
        int i;
        for(i=0;i<s;i  )
        {
            if(i==s-1)
            printf("%d\n",a[i]);
            else
            printf("%d\t",a[i]);
        }
    }

CodePudding user response：

a1, a2, and a3 is a pointer of an integer type variable, which stores the starting address of your buffer.

a1[index] is the value in the address of a1 with 'index' as the offset.

Since you were passing &a to your array() and display() function, you were passing the address of your variable into the function instead of passing the address of your buffer.

You could change your array() and display() to:

void array(int *a,int s)
{
    int i;
    for(i=0;i<s;i  )
    {
        printf("Enter Element at position %d\n",i 1);
        scanf("%d", &(a[i]));
    }
}
void display(int *a,int s)
{
    int i;
    for(i=0;i<s;i  )
    {
        if(i==s-1)
        printf("%d\n", a[i]);
        else
        printf("%d\t", a[i]);
    }
}

and call it like this:

array(a1,s1);
display(a1,s1);