How to find the largest and smallest possible number from an input integer?-CodePudding

I am trying to find the largest and smallest possible value from an integer which is taken as an input from the user. For example - If the user enters the number 3859428, I want to find 9885432 and 2345889.

Here is my code -:

  #include <stdio.h>

int main()
{
    int num[100], original, remainder, min=0, max=0, count=0, i, j;

    printf("Enter a number : ");
    scanf("%[^\n]", num);

    original = num;

    i=0;

    while(num!=0)
    {
        num/=10;
        num[i]=num;
        count  ;
        i  ;
    }

    for(i=0; i<count, num!=0; i  )
    {
        for(j=i 1; j<count, num!=0; j  )
        {
            if(num[i]<num[j])
            {
                min=min*10 num[i];
                num/=10;
            }
        }
    }

    while(min!=0)
    {
        remainder=min;
        max=max*10 remainder;
        min/=10;
    }

    printf("The difference between largest(%d) and smallest(%d) of the integer %d is %d.\n", max, min, original, max-min);
 
return 0; 

}

I am getting 2 errors -

"assignment to expression with array type"

on line 16 and 29, and 2 warnings -

"assignment to 'int' from 'int*' makes integer from pointer without a cast"

on line 10 and 17.

I don't know what these mean and how to accomplish my task. Any help would be great.

Thank You.

CodePudding user response：

What you are trying to do can be done much simpler. There is no need to parse the input as a number at all, no need to convert it into binary form and then extract decimal digits from it to reorder them.

The same result can be achieved simply by reading a string and sorting it for the minimal number (potentially drop leading '0') and reversing it for the maximum.

CodePudding user response：

I believe what you are trying to achieve is to input some number, and then reorder it's digits to achieve a maximum and minimum value:

int num[100];
scanf("%[^\n]", num);

First of all I would recommend either setting scanf() to parse the input to an integer:

int number;
scanf("%d", &number);

Or using an string (array of chars) to hold your digits one by one. (I'm going to continue this way).

//Initialize all elements to '\0', in order to know where the user input ended.
char digits[100] = {'\0'}; 
scanf("