I need some help with my code

Question

I wrote a code in C for a program that calculates the largest digit of a number. The problem is that it works for positive numbers, but not for negative ones. What should I do to make it work for both?

int main()
{
int a;
scanf("%i", &a);
int b=0;
while (a)
{
if (a%10>b)
b=a%10;
a=a/10;

}
printf("The largest digit is %i", b);
return 0;
}

Answer 1

Import stdlib.h and use the abs() method

Answer 2

Instead of your while loop you can also do:
a = abs(a);
while(a >= 10){
a /=10;
}

Answer 3

Thanks for your advices! It finally worked! :))

Answer 4

You need to check input for <a>, and switch it to positive when and if input number is a negative number. Your approach may not work as expected when input number is negative number.

If <a> is less than zero
Change <a> to positive number

Answer 5

https://code.sololearn.com/cIm2ghRLoqb4/?ref=app