Print an int in C without Printf or any functions

Question

I have an assignment where I need to print an integer in C without using printf, putchar, etc. No header files allowed to be included. No function calls except for anything

Answer 1

One option might be to do this recursively, so the number gets printed out in the right order.

In this case, instead of a do/while loop, you'd have a construction more like this, with a base case of num=0.

if(num==0)
    return;

j = num % 10;
c = j + '0';
my_int(num/10);
my_char(c);

Edit: Noticed that you aren't allowed to use recursion. It's a bit ugly, but you could check for the digits in the number, and then loop backwards across the number.

To find the number of digits,

int digitDivide = 1;
int tempNum = num;
while(tempNum>0){
    tempNum= tempNum/10;
    digitDivide=digitDivide*10;
}

and then use that to loop through the number as follows:

digitDivide = digitDivide/10;
while(digitDivide>0){
    tempNum = (num/digitDivide)%10;
    c = j + '0';
    my_char(c);
    digitDivide=digitDivide/10;
}