Thread: Using write() to display an integer in the output

So currently just about tried everything with the best of my knowledge to get this to work but I have been hitting a wall it seems.

Code:

#include <stdio.h>#include <string.h>


main(){
        int i, len;
        char name[20], length;
        unsigned x;
        char len_str[10];


        write(1,"Enter your last name: ",21);
        fflush(stdout);
        len = read(fileno(stdin),name,20);len--;name[len] = 0;




        write(1,"Name entered is ",16);
        write(1,name,len);
        write(1," length is ",11);

// !!!!THIS PART!!! //
// My attempt to work around with no luck //
        len_str[0] =  len;
        len_str[1] = 0;
        write(1,len_str, 2);
        write(1,". \n", 3);

//Clearly works here//
        printf("%d\n", len);
}

I have tried casting write(1,(char) len, 1); tried passing it without casting, tried to make a pointer pointing to it and then passing that through but no luck empty space where the number should appear. I know that len is correct because of printf... but the goal is to not use printf just write() and not putchar, or >> and im having no luck finding any solutions.

This is only a section of the code without my comments (sorry) just trying to find a solution to the writing issue, maybe i missed something and a source of where i can go to find the answer could be of help (or a solution ), thanks!

Laserlight - i have the program working with printf because it was easy, but the assignment is to not use any of the printf() or sprintf()
i suppose i just am not clear on how to go about making the int into a readable entity for the write(), from what i can tell if i pass a array of char's though it with a 0("null") indicating the end it works fine because write(1,name,len); works perfect but write(1,len_str, 2); does not when i try.

Oogabooga- Sorry, im a C/C++ programming newbie and i dont understand waht you mean by adding it to char '0'

Oogabooga - Awesome, worked perfect once I got what was happening.
Now I have another question for you or anyone, is there anyway to compare the bits within a unsigned variable?

Code:

unsigned x, y;
... (store some char)
(for loop 8 times)
if (x > y){ 
y=x>>1;}
else
x>>=1;
...

the idea is to find the largest valued unsigned bit and shift to the left so for example; 0 0 0 0 0 0 0 1 --> shift till its at 1 0 0 0 0 0 0 0
Or if there is no way to do compare at the bit level let me know, i have an idea of another work around but just for my knowledge