How can i use sprintf to keep track of how many characters have been printed on a line in c language

Question

I need to create a program that will count down from a specified number, using decrements of another specified number, however, to keep things neat, no more than 10 numbers can be printed on a line, or 70 characters. I have been given the hint to use sprintf to print the number to a string and then find the length of the formatted string. I have worked out the 10 numbers per line thing, however I am not really sure how to use sprintf to keep track of how many characters have been printed on the line, and I haven't been able to find any examples of the same sort of thing using the same function.

Any help is greatly appreciated :).

Answer 1

Another hint I suppose - you know how you can find out the length of that string with strlen... and compare that to your line limit of 70...

something like:

...

if(strlen(numberstring)>70)

{

   cprintf("\r\n");  /* newline */

   strcpy(numberstring,NULL);  /* reset numberstring to "" */

}

else

...

Hopefully you get it now... :)

Answer 2

Once you sprintf the string, you can count how many characters are in it:

char * currChar = stringResult[0];

int noOfChar

while(*currChar != '\0')

{

noOfChar++; //Add one to the number of good characters in the string

currChar++; //Advance the character pointer to the next character in the array

}

<sarcasm target = "Moxie1313">

Library functions that do tasks like these are clearly cheating! :-P

</sarcasm>