Return Value
On success, the total number of characters written is returned. This count does not include the additional null-character automatically appended at the end of the string.
On failure, a negative number is returned.
Example
1 2 3 4 5 6 7 8 9 10 11/* sprintf example */ #include <stdio.h> int main () { char buffer [50]; int n, a=5, b=3; n=sprintf (buffer, "%d plus %d is %d", a, b, a+b); printf ("[%s] is a %d char long string\n",buffer,n); return 0; }
Output:
[5 plus 3 is 8] is a 13 char long string