C Tutorial/stdio.h/snprintf
snprintf
Item Value Header file stdio.h Declaration int snprintf(char * restrict buf, size_t num, const char * restrict format, ...) Function It is identical to sprintf() except that a maximum of num-1 characters will be stored.
#include <stdio.h>
int main ()
{
char buffer [50];
int n, a=5, b=3;
n=snprintf (buffer, 5,"%d plus %d is %d", a, b, a+b);
printf ("[%s] is a %d char long string\n",buffer,n);
return 0;
}