C Tutorial/stdio.h/vscanf vfscanf vsscanf

vscanf, vfscanf, and vsscanf

Item Value Header file stdarg.h stdio.h Declaration int vscanf(char * restrict format, va_list arg_ptr); int vfscanf(FILE * restrict stream, const char * restrict format,va_list arg_ptr); int vsscanf(char * restrict buf, const char * restrict format, va_list arg_ptr);

The functions vscanf(), vfscanf(), and vsscanf() are functionally equivalent to scanf(), fscanf(), and sscanf(), respectively, except that the argument list has been replaced by a pointer to a list of arguments. This pointer must be of type va_list, which is defined in the header <stdarg.h>.

<source lang="cpp">#include <stdio.h>

 #include <stdarg.h>
 void get_message(char *format, ...)
 {
   va_list ptr;
   va_start(ptr, format);
   vscanf(format, ptr);
   va_end(ptr);
 }
 int main(void)
 {
   int i;
   printf("integer:");
   get_message(" %d ", &i);
   printf("%d", i);
   return 0;
 }</source>