Specifying the index of the C-formatted parameter

This format position specification also exists in C/C ++

For example:

sprintf(buf, "row=%2$i column=%3$i value=%1$lf",value,row,column);

Unfortunately it is not standard on all platforms, with MS Visual C ++ 6.0 for example it does not work, it would print this:

row=$i column=$i value=$lf

Therefore this indexed format should only be used in Tcl, but not in C / C ++.