write printf( ) so that the width of a field can be specified at runtime

32. How do I write printf( ) so that the width of a field can be specified at runtime?

Ans: This is shown in following code snippet.

main( )

{

int w, no ;

printf ( "Enter number and the width for the

number field:" ) ;

scanf ( "%d%d", &no, &w ) ;

printf ( "%*d", w, no ) ;

}

Here, an '*' in the format specifier in printf( ) indicates that an int value from the argument list should be used for the field width.