Format character%* s

Knowledge point

Width and precision format parameters

• It can be omitted
• Or embedded in the format string （ Such as %8s,%9.2f）.
• Or in the format string by * instructions , At this time, it is passed as another function parameter .

for example ,printf("%*d", 5, 10) Will print 10, The total width is 5 Characters .
and printf("%.*s", 3, "abcdef") Will print abc.

%*s

#include <stdio.h>
int main(void)
{
    
	char buf[]="ABCDEFG123456789";
	printf("%*s", 10, buf);
	return 0;
} 

Running results

ABCDEFG123456789

here ,*s Express s Is a variable length , Its length must be indicated by the first parameter after it , The second parameter indicates its content .

• Indicates that the print length is variable
• The next first parameter indicates its length
• The second parameter indicates its content

%.*s

#include <stdio.h>
int main(void)
{
    
	char buf[]="ABCDEFG123456789";
	printf("%.*s", 10, buf);
	return 0;
} 

Running results

ABCDEFG123

therefore ,

• * Specified by parameters .
• %*s At least * Characters , Fill in the blanks .
• %.*s Most expressed * Characters , Too much .
  Empathy ,%*.*f