Printing float values with sprintf

问题

Right now I have:

printf('Rating: %.2F', $rating);

which prints like:

4.00

How can I show the leading zero, only if there is something to show after it?

For example:

• 4.00 should be 4
• 4.20 should be 4.2
• 4.02 should be 4.02 :)

回答1:

printf("Rating: %g\n", 4.00);
printf("Rating: %g\n", 4.20);
printf("Rating: %g\n", 4.02);

prints

Rating: 4
Rating: 4.2
Rating: 4.02

So will printing the values without printf

demo

来源：https://stackoverflow.com/questions/8204963/printing-float-values-with-sprintf