round up to x decimals in printf

[loloxx]

Hello again ^^

double rou=3.14195;
          printf("%f rounded = %.4f\n\n", rou, rou);

output: 3.14195 rounded = 3.1420

Is it posible for me to put a variable where the number 4 is?
So I can round up to x decimals instead of a constant?

Thanks for your time and help

[grumpy]

First create a format string using sprintf(). Then supply that format string to the printf() call.

[ZuK]

try to put something like that in a function

int num_dec = 4;
double rou=3.14195;
char fmt[32];
sprintf(fmt,"%f rounded = %%0.%df\n\n", rou,num_dec);
printf(fmt, rou);

Kurt

[anduril462]

You can put an * in the format specifier:

printf("%f rounded to %d places is %.*f\n", rou, num_dec, num_dec, rou);

That * in blue means that you are going to pass the precision for the %f as the next parameter to printf.

[loloxx]

Thank you for your quick replies!
Really appreciate it!
Used andurils462 method at the end.
Solved my problem.

Thanks again for your time and help!

Lolo