Print a variable number of digits of a double using printf

Question

Anyone knows if it is possible to use printf to print a VARIABLE number of digits?

The following line of code prints exactly 2:

printf("%.2lf", x);

but let's say I have a variable:

int precision = 2;

Is there a way to use it in printf to specify the number of digits?

Otherwise I will have to write a 'switch' or 'if' structure.

Thanks

Answer 1

It is possible:

#include <stdio.h>

int main() {
    int precision = 3;
    float b = 6.412355;
    printf("%.*lf\n",precision,b);
    return 0;
}

Answer 2

Yes, you can do that easily -

int precision = 2;
printf("%.*lf", precision, x);