Printing long double value with 19 digits after the decimal point in C language

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You can use %LF for long double format specifier in C, but to print the 19 digits after the point, we have to use ".19" before the format specifier, so it would be "%.19LF"
see the example…

#include <stdio.h>
int main(){
    long double x = 3.141592653589793213456;
    printf("%.19LF", x);
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