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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);
}
/*
Output:
3.1415926535897931160
*/
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