For floating arguments, precision indicates how many digits are printed after decimal points. : printf Precision « printf scanf « C Tutorial

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C Tutorial » printf scanf » printf Precision 
4.9.1.For floating arguments, precision indicates how many digits are printed after decimal points.
#include <stdio.h>
main()
{
    printf("%10.4e\n", 35.99999);
}
 
3.6000e+01
4.9.printf Precision
4.9.1.For floating arguments, precision indicates how many digits are printed after decimal points.
4.9.2.Precision
4.9.3.Using precision while printing integers, floating-point numbers, and strings
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