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The e specification is for displaying floating-point numbers in
scientific notation. Note that xs are included in the
printf statement to clarify the placement of padding characters:
Display float or double:
printf ("x %e x\n", 27182.8); printf ("x %e x\n", -0.000271828);
printf ("Using E produces an upper-case E, as in x %E x.\n", 27182.8);
--- Result ---
x 2.718280e+04 x
x -2.718280e-04 x
Using E produces an upper-case E, as in x 2.718280E+04 x.
Display with two digits following the decimal point:
printf ("x %.2e x\n", 27182.8); printf ("x %.2e x\n", -0.000271828);
--- Result ---
x 2.72e+04 x
x -2.72e-04 x
Display with spaces, if necessary, to fill a 10-character field:
printf ("x %10.2e x\n", 27182.8);
printf ("x %10.2e x\n", -0.000271828);
--- Result ---
x 2.72e+04 x
x -2.72e-04 x
Display with spaces, if necessary, to fill a 10-character field; if more than 10 characters are involved, display them all anyway:
printf ("x %10e x\n", 27182.8); printf ("x %10e x\n", -0.000271828);
--- Result ---
x 2.718280e+04 x
x -2.718280e-04 x
Display with spaces, on the right, if necessary:
printf ("x %-10.2e x\n", 27182.8);
printf ("x %-10.2e x\n", -0.000271828);
--- Result ---
x 2.72e+04 x
x -2.72e-04 x
Always include sign:
printf ("x %+10.2e x\n", 27182.8);
printf ("x %+10.2e x\n", -0.000271828);
--- Result ---
x +2.72e+04 x
x -2.72e-04 x