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Formatting and I/O Library Chapter 2
LabWindows/CVI Standard Libraries 2-52 © National Instruments Corporation
Fmt (buf, "%s<%f[p0]", x); /* result: "12." */
x = 12.345;
Fmt (buf, "%s<%f[p6]", x); /* result: "12.345000" */
x = -12.345;
Fmt (buf, "%s<%f[w12]", x); /* result: "-12.345" */
x = -12.3456789;
Fmt (buf, "%s<%f[w6]", x); /* result: "-12.3*" */
x = 0.00000012;
Fmt (buf, "%s<%f[p8]", x); /* result: "0.00000012" */
x = 0.00000012;
Fmt (buf, "%s<%f", x); /* result: "1.2e-007" */
x = 4.5e050;
Fmt (buf, "%s<%f", x); /* result: "4.5e050" */
Remarks
The results shown are the contents of
buf
after each call to
Fmt
. The last two calls demonstrate
that very large and very small values are sometimes forced into scientific notation even when the
e
modifier is absent.
Real to String in Scientific Notation
char buf[20];
double x;
x = 12.3456789;
Fmt (buf, "%s<%f[e]", x); /* result: "1.234568e+001" */
x = 12.3456789;
Fmt (buf, "%s<%f[ep2]", x); /* result: "1.23e+001" */
x = 12.3456789;
Fmt (buf, "%s<%f[e2p2]", x); /* result: "1.23e+01" */
x = 12.345;
Fmt (buf, "%s<%f[e]", x); /* result: "1.234500e+001" */
x = 12.345;
Fmt (buf, "%s<%f[ep2w12]", x); /* result: " 1.23e+001" */
x = 12.345;
Fmt (buf, "%s<%f[ep2w6]", x); /* result: "1.23e*" */
Remarks
The results shown are the contents of
buf
after each call to
Fmt
. The last call demonstrates
what occurs when the width specified by the
w
modifier is too small.