From 754bbf7a25a8dda49b5d08ef0d0443bbf5af0e36 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Sun, 7 Apr 2024 13:41:34 -0500 Subject: new repository --- devdocs/c/numeric%2Fmath%2Fexp.html | 90 +++++++++++++++++++++++++++++++++++++ 1 file changed, 90 insertions(+) create mode 100644 devdocs/c/numeric%2Fmath%2Fexp.html (limited to 'devdocs/c/numeric%2Fmath%2Fexp.html') diff --git a/devdocs/c/numeric%2Fmath%2Fexp.html b/devdocs/c/numeric%2Fmath%2Fexp.html new file mode 100644 index 00000000..0d02bb24 --- /dev/null +++ b/devdocs/c/numeric%2Fmath%2Fexp.html @@ -0,0 +1,90 @@ +

exp, expf, expl

Defined in header <math.h> 
float       expf( float arg );
+		 (1) (since C99) 
double      exp( double arg );
+		 (2) 
long double expl( long double arg );
+		 (3) (since C99)
Defined in header <tgmath.h> 
#define exp( arg )
+		 (4) (since C99)
+1-3) Computes e (Euler's number, 2.7182818...) raised to the given power arg.
+4) Type-generic macro: If arg has type long double, expl is called. Otherwise, if arg has integer type or the type double, exp is called. Otherwise, expf is called. If arg is complex or imaginary, then the macro invokes the corresponding complex function (cexpf, cexp, cexpl).

Parameters

+ +
arg - floating point value

Return value

If no errors occur, the base-e exponential of arg (earg) is returned.

+

If a range error occurs due to overflow, +HUGE_VAL, +HUGE_VALF, or +HUGE_VALL is returned.

+

If a range error occurs due to underflow, the correct result (after rounding) is returned.

+

Error handling

Errors are reported as specified in math_errhandling.

+

If the implementation supports IEEE floating-point arithmetic (IEC 60559),

+

Notes

For IEEE-compatible type double, overflow is guaranteed if 709.8 < arg, and underflow is guaranteed if arg < -708.4.

+

Example

#include <errno.h>
+#include <fenv.h>
+#include <float.h>
+#include <math.h>
+#include <stdio.h>
+// #pragma STDC FENV_ACCESS ON
+ 
+int main(void)
+{
+    printf("exp(1) = %f\n", exp(1));
+    printf("FV of $100, continuously compounded at 3%% for 1 year = %f\n",
+            100*exp(0.03));
+    // special values
+    printf("exp(-0) = %f\n", exp(-0.0));
+    printf("exp(-Inf) = %f\n", exp(-INFINITY));
+    //error handling
+    errno = 0; feclearexcept(FE_ALL_EXCEPT);
+    printf("exp(710) = %f\n", exp(710));
+    if (errno == ERANGE)
+        perror("    errno == ERANGE");
+    if (fetestexcept(FE_OVERFLOW))
+        puts("    FE_OVERFLOW raised");
+}

Possible output:

+
exp(1) = 2.718282
+FV of $100, continuously compounded at 3% for 1 year = 103.045453
+exp(-0) = 1.000000
+exp(-Inf) = 0.000000
+exp(710) = inf
+    errno == ERANGE: Numerical result out of range
+    FE_OVERFLOW raised

References

See also

+ + + + +
+
(C99)(C99)(C99)
 computes 2 raised to the given power (\({\small 2^x}\)2x)
(function)
+
(C99)(C99)(C99)
 computes e raised to the given power, minus one (\({\small e^x-1}\)ex-1)
(function)
+
(C99)(C99)
 computes natural (base-e) logarithm (\({\small \ln{x} }\)ln(x))
(function)
+
(C99)(C99)(C99)
 computes the complex base-e exponential
(function)
C++ documentation for exp
+

+ © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
+ https://en.cppreference.com/w/c/numeric/math/exp +

+
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