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Today, I would like to share with you the relevant knowledge points about how to use C++ 's math function. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article.

Include header file

# include1, fabs (double x)

Take the absolute value of the variable of double type

# includeusing namespace std;#includeint main () {double dazzle color 3.14; printf ("% .2f\ n", fabs (d)); return 0;} 2, floor (double x) ceil (double x)

For a variable of double type, and the return type is also

Round down: floor

Round up: ceil

# includeusing namespace std;#includeint main () {double D1 colors 3.14; double d2 colors 3.14; printf ("% .0f% .0f\ n", floor (D1), ceil (D1)); printf (".0f% .0f\ n", floor (D2), ceil (D2)); return 0;}

-4-3

3 4

3. Pow (double xperfine double n)

Returns x to the nth power

# includeusing namespace std;#includeint main () {double d=pow (2.0 focus 3.0); printf ("% f\ n", d); return 0;}

8.000000

4. Sqrt (double x)

Returns the arithmetical square root of a variable of the multiplier type

# includeusing namespace std;#includeint main () {double d=sqrt (3.0); printf ("% f\ n", d); return 0;} 5, log (double x)

Returns the logarithm based on the natural logarithm e

# includeusing namespace std;#includeint main () {double d=log (exp (1)); / / exp (1) means e printf ("% f\ n", d); double d1=log10 (10.0); printf ("% f\ n", D1); double d2=log2 (2); printf ("% f\ n", D2); double d3=log1p (10); / / more precise printf ("% f\ n", D3); double d4=log (10) Printf ("% f\ n", d4); return 0;}

1.000000

1.000000

1.000000

2.397895

2.302585

6. Sin (double x) cos (double x) tan (double x)

The parameter requirement is Radian system.

There are also corresponding inverse functions.

# includeusing namespace std;#includeconst double PI=acos; / / because cos (pi) =-1int main () {double d=sin (PI/4); printf ("% f\ n", d); double d1=cos (PI/4); printf ("% f\ n", D1); double d2=tan (PI/4); printf ("% f\ n", D2); double d3=asin (1); printf ("% f\ n", D3) Double d4=atan (1); printf ("% f\ n", d4); return 0;} 7, round (double x)

Round the round variable, and return double.

That's all of the article "how to use C++ 's math function". Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more knowledge, please pay attention to the industry information channel.

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