C++ 中的数学计算函数

这是我从网上搜集来的,值得看看。

 1 #include <iostream>
 2   #include <cmath>
 3   using namespace std;
 4   int main()
 5   {
 6    double pi,e,n;
 7    int i;
 8    pi = acos(-1.0);
 9    e = exp(1.0);
10    cout << "abs(-10) = " << abs(-10) << "\n";//求整数的绝对值
11    cout << "fabs(-10.8) = " << fabs(-10.8) << "\n";
12    cout << "asin(0.5) = " << asin(0.5) << " (π/6)\n";
13    cout << "atan(1.0) = " << atan(1.0) << " (π/4)\n";
14    cout << "atan2(1.0,√3) = " << atan2(1.0,sqrt(3.0)) << " (π/6)\n";
15    cout << "sin(π/2) = " << sin(pi / 2.0) << "\n";
16    cout << "sinh(π/2) = " << sinh(pi /2.0 ) << "\n";
17    cout << "cos(π/2) = " << cos(pi / 2.0) << " (≈0.0)\n";
18    cout << "cosh(π/2) = " << cosh(pi /2.0 ) << "\n";
19    cout << "tan(π/4) = " << tan(pi / 4) << "\n";
20    cout << "tanh(π/4) = " << tanh(pi /4 ) << "\n";
21    cout << "ceil(1.3) = " << ceil(1.3) << "\n";
22    cout << "ceil(-1.3) = " << ceil(-1.3) << "\n";
23    cout << "floor(1.3) = " << floor(1.3) << "\n";
24    cout << "floor(-1.3) = " << floor(-1.3) << "\n";
25    cout << "log(e*e) = " << log(e*e) << "\n";
26    cout << "log10(1000.0) = " << log10(1000.0) << "\n";
27    cout << "fmod(10.2,3.0) = " << fmod(10.2,3.0) << "\n";
28    cout << "fmod(-10.2,3.0) = " << fmod(-10.2,3.0) << "\n";
29    cout << "pow(25.0,2.0) = " << pow(25.0,2.0) << "\n";
30    cout << "modf(-12.3435,&n) = " << modf(-12.3435,&n) << ",";
31    cout << "n = " << n << "\t-12.3435 = n + modf(-12.3435,&n)\n"; 
32    cout << "frexp(17.0,&i) = " << frexp(17.0,&i) << ",";
33    cout << "i = " << i << "\t17.0 = frexp(17.0,&i)*2^i\n";
34    cout << "ldexp(0.53125,5) = " << ldexp(0.53135,5) << "\tldexp(0.53125,5)=0.53125*2^5\n";
35    return 0;
36   }
37   /*
38   输出结果:
39   abs(-10) = 10
40   fabs(-10.8) = 10.8
41   asin(0.5) = 0.523599 (π/6)
42   atan(1.0) = 0.785398 (π/4)
43   atan2(1.0,√3) = 0.523599 (π/6)
44   sin(π/2) = 1
45   sinh(π/2) = 2.3013
46   cos(π/2) = 6.12303e-017 (≈0.0)
47   cosh(π/2) = 2.50918
48   tan(π/4) = 1
49   tanh(π/4) = 0.655794
50   ceil(1.3) = 2
51   ceil(-1.3) = -1
52   floor(1.3) = 1
53   floor(-1.3) = -2
54   log(e*e) = 2
55   log10(1000.0) = 3
56   fmod(10.2,3.0) = 1.2
57   fmod(-10.2,3.0) = -1.2
58   pow(25.0,2.0) = 625
59   modf(-12.3435,&n) = -0.3435,n = -12 -12.3435 = n + modf(-12.3435,&n)
60   frexp(17.0,&i) = 0.53125,i = 5 17.0 = frexp(17.0,&i)*2^i
61   ldexp(0.53125,5) = 17.0032 ldexp(0.53125,5)=0.53125*2^5
62   */
63   /*
64   abs; acos; asin; atan; atan2; ceil;cos; cosh; exp;
65   fabs; floor; fmod; frexp; ldexp; log;log10; modf; pow;
66   sin; sinh; sqrt;tan; tanh;
67   acosf; asinf; atanf; atan2f; ceilf; cosf; coshf; expf;
68   fabsf; floorf; fmodf; frexpf; ldexpf; logf;
69   log10f; modff; powf; sinf; sinhf; sqrtf; tanf; tanhf;
70   acosl; asinl; atanl; atan2l; ceill; cosl; coshl; expl;
71   fabsl; floorl; fmodl; frexpl; ldexpl; logl; 
72   log10l; modfl; powl; sinl; sinhl; sqrtl; tanl; tanhl;
73   */(王朝网络 wangchao.net.cn)
posted on 2012-08-11 15:33  怡红公子  阅读(976)  评论(0编辑  收藏  举报