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)
原文链接: https://www.cnblogs.com/noip/archive/2012/08/11/2633694.html
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