Quang Anh Le / Mbed 2 deprecated Gleitkommaoperation

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Dependencies:   mbed

main.cpp@0:cc171456477d, 2019-08-05 (annotated)

Committer:
QuangAnhLe
Date:
Mon Aug 05 17:49:57 2019 +0000
Revision:
0:cc171456477d
1.commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
QuangAnhLe 0:cc171456477d 1 #include "mbed.h"
QuangAnhLe 0:cc171456477d 2
QuangAnhLe 0:cc171456477d 3 #define sqr(x) (x)*(x)
QuangAnhLe 0:cc171456477d 4 #define abs(x) (x)<0 ? -(x):(x)
QuangAnhLe 0:cc171456477d 5 Serial pc(PA_2,PA_3);
QuangAnhLe 0:cc171456477d 6
QuangAnhLe 0:cc171456477d 7 // sin(x)0 x- (x^3/3!)+(x^5/5!)-(x^7/7!)+ (x^9/9!)- (x^11/!)+...
QuangAnhLe 0:cc171456477d 8 float mysin(float x)
QuangAnhLe 0:cc171456477d 9
QuangAnhLe 0:cc171456477d 10 {
QuangAnhLe 0:cc171456477d 11 float sinx=x;
QuangAnhLe 0:cc171456477d 12 float term=x;
QuangAnhLe 0:cc171456477d 13 int step=2;
QuangAnhLe 0:cc171456477d 14 int sign=-1;
QuangAnhLe 0:cc171456477d 15
QuangAnhLe 0:cc171456477d 16 do
QuangAnhLe 0:cc171456477d 17 {
QuangAnhLe 0:cc171456477d 18 term *= sqr(x)/(step*(step+1));
QuangAnhLe 0:cc171456477d 19 sinx += term * sign;
QuangAnhLe 0:cc171456477d 20 step += 2;
QuangAnhLe 0:cc171456477d 21 sign *= -1;
QuangAnhLe 0:cc171456477d 22 }
QuangAnhLe 0:cc171456477d 23 while (abs (term) >0.00001F);
QuangAnhLe 0:cc171456477d 24
QuangAnhLe 0:cc171456477d 25 return sinx;
QuangAnhLe 0:cc171456477d 26 }
QuangAnhLe 0:cc171456477d 27
QuangAnhLe 0:cc171456477d 28
QuangAnhLe 0:cc171456477d 29 int main() {
QuangAnhLe 0:cc171456477d 30
QuangAnhLe 0:cc171456477d 31
QuangAnhLe 0:cc171456477d 32 float x= 0;
QuangAnhLe 0:cc171456477d 33
QuangAnhLe 0:cc171456477d 34 pc.baud(115200);
QuangAnhLe 0:cc171456477d 35 while(1)
QuangAnhLe 0:cc171456477d 36 {
QuangAnhLe 0:cc171456477d 37
QuangAnhLe 0:cc171456477d 38 pc.printf("#A%f\r\n",10*mysin(x));
QuangAnhLe 0:cc171456477d 39
QuangAnhLe 0:cc171456477d 40 x=x+0.01F;
QuangAnhLe 0:cc171456477d 41 if (x > 6.28F)
QuangAnhLe 0:cc171456477d 42 x=0;
QuangAnhLe 0:cc171456477d 43
QuangAnhLe 0:cc171456477d 44 wait(0.1);
QuangAnhLe 0:cc171456477d 45 }
QuangAnhLe 0:cc171456477d 46
QuangAnhLe 0:cc171456477d 47 }