例86.c*米***函数的调用*米**米*米**** +t include <math. h> float: root(x1, x2) float: x1: x2: nt: i, float: x, y, y1 y1=f(x1) do X=xpoint (Xl, X 2) y=f(x) f(y*y1>0) float xpoint(x1, x2) float x1 x2 y⊥=y float y x1=x; y=(XIf(x 2)-x2*f(x1) /(f(x2)-f(x1) e⊥se return (y) x2=X fwhile (fabs(y)>=0. 0001) return (x)***例8_6.c ******** 函数的调用 ******************** # include <math.h> float root(x1,x2) float x1,x2; { int i; float x,y,y1; y1=f(x1); do { x=xpoint(x1,x2); y=f(x); if (y*y1>0) { y1=y; x1=x; } else x2=x; }while (fabs(y)>=0.0001); return (x); } float xpoint(x1,x2) float x1,x2; { float y; y=(x1*f(x2)-x2*f(x1)) /(f(x2)-f(x1)); return (y); }