c语言用弦截法求方程

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1、//用弦截法求方程飞f（x）=x*x*x-5*x*x+16*x-80=0#include#includefloatf(floatx){floaty;y=((x-5.0)*x+16.0)*x-80.0;returny;}floatxpoint(floatx1,floatx2){floatx;x=(x*f(x2)-x2*f(x1))/(f(x2)-f(x1));returnx;}floatroot(floatx1,floatx2){floatx,y,y1;y1=f(x1

2、);do{x=xpoint(x1,x2);y=f(x);if(y*y1>0){y1=y;x1=x;}elsex2=x;}while(fabs(y)>=0.0001);returnx;}voidmain(){floatx1,x2,f1,f2,x;do{printf("inputx1,x2:");scanf("%f%f",&x1,&x2);f1=f(x1);f2=f(x2);}while(f1*f2>=0);x=root(x1,x2);printf("Arootofequationis%8.4"

3、,x);}