c语言求方程ax方+bx+c=0的根,用3个函数分别求当b方-4ac大于0,等于0,小于0的根,主函数输入a,b,c

#include #include void result(float a,float b,float c){ float x1,x2; if(sqrt(b*b-4*a*c)>=0){ x1=(-b+sqrt(b*b-4*a*c))/(2*a); x2=(-b-sqrt(b*b-4*a*c))/(2*a); if(x1==x2) printf("the result is x=%.3f\n",x1); else printf("the resul