#include<stdio.h>#include<math.h>int main(){ float f(float,float,float); float F1(float,float,float); float F2(float,float,float); float x1,x2,x3,a,b,c; printf("請分別輸入a,b,c的數值：\n"); scanf("%f%f%f",&a,&b,&c); x1=F1(a,b,c); x2=F2(a,b,c); x3=(-b)/(2*a); printf("當b^2-4ac大於0時，x1=%g, x2=%g\n",x1,x2); printf("當b^2-4ac等於0時，x=%g\n", x3); printf("當b^2-4ac小於0時，無解\n");}float f(float x,float y,float z){return(float)(sqrt(y*y-4*x*z));}float F1(float x,float y,float z){return(-y+f(x,y,z))/(2*x);}float F2(float x,float y,float z){return(-y-f(x,y,z))/(2*x);}