求方程式的根

*尚不清楚问题点* 巴西项目/
#include "stdafx.h"
#include <stdio.h>
#include <math.h>
float x1,x2,disc,p,q;

int main()
{
?void bigger(float,float);
?void equal(float,float);
?void smaller(float,float);
?float a,b,c;
?disc=b*b-4*a*c;
?printf("please input a,c:n");
?scanf("%f,%f,%f",&a,&b,&c);
?if(disc>0)
?{
??bigger(a,b);
??printf("x1=%fttx2=%fn",x1,x2);
??}
?else if(disc==0)
?{
??equal(a,x2);
??}
?else
?{
??smaller(a,b);
???? printf("x1=%fn,x2=%f",x2);
??}
?return 0;
}

void bigger(float a,float b) { ?x1=(-b+sqrt(disc))/(2*a); ?x2=(-b-sqrt(disc))/(2*a); } void equal(float a,float b) { ?x1=x2=-b/2*a; } void smaller(float a,float b) { ?p=-b/2*a; ?q=sqrt(-disc)/(2*a); }