C language, find the root of quadratic equation AX2 + BX + C = 0

#include"stdio.h"
#include"math.h"
void yici(int a,int b)
{
double x=-b/a;
printf("x=%lf\n",x);
}
void erci(int a,int b,int c)
{
int data;
double x1,x2;
data=b*b-4*a*c;
if(data

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