解方程

Posted 2022-06-22 T技术沙龙

 #include<stdio.h>
#include<math.h>
float x1,x2;
void sit1(float a,float b)

  x1=x2=-b/(2.*a);

void sit2(float a,float b,float disc)

  x1=(-b+sqrt(disc))/(2.*a);
  x2=(-b-sqrt(disc))/(2.*a);

void sit3(float a,float b,float disc)

  float realpart,imagepart;
  realpart=-b/(2.*a);
  imagepart=sqrt(-disc)/(2.*a);
  x1=realpart+imagepart;
  x2=realpart-imagepart;

void main()

  float a,b,c,disc;
  scanf("%f,%f,%f",&a,&b,&c);
  printf("The equation ");
  if(fabs(a)<=1e-6)
    printf("is not a quadratic/n");
  else
 
    disc=b*b-4.*a*c;
    if(fabs(disc)<=1e-6)
     
 sit1(a,b);
 printf("has two equal roots:%8.4f/n",x1);
     
    else
      if(disc>1e-6)
     
 sit2(a,b,disc);
 printf("has distinct real roots:%8.4f and %8.4f/n",x1,x2);
     
      else
     
 sit3(a,b,disc);
 printf("has complex roots: /n");
 printf("%8.4f/n",x1);
 printf("%8.4f/n",x2);
     
 

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