#include#include#includeintJudge(doublea,doubleb,doublec){doubleresult=b*b-4*a*c;if(result==0)return0;elseif(result>0)return1;elsereturn-1;}voidComputeGreatThanZero(doublea,doubleb,doublec){printf("x1=%gf,x2=%gf",(-b+sqrt(b*b-4*a*c))/(2*a),((-b-sqrt(b*b-4*a*c))/(2*a)));}voidComputeEqualZero(doublea,doubleb,doublec){printf("x1=x2=%g",-b/(2*a));}voidComputeBelowZero(doublea,doubleb,doublec){doubledelta=sqrt(4*a*c-b*b);doubletemp=delta/(2*a);printf("x1=%g",-b/(2*a));if(temp>0)printf("+%gi,",temp);elseprintf("-%gi,",fabs(temp));printf("x2=%g",-b/(2*a));if(delta>0)printf("-%gi",fabs(temp));elseprintf("+%gi",fabs(temp));}voidmain(){doublea,b,c;intflag;scanf("%lf%lf%lf",&a,&b,&c);if(a==0){printf("a=0");exit(1);}flag=Judge(a,b,c);if(flag>0)ComputeGreatThanZero(a,b,c);elseif(flag==0)ComputeEqualZero(a,b,c);elseComputeBelowZero(a,b,c);}//zd_44.cpp:Definestheentrypointfortheconsoleapplication.//#include#includefloatx1,x2,disc,p,q;greater_than_zero(floata,floatb){x1=(-b+sqrt(disc))/(2*a);x2=(-b-sqrt(disc))/(2*a);}equal_to_zero(floata,floatb){x1=x2=(-b)/(2*a);}smaller_than_zero(floata,floatb){p=-b/(2*a);q=sqrt(abs(disc))/(2*a);}intmain(intargc,char*argv[]){floata,b,c;printf("Inputa,b,c:");scanf("%f,%f,%f",&a,&b,&c);printf("equation:%5.2f*x*x+%5.2f*x+%5.2f=0",a,b,c);disc=b*b-4*a*c;printf("root:");if(disc>0){greater_than_zero(a,b);printf("x1=%5.2fx2=%5.2f",x1,x2);}elseif(disc==0){equal_to_zero(a,b);printf("x1=%5.2fx2=%5.2f",x1,x2);}else{smaller_than_zero(a,b);printf("x1=%5.2f+%5.2fix2=%5.2f-%f5.2i",p,q,p,q);}printf("HelloWorld!");return0;}运行结果：Inputa,b,c:7,4,3equation:7.00*x*x+4.00*x+3.00=0root:x1=-0.29+0.59ix2=-0.29-0.5890155.2iHelloWorld!Pressanykeytocontinue