求一元二次方程的根

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#include<stdio.h>#include<math.h>int main(){void t1(int a,int b,int c);void t2(int a,int b,int c);void t3(int a,int b,int c);int a,b,c,delta;double ans0,ans1,sqrt_delta,realpart,imagpart;printf("Please input a b c:\n");scanf("%d %d %d",&a,&b,&c);printf("Output:\n");if(a==0){printf("not a quadratic\n");}else{delta=b*b-4*a*c;if(delta>0){t1(a,b,c);}else if(delta==0){t2(a,b,c);}else{t3(a,b,c);}}return 0;}void t1(int a,int b,int c){int delta;double sqrt_delta,ans0,ans1;delta=b*b-4*a*c;sqrt_delta=sqrt(delta);ans0=(-b-sqrt_delta)/(2.0*a);ans1=(-b+sqrt_delta)/(2.0*a);printf("distinct real roots:\n%.4f %.4f\n",ans0,ans1);}void t2(int a,int b,int c){double ans0;ans0=(-b)/(2.0*a);printf("two equal roots:\n%.4f\n",ans0);}void t3(int a,int b,int c){int delta;double realpart,imagpart;delta=b*b-4*a*c;realpart=(-b)/(2.0*a);imagpart=sqrt(-delta)/(2.0*a);printf("complex roots:\n%.4f+%.4fi %.4f+%.4fi\n",realpart,imagpart,realpart,imagpart);}

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