#include<stdio.h> #include"math.h" void seekroot (float a,float b,float c) { float m,term1,term2; if(a==0) if(b==0) printf("the answer not exist.\n"); else printf("the answer is %f\n",-c/b); else   {   m=b*b-4*a*c;   if(m>0)   { term1=(-b+sqrt(m))/(2*a); term2=(-b-sqrt(m))/(2*a); printf("the root is %f and %f",term1,term2);} else printf("the real root not exsit !\n");    } } main() { float d,e,f; printf("please input three numbers;\n"); scanf("%f%f%f",&d,&e,&f); seekroot(d,e,f);

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