这是我编的,但是要求用变量和局部变量#include <stdio.h>
#include <math.h>
int main(){
double a,b,c;
double m,n,p;
printf("请输入a,b,c:");
scanf("%f%f%f",&a,&b,&c);
printf("\n");
p=b*b-4*a*c;
m=(-b+sqrt(p))/(2*a);
n=(-b-sqrt(p))/(2*a);
printf("m=%f,n=%f\n",m,n);
return 0;
}