#include<stdio.h> #include<math.h> void m(float a,float b,float c) { double x1,x2; x1=(-b-sqrt(b*b-4*a*c))/(2*a); x2=(-b+sqrt(b*b-4*a*c))/(2*a); printf("方程组有两个实根:x1=%2.2f,x2=%2.2f\n",x1,x2); } void m1(float a,float b,float c) { double x; x=(-b)/2*a; printf("方程有一个实根:x1=x2=%2.2f",x); } void main() { float a,b,c; double sum; printf("请输入a,b,c系数:"); scanf("%f%f%f",&a,&b,&c); printf("方程为:%2.2fx^2+%2.2fx+%2.2f=0\n",a,b,c); sum=b*b-4*a*c; if(sum>0) m(a,b,c); else if(sum==0) m1(a,b,c); else printf("方程无解!!!\n"); }
运行结果: