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| # include <stdio.h>
# include <math.h>
double function1(double a,double b,double c);
double function2(double a,double b,double c);
int judge(double a);
double jdelta(double a,double b,double c);
int main (void)
{
double a,b,c,delta;
printf("一元二次方程计算器:\n");
printf("input a:");
scanf("%lf",&a);
printf("input b:");
scanf("%lf",&b);
printf("input c:");
scanf("%lf",&c);
if ( judge(a) )
{
printf("error!");
}
else
{
delta = jdelta(a,b,c);
printf("dleta=%f\n",delta);
if (delta>0)
{
printf("方程有两个不等实根：");
function1(a,b,c);
}
else if (delta==0)
{
printf("方程有两个相等实根：");
function1(a,b,c);
}
else
{
printf("方程有两个复数根：");
function2(a,b,c);
}
}
return 0;
}
double function1(double a,double b,double c)
{
double x1,x2,delta;
delta = b*b - 4*a*c;
x1 = (-b + sqrt(delta))/(2*a);
x2 = (-b - sqrt(delta))/(2*a);
printf("x1=%.2lf,",x1);
printf("x2=%.2lf\n",x2);
return 0;
}
double function2(double a,double b,double c)
{
double x1,x2,delta;
delta = -(b*b - 4*a*c);
x1 = -(b/(2*a))+sqrt(delta)/(2*a);
x2 = -(b/(2*a))-sqrt(delta)/(2*a);
printf("x1=%.2lfi,",x1);
printf("x2=%.2lfi\n",x2);
return 0;
}
int judge (double a)
{
if (a==0)
return 1;
else
return 0;
}
double jdelta (double a,double b,double c)
{
double delta;
delta = b*b - 4*a*c;
return delta;
}
|
