第1个回答 2020-06-19
C++源程序如下:
#include
<iostream>
#include
<math.h>
using
namespace
std;
void
main()
{
float
a,
b,
c,
x1,
x2;
cout
<<
"请输入a,
b,
c的值:";
cin>>
a
>>
b
>>
c;
if
(b*b
-
4*a*c
<=
0)
cout
<<
"输入的系数不对,b2-4ac不大于0!程序退出!"
<<
endl;
else
{
x1
=
(-b
+
sqrt(b*b
-
4*a*c))/2*a;
x2
=
(-b
-
sqrt(b*b
-
4*a*c))/2*a;
cout.precision(2);
cout
<<
"x1
=
"
<<
fixed
<<
x1
<<
endl;
cout
<<
"x2
=
"
<<
fixed
<<
x2
<<
endl;
}
}
C语言源程序如下:
#include
<stdio.h>
#include
<math.h>
void
main()
{
float
a,
b,
c,
x1,
x2;
printf("请输入a,
b,
c的值:");
scanf("%f%f%f",
&a,
&b,
&c);
if
(b*b
-
4*a*c
<=
0)
printf("输入的系数不对,b2-4ac不大于0!程序退出!\n");
else
{
x1
=
(-b
+
sqrt(b*b
-
4*a*c))/2*a;
x2
=
(-b
-
sqrt(b*b
-
4*a*c))/2*a;
printf("x1
=
%.2f\n",
x1);
printf("x2
=
%.2f\n",
x2);
}
}