在Fortran中编写一个程序来实现y = 3x - 2的计算,可以通过以下步骤完成:
声明变量
输入x的值
计算y的值
输出y的值
以下是一个简单的Fortran程序示例:
fortranCopy code! y_calculation.f90program y_calculation
implicit none
! 声明变量
real :: x, y
! 输入x的值
print *, "请输入x的值: "
read *, x
! 计算y的值
y = 3.0 * x - 2.0
! 输出y的值
print *, "当x = ", x, "时, y = ", y
end program y_calculation
要乱散编译和运行此程序,请执行以下命令(假设你已经安装了一个哗哗氏Fortran编译器,如GNU Fortran):
bashCopy codegfortran y_calculation.f90 -o y_calculation./y_calculation
这个芦告程序将提示你输入x的值,然后计算并输出y的值。
代码如下灶橘悔, 供参考
program testimplicit none 隐正
integer :: n,i
伍卜 real(8),allocatable :: x(:), y(:), x2(:), xy(:)
real(8) :: xbar,ybar,xbar2,xybar,x2bar,a,b
print*, 'Number of points: '
read(*,*) n
allocate(x(n))
allocate(y(n))
allocate(x2(n))
allocate(xy(n))
do i = 1,n
print*, '(x,y) = '
read(*,*) x(i),y(i)
x2(i) = x(i)**2
xy(i) = x(i)*y(i)
end do
xbar = sum(x) / n
ybar = sum(y) / n
xybar = sum(xy) / n
xbar2 = xbar**2
x2bar = sum(x2) / n
b = ( xybar - xbar*ybar ) / ( x2bar - xbar2 )
a = ybar - b*xbar
print*, 'a = ', a
print*, 'b = ', b
deallocate(x,y,x2,xy)
stop
end program
一个测试:
Number of points:4
(x,y) =
1 2
(x,y) =
2 3
(x,y) =
3 4
(x,y) =
4 5
a = 1.00000000000000
b = 1.00000000000000
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