程序运行后undefined reference to `al_'出错
程序运行后出错：/usr/bin/ld: /tmp/ccz6HngJ.o: in function `MAIN__':
main.f95:(.text+0x244): undefined reference to `al_'
collect2: error: ld returned 1 exit status
如何排出？！盼复！ 谢谢
贴程序。不然谁知道啥问题。 收到，谢谢！回复如下：
附部分程序，足够了解问题所在吗？
Dimension a(100), a1(101), c(101), d(2), q(98)
Write (*, 3)
Read (*, *) n
np1 = n + 1
Write (*, 5)
Do i = 1, np1
Read (*, *) a1(i)
End Do
Do i = 1, n
a(i) = a1(i+1)/al(1)
End Do
。。。。。。。
3 Format (1X, 'Enter the order of the polynomial')
5 Format (1X, 'Enter the coefficients of the polynomial starting',&
' from the highest order'/5X, ' and press Enter key after ', &
'entering each number.')
10 Format (1X, 'Enter the initial guesses of d(l) and d(2)', &
'and Epsilon, e.g.,.005,.005,.00001:')
11 Format (1X, 'The Roots are :'//'REAL PART IMAGINARY', &
'PART ITERATIONS')
170 Format (F17.5, F18.5, 7X, I7)
298 Format (/5X, 'Denominator is zero.!')
352 Format (/5X, 'The process is not converging!')
368 Format (/5X, 'The process is slow in converging!')
382 Format (/5X, 'Iteration is terminated after 200 trials.')
390 End Program
**********************上面是程序的开始和结束部分，
输入：Standard Input:
3
1
2
3
4
***********
输出：
Compilation failed due to following error(s)./usr/bin/ld: /tmp/ccHVF472.o: in function `MAIN__':
main.f95:(.text+0x244): undefined reference to `al_'
collect2: error: ld returned 1 exit status
:-@
啊， 我自己也认真地看了一下， 确实纠错问题1： Al=A1，（要看清楚 l 和 1 的差别， 容易混淆）。问题2： 程序要求输入， 一定按程序编制的要求， 这里：Input:
5
1
2
3
4
6
9
0.005,0.005,0.00001
输出结果为，Output：
$gfortran -std=f95 *.f95 -o main
$main
Enter the order of the polynomial
Enter the coefficients of the polynomial starting from the highest order
and press Enter key after entering each number.
Enter the initial guesses of d(l) and d(2)and Epsilon, e.g.,.005,.005,.00001:
The Roots are :
REAL PART IMAGINARYPART ITERATIONS
0.68234 1.29869 18
0.68234 -1.29869 18
-0.88316 1.35512 7
-0.88316 -1.35512 7
-1.59836 0.00000 1
****************
该程序为算法， Bairstow方法求多项式的所有根（包括实数和复数）
问题解决
谢谢
implicit none 是如此重要
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