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Top Forums Shell Programming and Scripting gcd.sh script doesn't work... Post 302159418 by kantze on Thursday 17th of January 2008 06:55:18 PM
Old 01-17-2008
gcd.sh script doesn't work...

Hi there. I'm new to scripting in bash shell and I have this problem.
I'm trying to make a script that returns the greatest common divisor of two integer numbers according to Euclid's algorithm...

Here is, what I've done:
Code:
#!/bin/bash

m=$1
n=$2

while [ "$n" != 0 ]
do
if [ "$m" -gt "$n" ]; #line 8
then m=$m-$n
else n=$n-$m
fi
done
echo $n

and I get an error message: line 8:integer exrpession expected
I run the gcd.sh writing in the terminal
Code:
./gcd.sh 14 28

where 14 and 28 are integers, right?
So, what's the problem? Could you please tell me what should I write?
 

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MP(3X)																	    MP(3X)

NAME
itom, madd, msub, mult, mdiv, min, mout, pow, gcd, rpow - multiple precision integer arithmetic SYNOPSIS
typedef struct { int len; short *val; } mint; madd(a, b, c) msub(a, b, c) mult(a, b, c) mdiv(a, b, q, r) min(a) mout(a) pow(a, b, m, c) gcd(a, b, c) rpow(a, b, c) msqrt(a, b, r) mint *a, *b, *c, *m, *q, *r; sdiv(a, n, q, r) mint *a, *q; short *r; mint *itom(n) DESCRIPTION
These routines perform arithmetic on integers of arbitrary length. The integers are stored using the defined type mint. Pointers to a mint should be initialized using the function itom, which sets the initial value to n. After that space is managed automatically by the routines. madd, msub, mult, assign to their third arguments the sum, difference, and product, respectively, of their first two arguments. mdiv assigns the quotient and remainder, respectively, to its third and fourth arguments. sdiv is like mdiv except that the divisor is an ordi- nary integer. msqrt produces the square root and remainder of its first argument. rpow calculates a raised to the power b, while pow cal- culates this reduced modulo m. min andmout do decimal input and output. The functions are obtained with the loader option -lmp. DIAGNOSTICS
Illegal operations and running out of memory produce messages and core images. MP(3X)
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