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Tip revision: 22cf34795534220f1bf47013e4a7f0a5502ba3fb authored by cvs2svn on 26 November 1997, 21:20:51 UTC
This commit was manufactured by cvs2svn to create tag 'r15b1'.
Tip revision: 22cf347
test_pow.py
import sys
import test_support

def powtest(type):
    if (type!=float): 
        print "    Testing 2-argument pow() function..."
        for i in range(-1000, 1000):
            if (pow(type(i),0)!=1): 
                raise ValueError, 'pow('+str(i)+',0) != 1'
            if (pow(type(i),1)!=type(i)):
                raise ValueError, 'pow('+str(i)+',1) != '+str(i)
            if (pow(type(0),1)!=type(0)):
                raise ValueError, 'pow(0,'+str(i)+') != 0'
            if (pow(type(1),1)!=type(1)):
                raise ValueError, 'pow(1,'+str(i)+') != 1'
	    
        for i in range(-100, 100):
            if (pow(type(i),3)!=i*i*i):
                raise ValueError, 'pow('+str(i)+',3) != '+str(i*i*i)
    
        pow2=1
        for i in range(0,31):
    	    if (pow(2,i)!=pow2):
                raise ValueError, 'pow(2,'+str(i)+') != '+str(pow2)
    	    if (i!=30): pow2=pow2*2

    print "    Testing 3-argument pow() function..."
    il, ih = -20, 20
    jl, jh = -5,   5
    kl, kh = -10, 10
    compare = cmp
    if (type==float):
        il=1
	compare = test_support.fcmp
    elif (type==int):
        jl=0
    elif (type==long):
        jl,jh = 0, 15
    for i in range(il, ih+1):
         for j in range(jl,jh+1):
             for k in range(kl, kh+1):
      	         if (k!=0):
		     if compare(pow(type(i),j,k), pow(type(i),j)% type(k)):
                         raise ValueError, "pow(" +str(i)+ "," +str(j)+ \
			      "," +str(k)+ ") != pow(" +str(i)+ "," + \
			      str(j)+ ") % " +str(k)


print 'Testing integer mode...'
powtest(int)
print 'Testing long integer mode...'
powtest(long)
print 'Testing floating point mode...'
powtest(float)

# Other tests-- not very systematic

print 'The number in both columns should match.'
print pow(3,3) % 8, pow(3,3,8)
print pow(3,3) % -8, pow(3,3,-8)
print pow(3,2) % -2, pow(3,2,-2)
print pow(-3,3) % 8, pow(-3,3,8)
print pow(-3,3) % -8, pow(-3,3,-8)
print pow(5,2) % -8, pow(5,2,-8)
print

print pow(3L,3L) % 8, pow(3L,3L,8)
print pow(3L,3L) % -8, pow(3L,3L,-8)
print pow(3L,2) % -2, pow(3L,2,-2)
print pow(-3L,3L) % 8, pow(-3L,3L,8)
print pow(-3L,3L) % -8, pow(-3L,3L,-8)
print pow(5L,2) % -8, pow(5L,2,-8)
print

print pow(3.0,3.0) % 8, pow(3.0,3.0,8)
print pow(3.0,3.0) % -8, pow(3.0,3.0,-8)
print pow(3.0,2) % -2, pow(3.0,2,-2)
print pow(5.0,2) % -8, pow(5.0,2,-8)
print

for i in range(-10, 11):
 for j in range(0, 6):
  for k in range(-7, 11):
   if (j>=0 and k!=0):
    o=pow(i,j) % k
    n=pow(i,j,k)
    if (o!=n): print 'Integer mismatch:', i,j,k
   if (j>=0 and k<>0):
    o=pow(long(i),j) % k
    n=pow(long(i),j,k)
    if (o!=n): print 'Long mismatch:', i,j,k
   if (i>=0 and k<>0):
     o=pow(float(i),j) % k
     n=pow(float(i),j,k)
     if (o!=n): print 'Float mismatch:', i,j,k
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