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gplibt02
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tfix.cc
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C/C++ Source or Header
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1993-07-24
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3KB
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110 lines
//
// testFix.cc : test Fix (variable length) classes
//
#include <xfix.h>
overload check;
overload checkb;
void check(const char* x, Fix y)
{
cout << x << " = " << (y) << "\n";
}
void check(const char* x, int y)
{
cout << x << " = " << (y) << "\n";
}
void check(const char* x, double y)
{
cout << x << " = " << (y) << "\n";
}
void checkb(const char* x, Fix y)
{
cout << x << " = " << (y) << " [" << length(y) << "]"<< "\n";
}
main() {
cout << "Fix: identities should be displayed\n"
<< "[X] displays the precision of a given value\n"
<< "[*] indicates that the full precision is not used for coding reasons\n";
Fix a; checkb("0 [16]",a);
Fix b = .5; checkb(".5 [16]",b);
Fix c(17,-.5); checkb("-.5 [17]",c);
Fix d(33,.1); checkb(".1 [33]",d);
Fix e = c; checkb("-.5 [17]",e);
checkb(".3 [16]",a = .3);
checkb(".5 [16]",a = b);
checkb(".1 [16]",a = d);
checkb(".1 [33*]",d = a);
checkb("-.2 [17]",c = -.2);
checkb("-.5 [17]",e);
check(".1 [16] == .1 [33*]",a == d);
d = .1;
check(".1 [16] == .1 [33]",a == d);
check(".1 [33] != .5 [16]",d != b);
check(".1 [33] > .5 [16]",d > b);
check(".1 [33] <= -.2 [17]",d <= c);
e = .5;
check("1073741824",mantissa(e));
check(".5",value(e));
checkb(".5 [17]",+e);
checkb("-.5 [17]",-e);
checkb(".1 [33] + .5 [16]",d+b);
checkb(".1 [33] - .5 [16]",d-b);
checkb(".1 [33] * .5 [16]",d*b);
checkb(".1 [33] * 3",d*3);
checkb(".1 [33] * -3",d*-3);
checkb("-.1 [33] * 3",(-d)*3);
checkb("-.1 [33] * -3",(-d)*-3);
checkb(".5 [17] * -2",e*-2);
checkb(".1 [33] % 25",d%25);
checkb(".1 [33] % -25",d%-25);
checkb(".1 [33] / .5 [16]",d/b);
checkb(".1 [33] << 1",d<<1);
checkb("-.1 [33] >> 2",(-d)>>2);
checkb("abs(-.2)",abs(c));
checkb("abs(.2)",abs(-c));
check("sgn(-.2)",sgn(c));
check("sgn(.2)",sgn(-c));
cout << "\nshow .1 [33]\n";
show(d);
Fix g = .95;
cout << "\nFix: range errors warned\n";
Fix f = 1.1; checkb("1.1 [16]",f);
checkb(".5 [16] / .1 [33]",b/d);
checkb(".5 [16] / 0. [16]",b/Fix(0.));
checkb(".5 [17] * 32768",e*32768);
cout << "\nFix: overflows saturated\n";
set_overflow_handler(Fix_overflow_saturate);
checkb(".95 [16] + .1 [33]",g+d);
checkb("-.1 [33] - .95 [16]",-d-g);
checkb(".5 [17] * 2",e*2);
cout << "\nFix: overflows generate warnings\n";
set_overflow_handler(Fix_overflow_warning);
checkb(".95 [16] + .1 [33]",g+d);
checkb("-.1 [33] - .95 [16]",-d-g);
checkb(".5 [17] * 2",e*2);
}