161 lines
4.3 KiB
C++
161 lines
4.3 KiB
C++
// BCDTEST.CPP
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#include <stream.hpp>
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#include <bcd.hpp>
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#define nl "\n"
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main()
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{
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int i, n, v = 13;
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bcd bcd24;
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bcd a(1234567890,48); // test constructors
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bcd b("998877665544332211",48);
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bcd c = b;
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long l;
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double x;
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cout << "Result of default initialisation = " << bcd24 << nl;
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cout << "a is " << a << nl; // test output
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cout << "b is " << b << nl;
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cout << "c is " << c << nl;
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c = b = a; // test assignment
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cout << "c is now " << c << nl;
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a = 1; b = v; // more assignments
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cout << "\nPowers of 13\n\n";
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for(;;) {
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a = a * b; // watch multiply perform
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cout << a << nl;
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if (a.state()) // until a overflows
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break;
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}
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cout << "\noverflowed 48 digits\n\nNow divide down largest no by 1357\n\n";
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a = "999999999999999999999999999999999999999999999999";
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b = 1357L;
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x = a;
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cout << x << nl; // see what largest no looks like as a double
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for(;;) {
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a = a / b; // now watch divide
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cout << a << nl;
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if (!a.test()) // until down to zero
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break;
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if (a.state())
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break;
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}
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cout << "\nNow cross zero doing subtractions/additions\n\n";
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a = 10L;
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b = 1L;
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for (i = 20; i--;) { // check that sign behaves ok
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a = a - b;
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cout << a << nl;
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}
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for (i = 20; i--;) {
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a = a + b;
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cout << a << nl;
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}
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cout << "\nNow overflow doing increments\n\n";
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a = "999999999999999999999999999999999999999999999990";
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for (i = 20; i--;) {
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a++;
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cout << a << nl;
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if (a.state())
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break;
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}
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cout << "Negative Powers of 13 \n\n";
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a = 1L;
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b = -13L;
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for(;;) {
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a = a * b;
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cout << a << nl;
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if (a.state())
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break;
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}
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cout << "\noverflowed 48 digits\n\nNow divide down largest negative no by 1357\n\n";
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a = "-999999999999999999999999999999999999999999999999";
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cout << a << nl;
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b = 1357L;
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for(;;) {
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a = a / b;
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cout << a << nl;
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if (!a.test())
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break;
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if (a.state())
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break;
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}
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cout << "\nNow underflow doing subtractions\n\n";
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a = "-999999999999999999999999999999999999999999999990";
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b = 1L;
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for (i = 20; i--;) {
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a = a - b;
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cout << a << nl;
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if (a.state())
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break;
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}
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cout << "\n\nDo it all again using alternative forms\n\n";
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cout << "Powers of 13 \n\n";
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a = 1L;
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for(;;) {
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a = a * 13L;
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cout << a << nl;
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if (a.state())
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break;
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}
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cout << "\noverflowed 48 digits\n\nNow divide down largest no by 1357\n\n";
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a = "999999999999999999999999999999999999999999999999";
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cout << a << nl;
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for(;;) {
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a = a / 1357L;
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cout << a << nl;
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if (!a.test())
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break;
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if (a.state())
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break;
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}
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cout << "\nNow cross zero doing subtractions/additions\n\n";
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a = 10L;
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for (i = 20; i--;) {
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a--;
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cout << a << nl;
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}
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for (i = 20; i--;) {
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a++;
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cout << a << nl;
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}
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cout << "\nNow overflow doing additions\n\n";
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a = "999999999999999999999999999999999999999999999990";
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for (i = 20; i--;) {
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a++;
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cout << a << nl;
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if (a.state())
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break;
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}
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cout << "Negative Powers of 13 \n\n";
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a = 1L;
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for(;;) {
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a = a * -13L;
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cout << a << nl;
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if (a.state())
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break;
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}
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cout << "\noverflowed 48 digits\n\nNow divide down largest negative no by 1357\n\n";
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a = "-999999999999999999999999999999999999999999999999";
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for(;;) {
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a = a / 1357L;
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cout << a << nl;
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if (!a.test())
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break;
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if (a.state())
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break;
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}
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cout << "\nNow overflow doing subtractions\n\n";
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a = "-999999999999999999999999999999999999999999999990";
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for (i = 20; i--;) {
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a--;
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cout << a << nl;
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if (a.state())
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break;
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}
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a = "123456789000000000000000000000000123456789";
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x = a;
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cout << x << nl;
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}
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