Pagwin/cs440-final
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negatives in addition are handled just need to do abs_sub and I'm done with draft

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Pagwin 2024-12-11 16:25:58 -05:00
parent 35efa772f0
commit 255654b284
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1 changed files with 21 additions and 4 deletions
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25
integer.cpp
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@ -95,8 +95,8 @@ public:
} }
return false; return false;
} }
friend Integer &operator+=(Integer &lhs, Integer const &rhs) {
// TODO: negative numbers friend Integer &abs_add(Integer &lhs, Integer const &rhs) {
bool overflow = false; bool overflow = false;
for (std::size_t i = 0; i < std::min(lhs.size, rhs.size); i++) { for (std::size_t i = 0; i < std::min(lhs.size, rhs.size); i++) {
if (std::numeric_limits<byte>::max() - lhs.bytes[i] <= rhs.bytes[i]) { if (std::numeric_limits<byte>::max() - lhs.bytes[i] <= rhs.bytes[i]) {
@ -124,9 +124,26 @@ public:
} }
return lhs; return lhs;
} }
friend Integer &abs_sub(Integer &lhs, Integer const &rhs) { return lhs; }
friend Integer &operator+=(Integer &lhs, Integer const &rhs) {
// TODO: negative numbers
if (lhs.isNegative == rhs.isNegative) {
return abs_add(lhs, rhs);
} else {
if (abs_lt(rhs, lhs)) {
return abs_sub(lhs, rhs);
} else if (abs_lt(lhs, rhs)) {
Integer tmp = std::move(lhs);
lhs = rhs;
return abs_sub(lhs, tmp);
} else {
lhs = 0;
return lhs;
}
}
}
friend Integer &operator-=(Integer &lhs, Integer const &rhs) { friend Integer &operator-=(Integer &lhs, Integer const &rhs) {
todo("-="); return lhs += -rhs;
return lhs;
} }
friend Integer &operator*=(Integer &lhs, Integer const &rhs) { friend Integer &operator*=(Integer &lhs, Integer const &rhs) {
Integer tmp = std::move(lhs); Integer tmp = std::move(lhs);