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4.4.cpp
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58 lines (50 loc) · 1.84 KB
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/*
* 题目名称：浮点数加法
* 题目来源：北京大学复试上机题
* 题目链接：http://t.cn/Ai8I4v0j
* 代码作者：杨泽邦(炉灰)
*/
#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
string Add(string str1, string str2) {
string fractional1 = str1.substr(str1.find('.') + 1);
string fractional2 = str2.substr(str2.find('.') + 1);
if (fractional1.size() < fractional2.size()) { //小数对齐
fractional1 = fractional1 + string(fractional2.size() - fractional1.size(), '0');
} else {
fractional2 = fractional2 + string(fractional1.size() - fractional2.size(), '0');
}
string integral1 = str1.substr(0, str1.find('.'));
string integral2 = str2.substr(0, str2.find('.'));
if (integral1.size() < integral2.size()) { //整数对齐
integral1 = string(integral2.size() - integral1.size(), '0') + integral1;
} else {
integral2 = string(integral1.size() - integral2.size(), '0') + integral2;
}
int carry = 0;
string fractional(fractional1.size(), ' ');
for (int i = fractional.size() - 1; i >= 0; --i) { //小数相加
int current = fractional1[i] - '0' + fractional2[i] - '0' + carry;
fractional[i] = current % 10 + '0';
carry = current / 10;
}
string integral(integral1.size(), ' ');
for (int i = integral.size() - 1; i >= 0; --i) { //整数相加
int current = integral1[i] - '0' + integral2[i] - '0' + carry;
integral[i] = current % 10 + '0';
carry = current / 10;
}
if (carry != 0) {
integral = to_string(carry) + integral;
}
return integral + '.' + fractional;
}
int main() {
string str1, str2;
while (cin >> str1 >> str2) {
cout << Add(str1, str2) << endl;
}
return 0;
}