62 lines
1.8 KiB
C++
62 lines
1.8 KiB
C++
/*
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时间:2016.2.2
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题号:VJ P1010
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方法：重载运算符，注意小数点的操作
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*/
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#include<iostream>
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#include<cstring>
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using namespace std;
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const int N = 250 * 6;
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char ans[11][N];
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class A
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{ public:
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A operator*(A &b); //重载运算符
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int get(); //将字符串转化为整数数组。
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void print(int n); //将结果保存到字符串ans
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private:
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int num[N] = {0}, len, point;
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};
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int A::get()
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{ char c[7]; int i; bool flag = false;
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if(!(cin >> c)) return 0;
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len = strlen(c) - 1;
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for(i = 0;i < len;i++) {
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if(c[i] != '.' && !flag) num[len-i-1] = c[i] - '0';
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if(c[i] == '.'){ flag = true;point = len - i; }
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if(flag) num[len-i-1] = c[i+1] - '0'; }
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return 1;
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}
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A A::operator*(A &b)
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{ int i, j, k = 0;
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A res;
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for(i = 0;i < len;i++) {
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for(j = 0;j < b.len;j++) {
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res.num[i+j] = res.num[i+j] + num[i] * b.num[j] + k;
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k = res.num[i+j] / 10;res.num[i+j] %= 10; }
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if(k != 0) res.num[i+j] = k;k = 0;
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}
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res.len = len + b.len;
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while(res.num[res.len] == 0 && res.len > point+b.point) res.len--;
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res.len++;res.point = point + b.point;
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return res;
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}
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void A::print(int n)
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{ int i = len - 1, j = 0, k = 0; bool flag = false;
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while(num[j] == 0 && j < point) j++;
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if(num[len-1] == 0 && j == i) { ans[n][k] = 0 + '0';return ; }
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if(i == point && num[i] == 0){ ans[n][k] = '.';k++;i--;flag = true; }
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for(;i >= j;i--)
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if(i == point - 1 && !flag)
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{ ans[n][k] = '.';k++;ans[n][k] = num[i] + '0';k++; }
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else { ans[n][k] = num[i] + '0';k++; }
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}
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int main()
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{ int n, j = 0; A a;
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while(a.get() && cin >> n)
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{ A b = a;
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for(int i = 0;i < n-1;i++) b = a * b;
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b.print(j);j++; }
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for(int i = 0;i < j;i++) cout << ans[i] << endl;
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return 0;
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}
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