/** timer.cpp** Created on: 2014年12月28日* Author: judyge*/#include<cstring> #include<iomanip> #include<algorithm> #include<cstdlib> #include<cstdio> #include<iostream> #include<vector> #include<stdio.h> #include<time.h> #include<windows.h> #define MAXN 9999 #define MAXSIZE 1000 #define DLEN 4using namespace std;class BigNum{private:int a[500]; //可以控制大數的位數int len; //大數長度public:BigNum(){ len = 1;memset(a,0,sizeof(a)); } //構造函數BigNum(const int);friend ostream& operator<<(ostream&, BigNum&);BigNum operator+(const BigNum &) const;void print();};BigNum::BigNum(const int b) //將一個int類型的變量轉化為大數{int c,d = b;len = 0;memset(a,0,sizeof(a));while(d > MAXN){c = d - (d / (MAXN + 1)) * (MAXN + 1);d = d / (MAXN + 1);a[len++] = c;}a[len++] = d;}ostream& operator<<(ostream& out, BigNum& b) //重載輸出運算符{int i;cout << b.a[b.len - 1];for(i = b.len - 2 ; i >= 0 ; i--){cout.width(DLEN);cout.fill('0');cout << b.a[i];}return out;}BigNum BigNum::operator+(const BigNum & T) const //兩個大數之間的相加運算{BigNum t(*this);int i,big; //位數big = T.len > len ? T.len : len;for(i = 0 ; i < big ; i++){t.a[i] +=T.a[i];if(t.a[i] > MAXN){t.a[i + 1]++;t.a[i] -=MAXN+1;}}if(t.a[big] != 0)t.len = big + 1;elset.len = big;return t;}void BigNum::print() //輸出大數{int i;cout << a[len - 1];for(i = len - 2 ; i >= 0 ; i--){cout.width(DLEN);cout.fill('0');cout << a[i];}cout << endl;}int main(){clock_t start,finish; double time; start=clock();int i; BigNum sum(0); for(i=0;i<=65535179;i++) {BigNum tmp(i);sum=sum+tmp; } cout<<sum<<'\n';finish=clock(); time=(double)((finish-start)/CLOCKS_PER_SEC); printf("start:%ld\t\tfinish:%ld\tfinish-start:%ld\truntime:%f\n",start,finish,finish-start,time); return 0;}
運行結果

2147429876048610 start:1 finish:37218 finish-start:37217 runtime:37.000000

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