電腦上自帶的計(jì)算器在計(jì)算結(jié)果數(shù)值較小的運(yùn)算時(shí)較為精確，比如乘法，結(jié)果通常不能大于2的64次方，這里給出高精度乘法的源代碼：
#include<iostream>#include<string>using namespace std;void JinWei(int *Result, int length);int main(){ string a, b; cout << "請(qǐng)輸入兩個(gè)數(shù)：" << endl; cin >> a >> b; int ResultLength = a.length() + b.length()-1; int *Result = new int[ResultLength]; memset(Result, 0, sizeof(int)*ResultLength); for (int i = a.length()-1; i >=0; i--) { for (int j = b.length()-1; j >=0; j--) { Result[i + j] +=int(a[i]-48) * int(b[j]-48); JinWei(Result, ResultLength); } } cout <<"結(jié)果="; for (int i = 0; i < ResultLength;i++) { cout << Result[i]; } return 0;}void JinWei(int *Result, int length){ for (int _t = length - 1; _t >0; _t--) { if (Result[_t]>9) { Result[_t-1] +=Result[_t]/10; Result[_t] %= 10; } }}新聞熱點(diǎn)
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