今天偶然看了一下某大神的模板,不经意翻到这个就顺便“借”了一下
上代码吧:/*Date : 2015-8-21 晚上Author : ITAKMotto :今日的我要超越昨日的我,明日的我要胜过今日的我;以创作出更好的代码为目标。不断地超越自己。*/#include#include #include using namespace std;/**怎样用:1、变量声明:能够给初值,如:BigInt ans=100; 能够不给初值(默觉得0)。如BigInt ans。2、计算:能够连个BigInt对象相乘,相加;ans+ans*ans; 也能够和整数相乘相加。如:ans+78*ans;*/struct BigInt { const static int mod = 10000; const static int DLEN = 4; int a[600],len; BigInt() { memset(a,0,sizeof(a)); len = 1; } BigInt(int v) { memset(a,0,sizeof(a)); len = 0; do { a[len++] = v%mod; v /= mod; } while(v); } BigInt(const char *s) { memset(a,0,sizeof(a)); int L = strlen(s); len = L/DLEN; if(L%DLEN) len++; int index = 0; for(int i=L-1; i>=0; i-=DLEN) { int t = 0; int k = i-DLEN+1; if(k<0) k = 0; for(int j=k; j<=i; j++) t = t*10+s[j]-'0'; a[index++] = t; } } BigInt operator +(const BigInt &b)const { BigInt res; res.len = max(len,b.len); for(int i=0; i<=res.len; i++) { res.a[i] = 0; } for(int i=0; i
a[i]:0)+((i<b.len)?b.a[i]:0); res.a[i+1] += res.a[i]/mod; res.a[i] %= mod; } if(res.a[res.len]>0) res.len++; return res; } BigInt operator *(const BigInt &b)const { BigInt res; for(int i=0; i<len; i++) { int up = 0; for(int j=0; j<b.len; j++) { int temp = a[i]*b.a[j]+res.a[i+j]+up; res.a[i+j] = temp%mod; up = temp/mod; } if(up != 0) res.a[i+b.len] = up; } res.len = len+b.len; while(res.a[res.len-1]==0 && res.len>1)res.len--; return res; } void output() { printf("%d",a[len-1]); for(int i=len-2; i>=0; i--) printf("%04d",a[i]); printf("\n"); } };