Re: [問題] `main' must return 'int'
看板C_and_CPP (C/C++)作者Schottky (Schottky)時間12年前 (2013/09/12 12:37)推噓6(6推 0噓 31→)留言37則, 12人參與討論串2/2 (看更多)
※ 引述《filexchang (嵐逸)》之銘言：
: 如題
: 我需要寫程式計算論文裡的數值(過大)
N
從程式中看起來你是要計算 SUM(N) = Σ C(N,k)
k=1
N
依照二項式定理 SUM(N) = ( Σ C(N,k) ) - 1 = (1+1)^N - 1 = 2^N - 1
k=0
#include <stdio.h>
#include <gmp.h>
int main(void)
{
mpz_t sum;
unsigned long int n = 1088;
mpz_init(sum);
mpz_ui_pow_ui(sum, 2, n);
mpz_sub_ui(sum, sum, 1);
gmp_printf("sum = %Zd\n", sum);
mpz_clear(sum);
return 0;
}
打完收工。
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◆ From: 220.137.38.88
※ 編輯: Schottky 來自: 220.137.38.88 (09/12 12:39)
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