[問題] 陣列大小有上限嗎

看板C_and_CPP作者gw119 (我想出去玩啦)時間15年前 (2009/05/05 23:22)推噓5(5推 0噓 11→)

留言16則, 8人參與討論串1/1

#include<iostream> #include <iomanip> #include <stdio.h> #include <stdlib.h> #include <time.h> #include <conio.h> #include <string.h> #include <fstream> #include <math.h> using std::cout; using std::endl; using namespace std; double unif(double &seed); double norm(double mean, double var); int main(void) { double mean = 0; double SNR =10.0; double var =1/pow(10 , SNR/10); double w[1000][100]={0}; double err = 0; double total = 10000000; int t[1000][100] = {0}; double r[1000][100] = {0}; for(int j=0 ; j<100 ;j++) { for(int i=0 ; i<1000; i++) { t[i][j] = -1; w[i][j] = norm(mean,var); r[i][j] = t[i][j]+w[i][j]; if(r[i][j]>=0) { err+=1; } } } ofstream fop("re.txt"); fop<<(err/total); cout<<"解碼結束"<<endl; fop.close(); system("pause"); }//////end double unif(double &seed) { double a1=3972.0,a2=4094.0; double m=2147483647.0; double seed1,seed2; seed1 = a1 * seed ; seed2 = a2 * seed ; /* control seed < 10^10 */ seed1 = seed1 - (long)(seed1/m) * m ; seed2 = seed2 - (long)(seed2/m) * m ; seed = seed1 * 100000.0 + seed2; seed = seed - (long)(seed/m)*m; if((seed/m)<0){ return(-1*seed/m);} else return(seed/m); } double norm(double mean, double var) { double sz=0.0,v1,v2,sigma,ans; double seed1,seed2; sigma=sqrt(var); seed1=rand()+clock()*123; v1=unif(seed1); seed2=fabs(clock()*1236*var+rand()-seed1); v2=unif(seed2); sz=cos(2.*3.14*v1)*sqrt(-2.*log(v2)); ans=sz*sigma+mean; return(ans); } 我想請教的問題是當我把w[1000][100]裡面的1000改成10000然後其它像 t[][]還有r[][]跟i都改成對應的10000後，程式就出現overflow的訊息這是因為我設定超過陣列的上限嗎，因為像1000就可以執行但改成 10000就不能，請問板上的高手這是甚麼問題呢，感謝^^ -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.113.122.235

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BSpowerx

05/05 23:25, , 1^F

05/05 23:25, 1^F

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VictorTom

05/05 23:37, , 2^F

05/05 23:37, 2^F

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VictorTom

05/05 23:38, , 3^F

05/05 23:38, 3^F