评论：关于87.53%的数学分析 http://gccfeli.cn/2009/12/87-53-mathematical-analysis.html Wed, 14 Mar 2012 03:06:49 +0000 hourly 1 http://wordpress.org/?v=3.1 由：Feliciahttp://gccfeli.cn/2009/12/87-53-mathematical-analysis.html/comment-page-1#comment-812 Felicia Fri, 19 Feb 2010 07:59:57 +0000 http://gccfeli.cn/2009/12/%e5%85%b3%e4%ba%8e87-53%e7%9a%84%e6%95%b0%e5%ad%a6%e5%88%86%e6%9e%90.html#comment-812 随手写了个，没考虑时间效率，sorry 随手写了个，没考虑时间效率，sorry

]]> 由：ff8885bhttp://gccfeli.cn/2009/12/87-53-mathematical-analysis.html/comment-page-1#comment-808 ff8885b Wed, 10 Feb 2010 10:05:59 +0000 http://gccfeli.cn/2009/12/%e5%85%b3%e4%ba%8e87-53%e7%9a%84%e6%95%b0%e5%ad%a6%e5%88%86%e6%9e%90.html#comment-808 为什么要用两层循环啊？明明可以O(2n)的情况下解决啊，干嘛用O（n*n）啊 #include #include int main() { char t[10]; int sample_size, cnt = 0; printf("Please enter a percentage with two decimal places (like 87.53), I will help you deside how it is calculated: "); scanf("%s", t); printf("Please enter the sample size: "); scanf("%d", &sample_size); for (int i = 0; i <= sample_size; ++i) { char s[10]; int j; j=i*atof(t); sprintf(s, "%.2lf", j * 100.0 / i); if (strcmp(s, t) == 0) { printf("%d/%d = %lf%%\n", j, i, j * 100.0 / i); ++cnt; } j=i*atof(t)+1; sprintf(s, "%.2lf", j * 100.0 / i); if (strcmp(s, t) == 0) { printf("%d/%d = %lf%%\n", j, i, j * 100.0 / i); ++cnt; } } printf("Total possibilities = %d\n", cnt); return 0; } 为什么要用两层循环啊？明明可以O(2n)的情况下解决啊，干嘛用O（n*n）啊
#include
#include

int main() {
char t[10];
int sample_size, cnt = 0;
printf(“Please enter a percentage with two decimal places (like 87.53), I will help you deside how it is calculated: “);
scanf(“%s”, t);

printf(“Please enter the sample size: “);
scanf(“%d”, &sample_size);

for (int i = 0; i <= sample_size; ++i) {
char s[10];
int j;
j=i*atof(t);
sprintf(s, "%.2lf", j * 100.0 / i);
if (strcmp(s, t) == 0) {
printf("%d/%d = %lf%%\n", j, i, j * 100.0 / i);
++cnt;
}
j=i*atof(t)+1;
sprintf(s, "%.2lf", j * 100.0 / i);
if (strcmp(s, t) == 0) {
printf("%d/%d = %lf%%\n", j, i, j * 100.0 / i);
++cnt;
}
}
printf("Total possibilities = %d\n", cnt);
return 0;
}

]]> 由：Feliciahttp://gccfeli.cn/2009/12/87-53-mathematical-analysis.html/comment-page-1#comment-791 Felicia Mon, 21 Dec 2009 09:28:56 +0000 http://gccfeli.cn/2009/12/%e5%85%b3%e4%ba%8e87-53%e7%9a%84%e6%95%b0%e5%ad%a6%e5%88%86%e6%9e%90.html#comment-791 晕……果然有漏洞。多谢提醒 晕……果然有漏洞。多谢提醒

]]> 由：felix021http://gccfeli.cn/2009/12/87-53-mathematical-analysis.html/comment-page-1#comment-786 felix021 Thu, 17 Dec 2009 11:25:18 +0000 http://gccfeli.cn/2009/12/%e5%85%b3%e4%ba%8e87-53%e7%9a%84%e6%95%b0%e5%ad%a6%e5%88%86%e6%9e%90.html#comment-786 int t[10]; <-- 溢出攻击你的代码，哇哈哈scanf("%10s", t); <-- 这么写～。～ int t[10]; <– 溢出攻击你的代码，哇哈哈

scanf("%10s", t); <– 这么写～。～

]]> 由：jjymhkx0820http://gccfeli.cn/2009/12/87-53-mathematical-analysis.html/comment-page-1#comment-784 jjymhkx0820 Thu, 17 Dec 2009 09:17:45 +0000 http://gccfeli.cn/2009/12/%e5%85%b3%e4%ba%8e87-53%e7%9a%84%e6%95%b0%e5%ad%a6%e5%88%86%e6%9e%90.html#comment-784 这个好牛哈，哈哈。 这个好牛哈，哈哈。

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