从ACM编程竞赛档案中搜索并找到了椰子计划的解决方案: 它有一个转到它 - 我该如何消除这个?是否有一个模板或程序要遵循这样做。 感谢
/*
1997 East-Central ACM regional programming contest
Held on November 8, 1997
Coconuts, Revisited -- Problem 3
Sample solution by Ed Karrels, Ed@tool.com
November 1997
*/
#include <stdio.h>
/* return 1 if this number of coconuts can be divided up
properly between this number of people */
int SplitCoco(long n_coco, long n_people) {
long i;
for (i=0; i<n_people; i++) {
/* check that the coconuts divide by the number of people
plus one remainder */
if (n_coco % n_people != 1) return 0;
/* remove 1 for the monkey, and one person's share */
n_coco = n_coco - 1 - (n_coco / n_people);
}
/* check that the remaining coconuts divide evenly among
the people */
return (n_coco % n_people) == 0;
}
int main() {
long n_coco;
long n_people;
long i, j, k;
FILE *inf = stdin;
while (fscanf(inf, "%ld", &n_coco), n_coco!=-1) {
/* starting at the # of coconuts-1, count down until
a number of people is found that works */
for (n_people=n_coco-1; n_people > 1; n_people--) {
if (SplitCoco(n_coco, n_people)) {
printf("%ld coconuts, %ld people and 1 monkey\n",
n_coco, n_people);
goto found;
/* OK, so yea, I put a 'goto' in my code :-)
it was quick and it works. I don't do
it often, I swear. */
}
}
/* if no number of people greater than 1 works, there is
no solution */
printf("%ld coconuts, no solution\n", n_coco);
found:
}
return 0;
}
答案 0 :(得分:8)
在您的情况下,您可以制作一个单独的例程来计算while
,并将goto found
替换为return
。
通常,您可以使用标志和一些while循环替换每个goto。这不会使代码更容易阅读。
答案 1 :(得分:4)
替换
goto found;
带
break;
替换
printf("%ld coconuts, no solution\n", n_coco);
使用:
if(n_people <= 1)
printf("%ld coconuts, no solution\n", n_coco);
答案 2 :(得分:1)
另一个答案已经暗示了这一点,但也暗示它不太可读 - 我不同意 - 我觉得它看起来像它意味着什么。不管你喜欢与否,它都应该作为一种可能的解决方案。
我的解决方案需要定义布尔类型。我假设了C99 <stdbool.h>
定义(或C ++编译)
这只是外部while循环的主体:
bool found = false ;
for (n_people=n_coco-1; n_people > 1 && !found; n_people--)
{
found = SplitCoco(n_coco, n_people)
if( found )
{
printf("%ld coconuts, %ld people and 1 monkey\n", n_coco, n_people);
}
}
if( !found )
{
/* if no number of people greater than 1 works, there is no solution */
printf("%ld coconuts, no solution\n", n_coco);
}
在某些情况下,额外的每循环测试可能是禁止的,但我建议在大多数情况下这是无关紧要的。