C语言 如何计算while循环执行的次数
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How to count the number of times a while loop is executed
提问by user1975158
In C, how do you count the number of times a whileloop is executed?
在 C 中，如何计算while循环执行的次数？
In Python, I'd just create an empty list in the beginning and append the values from the whileloop every time the loop is executed. I'd then find the length of that list to know how many times that whileloop was executed. Is there a similar method in C?
在 Python 中，我只是在开头创建一个空列表，并在while每次执行循环时附加循环中的值。然后我会找到该列表的长度以了解该while循环执行了多少次。C中是否有类似的方法？
回答by Oliver Charlesworth
Initialise a variable to 0, and increment it on every iteration?
将变量初始化为 0，并在每次迭代时递增它？
int num = 0;
while (something) {
num++;
...
}
printf("number of iterations: %d\n", num);
回答by sashkello
initiate i = 0and then i++on every loop pass...
启动i = 0，然后i++在每次循环传递...
回答by Roberto
(Sorry, this is the C++ way, not C...) If you really want to go for the filling list, this is how it could be done:
（抱歉，这是 C++ 的方式，而不是 C...）如果你真的想要去填表，可以这样做：
#include <list>
#include <iostream>
using namespace std;
...
list<int> my_list;
int num = 0;
while( ... ) {
...
++num;
my_list.push_back(num);
}
cout << "List size: " << my_list.size() << endl;
If you want to print the list values:
如果要打印列表值：
#include <list>
#include <iostream>
#include <algorithm>
using namespace std;
...
list<int> my_list;
int num = 0;
while( ... ) {
...
++num;
my_list.push_back(num);
}
cout << "List contens: " << endl;
// this line actually copies the list contents to the standard output
copy( my_list.begin(), my_list.end(), iostream_iterator<int>(cout, ",") );
