fact | 易学教程

Python调用C/C++的种种方法

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Python调用C/C++的种种方法 2010-12-07 09:59 28433人阅读评论(1) 收藏 Python是解释性语言, 底层就是用c实现的, 所以用python调用C是很容易的, 下面就总结一下各种调用的方法, 给出例子, 所有例子都在ubuntu9.10, python2.6下试过. 1. Python 调用 C (base) 想在python中调用c函数, 如这儿的fact #include <Python.h> int fact(int n) { if (n <= 1) return 1; else return n * fact(n - 1); } PyObject* wrap_fact(PyObject* self, PyObject* args) { int n, result; if (! PyArg_ParseTuple(args, "i:fact", &n)) return NULL; result = fact(n); return Py_BuildValue("i", result); } static PyMethodDef exampleMethods[] = { {"fact", wrap_fact, METH_VARARGS, "Caculate N!"}, {NULL, NULL} }; void initexample() {

、编写函数 fact(int n) 实现求 n！，在主函数中输入 m 和 n，调用 fact( )函数求 )!(! ! kmk m Cp k m − == 的值

阅读更多关于、编写函数 fact(int n) 实现求 n！，在主函数中输入 m 和 n，调用 fact( )函数求 )!(! ! kmk m Cp k m − == 的值

【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 编写函数 fact(int n) 实现求 n！，在主函数中输入 m 和 n，调用 fact( )函数求 )!(! ! kmk m Cp k m − == 的值 #include<stdio.h> int fact(int n); int main() { int m,k;//m>k float p; printf("输入m的值:\n"); scanf("%d",&m); printf("输入k的值:\n"); scanf("%d",&k); p=fact(m)/(fact(k)*fact(m-k)); printf("P=%.2f",p); return 0; } int fact(int n) { int i,y=1; if(n<=1){ y=1; }else{ for(i=1;i<=n;i++){ y*=i; } } return y; } 来源： oschina 链接： https://my.oschina.net/u/4227963/blog/3146676

How to print all the facts?

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问题 I am stuck for this problem... isAt(keys, room3). isAt(book, room3). isAt(keys, room6). isAt(keys, room4). currently, room3 have keys and book. I want to print keys and book. I tried this code and apparently prints only one. (just keys) look :- isIn(Location), write('You are in '), write(Location), nl, items_inroom(Location), nl. items_inroom(Location) :- isIn(Location), isAt(Item, Location), write('Available Item(s):'), write(Item), nl. items_inroom(_) :- write('Available Item(s): None'), nl

drools programmatically generate a fact model

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问题 I need to generate an enormous fact model using an ontology external to drools. Now, I could certainly write a script/program to pull this off. My approach would be to generate a java bean for each ontology class which contains the appropriate fields, methods, and references to other java objects based on ontological relationships (probably in a map). My question is whether drools has a more elegant way to approach this problem. I figure it must be a common problem that the fact model is

drools programmatically generate a fact model

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Using a list from a fact within Prolog rules

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问题 I am currently writing a rail line program but am having a little trouble using lists that come from facts. I am quite new to Prolog and so far have written the following facts and rules: location(euston, [northernLine]). location(warrenStreet, [victoriaLine, northernLine]). location(warwickAvenue, [bakerlooLine]). location(paddington, [bakerlooLine]). hasCommonLine(Location1, Location2, Line) :- location(Location1, Line), location(Location2, Line). The idea is for the rule to return the name

C / Find 190! (factorial) in c programming

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问题 I try to find 190! in C . I define my variable to long double, but I see that it calculate (correctly) only to 172!: After that, I got #INF00000 ...` There is any way to do it? 回答1: It's really just a few lines of code to implement enough of a bigint implementation to compute factorials. Here's code that prints the first 200 factorials. #include <stdio.h> int mult(int n, size_t size, unsigned char *data) { int carry = 0; for (int i = 0; i < size; i++) { int result = data[i] * n + carry; data

Prolog - Little exercise on facts

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问题 Ok. That's my problem. I need to implement a predicate that sums up all the prices of the products in the list. But, for now, I'm not getting any further with it. What am I doing wrong? Thanks in advance. domains state = reduced ; normal database producte (string, integer, state) predicates nondeterm calculate(integer) clauses % ---> producte( description , price , state ) producte("Enciam",2,normal). producte("Llet",1,reduced). producte("Formatge",5,normal). calculate(Import):- producte(_

How to dynamically reload rules using already declared fact types?

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问题 I am facing an issue while trying to reload rules dynamically. Starting with the context : we have DRLs files which contains a total of 10000 rules, and various types. As the process of compiling and redeploying rules is starting to be long (over than a couple of minutes), we would like to compile & redeploy ONLY the modified rule. To be DRL-compliant, we have to declare in the DRL to redeploy the modified rule, AND all used types. Our problem is that types declared in the new DRL are not

How to model process and status history in a data warehouse?

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问题 Let's say that we have D_PROCESS , D_WORKER and D_STATUS as dimensions, and the fact F_EVENT that links a process (what) with a worker (who's in charge) and the "current" status. The process status changes over time. Shoud we store in F_EVENT one line per process/status/worker, or one line per process/worker, and "somewhere else" one line per status change for a given process/worker? I'm new to Datawarehouse and it's hard to find best practices/tutorial related to data modelization. 回答1: Read