小编Jon*_*ein的帖子

我不确定我的逻辑中的错误是什么.样本输出:

How many terms of the Fibonacci Sequence do you wish to compute?
1
1
1
--How many terms of the Fibonacci Sequence do you wish to compute?
5
5
5
5
5
5
5

它为什么这样做？

    // Recursive Fibonacci Sequence
#include <iostream>
using namespace std;

double fib(double number);

int main(void) {
        double number;
        cout << "How many terms of the Fibonacci Sequence do you wish to compute?" << endl;
        cin >> number;

        for(int i = 0; i <= number; ++i) …

它总是输出'0'的区域.我无法想象如何在int r计算面积方面工作.

// Define a class and use it to test out some math stuff
#include <iostream>
#include <cmath>
using namespace std;

class Circle {
        public:
                // function that calculates the area of a circle
                float circle_area(int r) {
                        area = 3.14 * (r*r);
                        return area;
                } // end function circle_area
                void display_msg() {
                        cout << "Area: " << circle_area(r) << endl;
                } // end function display_msg
        private:
                float area;
                int r;
}; // end class Circle

int …

此代码直接从Kotlin公开的Wiki中提取，但不起作用。奇怪而令人沮丧的是，我无法实现它，因为我有一个很棒的项目，需要使用RDBMS。我想念什么？坏了吗

import org.jetbrains.exposed.sql.StdOutSqlLogger
import org.jetbrains.exposed.sql.Database
import org.jetbrains.exposed.sql.Table
import org.jetbrains.exposed.sql.insert
import org.jetbrains.exposed.sql.transactions.transaction
import org.jetbrains.exposed.sql.selectAll

fun main(args: Array<String>) {
    Database.connect("jdbc:h2:mem:test", driver = "org.h2.Driver")

    transaction {
        logger.addLogger(StdOutSqlLogger)

        val stPeteId = Cities.insert {
            it[name] = "St. Petersburg"
        } get Cities.id

        println("Cities: ${Cities.selectAll()}")
    }
}

// Table definition
object Cities : Table() {
    val id = integer("id").autoIncrement().primaryKey()
    val name = varchar("name", 50)
}
// Entity definition
data class City(
        val id: Int,
        val name: String
)

在Intellij中运行时，我收到以下错误消息：

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". …

我有一个'^'分隔的产品ID号列表,我需要只获取产品ID号,然后用它来查询SQL数据库.产品ID号存储在$ _SESSION哈希中.例如:

SKUS: jpn18726^gr172645^123746^17246^eu186726^...

我能想到的代码是这样的:

$prodmat = $_SESSION["product"];
if(preg_match("(\d+)(^\s*\d+)*", $prodmat) {
    $stmt = "select shipcode from materials where material='???'";
}

基本上,我想从'^'分隔列表中提取产品ID号,然后使用产品ID号查询DB.