while-loop

问题 I was wondering why I got an error saying Notice: Undefined variable: query_add_landdev_temp_payroll in C:\xampp\htdocs\op\ajax\ajaxLanddevNTPPayroll.php on line xx . for the past 2 weeks, it works perfect. When I tried to execute the code today, I got that kind of error. Here is my code: $query_get_payroll = mysqli_query($new_conn, "SELECT ntp_with_ob_payroll_transaction.ntp_id, ntp_with_ob_payroll_transaction.allotment_code, ntp_with_ob_payroll_transaction.category_name, ntp_with_ob_payroll

问题 This question already has answers here : While-loop subshell dilemma in Bash (4 answers) Closed 9 months ago . Because I trapped into this myself, I asked a question and did give also the answer here. If find iterates over what the command did find, this is executed from bash in a subshell. So you can not fill an array with results and use it after your loop. 回答1: You have to change the syntax from: i=0 find $cont_dirs_abs -type l -exec test -e {} \; -print0 | while IFS= read -r -d '' lxc

问题 In the if statements of my while loops, I want it to loop back to ask for the company name when the user sets verify_name to no. However, if the user inputs sets verify_name to no, it re-loops to the verify_name input. How can I fix this so that it breaks out of this loop and re-ask the company name? import time while True: company_name = input("\nWhat is the name of your company? ") while True: verify_name = input("\nPlease verify that {} is the correct name of your company \nusing Yes or No

问题 I am trying to read from a text file of students and assign each line to a struct data member. The text file structure is as follows: Name,Student code, Ability,Consistency,Program name:Subject list Two students in the file: Average Ant,204932,50,5,Short course:1 Brilliant Bison,234543,80,3,Bachelor of Bounciness:2,5,3 I can read all of the information to a struct no problem except for the last part(subject list),that are of varying length between students. How can I write code so that if a

问题 I've seen people trying to read files like this in a lot of posts lately. Code #include <stdio.h> #include <stdlib.h> int main(int argc, char **argv) { char *path = argc > 1 ? argv[1] : "input.txt"; FILE *fp = fopen(path, "r"); if( fp == NULL ) { perror(path); return EXIT_FAILURE; } while( !feof(fp) ) { /* THIS IS WRONG */ /* Read and process data from file… */ } if( fclose(fp) == 0 ) { return EXIT_SUCCESS; } else { perror(path); return EXIT_FAILURE; } } What is wrong with this loop? 回答1: I'd

问题 I want to look for peaks and troughs in a given vector of data, with the following definition. A "peak" is a local maximum at least x% higher than the preceding trough, and a "trough" is a local minimum at least x% lower than the preceding peak. x here is referred to as a cutoff. In the paper I am writing, the cutoff is referred to as the standard deviation of the data. I thought of writing a function that enables me to find a peak and a trough. The function that I wrote was this. I will call

问题 I am using phpmailer to send bulk emails to my subscribers but I am facing a terrible problem that is when I send emails to my subscribers, each subscriber is getting the same email more than once. some are getting 4 times and some are getting 14 times. I am fetching subscriber emails where flag = 0 through Mysql table and at the end of the while loop I am updating subscriber flag to 1. I know its a issue of loop but I don't know where I am doing wrong or even not sure should I used while

问题 I have a while loop in my codebehind and I want to monitor the progress, so each time I go into the loop, I wish my page draws something (a point) and when the loop breaks I would see the entire progress (scatterplot) My code is like the following: while (iter <= Common.maxIter) { ScriptManager.RegisterStartupScript(this, this.GetType(), "myFunc" + iter.ToString(), "Display()", true); //doing something else } The function Display() draws one point each time. My problem is, only after I break

问题 I'm starting now with C++, so I imagine this is gonna be a very easy-newbie question. Well, why the "cin >> x" line inside while doesn't stop the loop to get the user input (if the user inputs a character, in place of a number)? #include <iostream> using std::cin; using std::cout; using std::endl; int main() { int x = 0; cout << "Please, enter x: "; cin >> x; while (!cin) { cout << "Please, it must be a number!\n"; cin >> x; } cout << "Thanks!."; cin.ignore(); cin.ignore(); } I'm barely two

问题 Hey guys I'm coding something that seems really weird to me, and I can't logically figure out how to implement it, and I feel like if I do it'll be cpu melting - so I figure I'd ask people who really know. What I want to do is check if a file exists, if it doesn't, perform an action, then check again, until the file exists and then the code passes on with that. I've tried Googling to little avail. Thanks to anyone who helps! 回答1: For simplicity, I would implement a small polling function,