if-statement

问题 This question already has answers here : “strlen(s1) - strlen(s2)” is never less than zero (3 answers) Closed 6 years ago . Here i am confused with condition statement which has negative number,if in the condition only negative number is given as if(-1) then it is true but if (-1>0) then it become false please explain any one thanks in advance if(-1) // This true why and how? if(-1>0)//This is false why and how Now what is impact in below code please help to understand #include <stdio.h>

问题 This question already has an answer here : How to add a factor column to dataframe based on a conditional statement from another column? (1 answer) Closed 7 years ago . The answer to the following question has been addressed more simply than this answer: Create new column with binary data based on several columns I am trying to create a new column of binary data (presence/absence data) based on another column in R . I want "Species_code" rows with the number 101 to produce a 1 in the new

问题 I'm building a pretty complicated VBA workbook, and one of the issues on running much of the code is performance. I have a built in function that does, more or less, the following Public Function zzz (xxx as String) as String if xxx = "apple" then zzz = "orange" if xxx = "appple2" then zzz = "orange2" if xxx = "apple3" then zzz = "apple3" etc. (but with about 30 strings instead). I call this function multiple times. Is there a better way to do this? 回答1: Hardly. And for 30 strings, this

问题 Hi I am trying to do an if statement to see if values have an exact match in an array. Then I want it the sibling element to show the html of what the exact match is. Can someone help please! I use TWIG for the HTML from Advanced Custom Fields Wordpress plugin. Image of all the locations that I want to say only once with the number of times they are mentioned. This is for a filter functionality. Eventually want to have a dropdown like https://codepen.io/luciopaiva/pen/YXYGYE?editors=101 with

问题 I'm trying to write a function that will iterate through a variable holding objects. If you pass in a first name that is an object property, you should get true. If not, you should get false. However, no matter what I pass through the function, I always get false. Any help is greatly appreciated. var contacts = [ { "firstName": "Akira", "lastName": "Laine", "number": "0543236543", "likes": ["Pizza", "Coding", "Brownie Points"] }, { "firstName": "Harry", "lastName": "Potter", "number":

问题 I'm trying to write a function that will iterate through a variable holding objects. If you pass in a first name that is an object property, you should get true. If not, you should get false. However, no matter what I pass through the function, I always get false. Any help is greatly appreciated. var contacts = [ { "firstName": "Akira", "lastName": "Laine", "number": "0543236543", "likes": ["Pizza", "Coding", "Brownie Points"] }, { "firstName": "Harry", "lastName": "Potter", "number":

问题 This is my first post in this community and I am a beginner of course. I look forward to the day I can help others out. Anyway, this is the a simple code and I would like it so that there is an error if the user enters a string. Unfortunately, it does not execute the way I'd like to, here's the code: number = 1 guess = int(input('Guess this number: ')) while True: try: if guess > number: print("Number is too high, go lower, try again") guess = int(input('Guess this number: ')) elif guess <

问题 I have data like this: cols <- c("X01_01","X01_01_p", "X01_02","X01_02_p", "X01_03","X01_03_p", "X01_04", "X01_05","X01_06") set.seed(111) values <- replicate(9, sample(1:5, 4, replace = TRUE)) df <- as.data.frame(values) So my df looks like this: X01_01 X01_01_p X01_02 X01_02_p X01_03 X01_03_p X01_04 X01_05 X01_06 1 3 2 3 1 1 3 5 4 3 2 4 3 1 1 5 2 2 3 3 3 2 1 3 1 2 2 4 1 2 4 3 3 3 3 4 2 2 3 4 I have some columns to use for mutation (not all) and the names of the new columns. cols_to_mutate <

问题 I have a Text that acts as a timer with different values of my array. And it displays with timerIntervalSinceNow . The problem is when it reaches zero it should show zero to but that does not happen before clicking again on the screen. If I do not click on it it keeps going up since it is timeIntervalSinceNow , but when I click it switches to the Text with 0 sec . Any way on telling SwiftUI to do this by itself without clicking? if(exerciseTime[value].timeIntervalSinceNow > 0) { Text

问题 I am practicing swift programing by making an app that holds customers' data. The app has several text fields where people are supposed to type their name, email address, phone number, and quantity of products purchased. Then with a 'submit' button they save that information into the data base. However, if one of the fields is empty, an error should be thrown and a message should appear to the user letting him/her know that one of the fields empty. The problem is that even if the textfield is