comparison

问题 This question already has answers here : strange output in comparison of float with float literal (8 answers) Floating point comparison `a != 0.7` [duplicate] (3 answers) Closed 5 years ago . Here 'a' should get printed as 0.7 < 0.7 is false, but 'c' is printed. #include<stdio.h> void main() { float a=0.7; if(a<0.7) printf("c"); else printf("a"); } 回答1: You seem to misunderstand floating point numbers. See this question. One thing you can do is think "Well, it will never be exactly 0.7, so

问题 I have this code which compare two sample text files and report any numeric mismatch. Text1: C_A C_A 0.0000 0.0000 0 0 50 47 100 390 C_A/I0/I2 INV 1.0400 0.2210 0 0 530 200 250 261 C_A/I0/I0 INV 0.0200 0.2210 0 0 20 200 30 100 Text2: C_A C_A 0.0000 0 0 0 50 47 100 390 C_A/I0/I0 INV 0.0200 0.2213 0 0 20 200 40 100 C_A/I0/I2 INV 1.00 0.2210 1 1 535 200.00 250 261 code: use strict; use warnings; my %ref_data; open my $fh, '<', 'Text1' or die "Could not open to read: $!"; while (<$fh>) { chomp;

问题 So, I have two instances of a class Person and I am trying to do some comparisons. sun is one of several attributes of each instance is defined by two randomly generated numbers. I have the following questions... Is creating a subclass like Match the right way to go about setting up this comparison? And I want an overall "score" compiled at the end of this comparison, can I do that without the for-loop? Person1 = Person("Person1") Person2 = Person("Person2") class Match(Person): overall = 0

问题 I need to create an excel sheet comparing two sample sheets one contains the serial number and other information. Second sheet contains the warranty date. For example, source1 sheet contains data as below Model Serial Location Dell 1234 A Thoshiba 2345 B Apple 3456 C Cisco 4567 D Sun 5678 E source2 contains data as below Serial Warranty Status 2345 1/1/2010 4567 2/2/2012 1112 3/2/2015 and the result should be Model Serial Location Warranty Status Dell 1234 A Not Found Thoshiba 2345 B 1/1/2010

问题 This question already has answers here : pair-wise duplicate removal from dataframe [duplicate] (4 answers) Closed 3 years ago . The data I have is something like that: RES1 <- c("A","B","A","A","B") RES2 <- c("B","A","A","B","A") VAL1 <-c(3,5,3,6,8) VAL2 <- c(5,3,7,2,7) dff <- data.frame(RES1,VAL1,RES2,VAL2) dff RES1 VAL1 RES2 VAL2 1 A 3 B 5 2 B 5 A 3 3 A 3 A 7 4 A 6 B 2 5 B 8 A 7 I want to remove the lines where I already have the same res1-res2 pair. For example: A 3 interacts with B 5.

问题 I want to find out what will be the time in india when clock tick to 1Am mid night in any other country.. How i will find out that through any means plz help me to find out this this is to fire birthbay mails at 1AM midnight of that resp country... 回答1: SQL SERVER 2008 would have the DATETIMEOFFSET data type (which includes the time zone) plus functions like SWITCHOFFSET to switch from one timezone offset to another. What version are you on? 回答2: .NET 3.5 added the class TimeZoneInfo which

问题 Okay hi everyone, again. So I have already posted several similar questions but to no avail.. I decided to post another one as I think it would be pretty messy to keep commenting below. The links for my previous questions are here and here I decided to try and change @Vasily codes as his provides the closest results. Please click the second link to view his original codes if need be. So my original problem was to compare data from 2 worksheets, both which includes an "eRequest ID" column in

问题 After I enter a string in c and store it in for example char s[100], how can I compare that string to all function names in a math.h? For example, I enter pow and the result will look like this in stored form. s[0]='p' s[1]='o' s[2]='w' s[3]='\0' Since my string is the equivalent of pow(), I want my program to recognise that and then call pow() during execution of my program. I know it is not that hard to do string comparison within the code, but that would mean that I would have to do string

问题 This question already has an answer here : Can we and how safe is to “signed” to “unsigned” trick to save one comparison in this case? (1 answer) Closed 4 years ago . So from what I know the following two functions' behavior should be exactly the same. However, if I implement using the first one, the compiler seems can't realize it's equivalent to the second. Is there anyway to hint the compiler to use the second ? In another words, I hate to do the static_cast things... Anyway to avoid it? /

问题 I'm sorry, the title's awful; however, I couldn't think of any better way to summarize my plight. In trying to solve a problem involving checking to see if one string is an anagram of another, I implemented a solution that involved removing all whitespace from both strings, converting them both to character arrays, sorting them and then seeing if they are equal to eachother. If so, the program prints out "Is an anagram.", otherwise "Is not an anagram." The problem is that even though my code