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  • Declaring arrays in c language without initial size

    - by user2534857
    this is the question-- Write a program to manipulate the temperature details as given below. - Input the number of days to be calculated. – Main function - Input temperature in Celsius – input function - Convert the temperature from Celsius to Fahrenheit.- Separate function - find the average temperature in Fahrenheit. how can I make this program without initial size of array ?? #include<stdio.h> #include<conio.h> void input(int); int temp[10]; int d; void main() { int x=0; float avg=0,t=0; printf("\nHow many days : "); scanf("%d",&d); input(d); conv(); for(x=0;x<d;x++) { t=t+temp[x]; } avg=t/d; printf("Avarage is %f",avg); getch(); } void input(int d) { int x=0; for(x=0;x<d;x++) { printf("Input temperature in Celsius for #%d day",x+1); scanf("%d",&temp[x]); } } void conv() { int x=0; for(x=0;x<d;x++) { temp[x]=1.8*temp[x]+32; } }

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  • a macro question for c language (#define)

    - by Daniel
    I am reading source code of hoard memory allocator, and in the file of gnuwrapper.cpp, there are the following code #define CUSTOM_MALLOC(x) CUSTOM_PREFIX(malloc)(x) What's the meaning of CUSTOM_PREFIX(malloc)(x)? is CUSTOM_PREFIX a function? But as a function it didn't defined anywhere. If it's variable, then how can we use variable like var(malloc)(x)? more code: #ifndef __GNUC__ #error "This file requires the GNU compiler." #endif #include <string.h> #include <stdlib.h> #include <stdio.h> #include <malloc.h> #ifndef CUSTOM_PREFIX ==> here looks like it's a variable, so if it doesn't define, then define here. #define CUSTOM_PREFIX #endif #define CUSTOM_MALLOC(x) CUSTOM_PREFIX(malloc)(x) ===> what's the meaning of this? #define CUSTOM_FREE(x) CUSTOM_PREFIX(free)(x) #define CUSTOM_REALLOC(x,y) CUSTOM_PREFIX(realloc)(x,y) #define CUSTOM_MEMALIGN(x,y) CUSTOM_PREFIX(memalign)(x,y)

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  • storing characters in char data type C language

    - by iSight
    Hi, I can store string of few length in char data type. But when it exceeds its capacity what can be the alternative way to store string. I am using char data type. void setString(char* inPoints) { if (strcmp(mPoints, inPoints)!= ZERO) { if (mPoints) { free(mPoints); } mPoints = (char*)malloc((strlen(inPoints) + 1) * sizeof(char)); strcpy(mPoints, inPoints); } }

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  • Language Prejudices

    - by paranoid_pedlar
    I've been researching programming languages, in hopes of learning to program. Since I've heard a lot of good things about Ruby, I went ahead and purchased The Pragmatic guide to Ruby. I understand that there is a lot of hype about Ruby on Rails. Because ruby lets you program scripts, applications, and internet helped me to decide on learning Ruby vs other languages. Today I watched a talk about google go, and it's really caught my attention. Coincidently I stumbled on a talk about jruby. I've been under the impression that java applications are bloated an slow. However the speaker made a point of what is wrong with Ruby, and how Jruby diagnosed Ruby's shortcomings. All that said. I would like to hear peoples opinions on Jruby vs Ruby, and if Ruby is working on fixing these "short comings". Also, how do you, the programming community feel about "go" and if I'm making a mistake learning Ruby instead of go, or Jruby. Appreciate your advice and opinions Thanks,

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  • compile error:c language in telnet(linux)

    - by lilyrose07
    #include<stdio.h> #include<unistd.h> #include<stdlib.h> #include<pthread.h> int count=0; void *thread_function(void *arg) { while(count<10) { if(count%2==1) { count++; } else {sleep(1);} } } int main(int argc,int *argv) { int res; pthread_t a_thread[2]; void *thread_result; int n; while(count<10) { if(count%2==0) {printf("%d",count); count++; } else{sleep(1);} } for(n=0;n<2;n++) { pthread_create(&(a_thread[n]),NULL,thread_function,NULL); } while(count==9) {pthread_join(a_thread[0],&thread_result); } while(count==10) { pthread_join(a_thread[1],&thread_result); } printf("%d",count); return 0; } in telnet,linux i write gcc za.c error list: undefined reference to pthread_create,pthread_join in function 'main' //why??

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  • Language in mdi forms

    - by WFgo
    I have a problem with set lenguage to MDI forms. In my main form I have a menustrip and I use resource file for translate I wanted to know if I'm doing the right thing My code is this (Example): Public Class Main Public SNFrm As New SalesNote Private Sub SetLanguage() SNFrm.Text = My.Resources.... SNFrm.AcceptBtn.Text = My.Resources... End Sub Private Sub MenuSalesNote_Click(......) SNFrm = New SalesNote SNFrm.MdiParent = Me SNFrm.StartPosition = FormStartPosition.CenterScreen SNFrm.Show() End Sub End Class Then, in My SalesNote Form_Closing Event Main.SNFrm.Dispose() is this correctly? Help!

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  • Infrastructure for high transactional system (language & hosting suggestion help)

    - by RPS
    Some of our friends (University students) are trying to develop a twitter type application, I want to plan for at least 1000 transactions per second (I know it's wishful thinking) for initial launch. This involves several people connecting and getting updates and posting (text + images) to site. In the back end db will server the data and also calculates rankings of what to push to user based on complex algorithm on the fly real-time. Our group is familiar with Java and Tomcat/MySQL. We can also easily learn/code in PHP/MySQL. What is the best suited platform for our purpose ? Though Java seem to be easy to implement for us I am afraid that hosting will be a bit difficult. I could find cloud based php hosting services (like rackspace cloudsites) at reasonable cost. Amazon EC2 is a bit over our heads to manage on day-to-day. Also any recommendation on hosting ? (PHP or Java) We don't have millions in seed money but about $20K to start with. Any advice on above or any thing in general approach is much appreciated.

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  • regarding java programming language

    - by giri
    Hi I am java professional since last one year. I am pretty familier with core java and JSP and SERVLET technologies.Now I am hired by a telcom company where java is not used.The question I like to ask here is how to keep java enviornment around me so that I should not be unfamiler with java. As I come from company I get much time to work with java. I like to know any real time projects in java available so that I can work with java also. Please let me know... Thanks in advance

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  • c programming Language [closed]

    - by ash89
    Write a program in C program to find the sum of the following: The input contain a sequence of two or more positive integers terminated by -1. Write a piece of code to count the ‘incidences’ in this sequence (i.e. the number of pairs of equal, adjacent numbers). For example, the following sequence contains 4 incidences: 4 2 9 9 3 7 7 7 3 3 -1

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  • What is the correct way to deal with similar but independent features?

    - by Koviko
    Let's say we have a feature request come in and we begin work on it, which we'll call feature-1. It introduces some new logic to the application, which we'll call logic-A and logic-B. A programmer branches from the release branch and begins work on the feature. Soon after, we get another feature request, which we'll call feature-2. It will implement logic-A and logic-C into the application. The logic A being implemented by this feature is the same logic-A as was implemented in feature-1. Let's also say that given logic-B, logic-A might be implemented slightly differently than it would have been given logic-C, and also differently given both logic-B and logic-C (eg. with only one feature, the code would be less flexible than with both). How should this situation be handled? Concrete Example (to help with any confusion in my wording) feature-1 is a feed from programmers.stackexchange.com. feature-2 is a feed from gaming.stackexchange.com. logic-A is the implementation of a feed at all (assuming the application currently has no feeds), which links to the content as well and gives related information. logic-B is that the feed's source is from programmers.stackexchange.com. Adds to logic-A that the related programming language is displayed. logic-C is that the feed's source is from gaming.stackexchange.com. Adds to logic-A that the related game's name and box art is displayed.

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  • Install a i386 printer driver into an amd64 distribution or how can I find a good printer based on features?

    - by Yanick Rochon
    Hi, I just bought a Lexmark Interpret S408 all-in-one printer. The box said that it supported Ubuntu 8.04, but I told myself it should work with Lucid... well no. The only driver I have found is for i386 while I have a amd64 image installed; the architecture is incompatible. So, the quesiton is : Is it possible to install that driver anyway, somehow? Or do I need to take that printer back to the store and buy another one? If the latter is the only alternative, I need a printer that has wireless connection capability can do color printing is of good price (less than $200 CAD) Thank you for your answers, help, and tips. ** UPDATE ** The driver was given in the form of deb package (for Debian distributions) and I managed to extract the actual deb package driver out of the install program. I ran sudo dpkg -i --force-all lexmark-inkjet-09-driver-1.5-1.i386.deb and the driver installed, and I was able to print something out. But that pretty much ends there; I cannot access anymore of the printer settings, etc. (i.g. scanner, fax, wifi settings, etc.) I should suffice for now as I'm satisfied with the printer's features (and size, and prince), but if I could have a full-linux-supported printer like that one, I would return this one in exchange for the other.

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  • Is there a common programming term for the problems of adding features to an already-featureful program?

    - by Jeremy Friesner
    I'm looking for a commonly used programming term to describe a software-engineering phenomenon, which (for lack of a better way to describe it) I'll illustrate first with a couple of examples-by-analogy: Scenario 1: We want to build/extend a subway system on the outskirts of a small town in Wyoming. There are the usual subway-problems to solve, of course (hiring the right construction company, choosing the best route, buying the subway cars), but other than that it's pretty straightforward to implement the system because there aren't a huge number of constraints to satisfy. Scenario 2: Same as above, except now we need to build/extend the subway system in downtown Los Angeles. Here we face all of the problems we did in case (1), but also additional problems -- most of the applicable space is already in use, and has a vocal constituency which will protest loudly if we inconvenience them by repurposing, redesigning, or otherwise modifying the infrastructure that they rely on. Because of this, extensions to the system happen either very slowly and expensively, or they don't happen at all. I sometimes see a similar pattern with software development -- adding a new feature to a small/simple program is straightforward, but as the program grows, adding further new features becomes more and more difficult, if only because it is difficult to integrate the new feature without adversely affecting any of the large number of existing use-cases or user-constituencies. (even with a robust, adaptable program design, you run into the problem of the user interface becoming so elaborate that the program becomes difficult to learn or use) Is there a term for this phenomenon?

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