I have installed MinGW on netbeans for C and C++ programming.
Here is a simple code that I am trying to run on netbeans :
#include <stdio.h>
int main(int argc, char** argv) {
printf("Inside Main...\n");
int n;
printf("Enter : ");
scanf("%d", &n); // When I remove this line, it is working.
printf("You have entered %d.", n);
return (1);
}
Whenever I try to access any value from netbeans console, I don't see anything.
Output with scanf(...)
Output without scanf(...)
And if I try to run these code from cmd, all are working
for scanf() you must use Netbeans External Terminal !
Normal Run
You can also use Netbeans Standard Output !
But this is more misleading.
While you see an empty Terminal do input 123
after hit enter , you get the output all at once .
I had the same issue while running a CPP program.External output didn't helped me. I set the console type to Standard output and it solved the issue.
Right Click cpp Application-->properties-->run--->Consoletype to standard output
Related
So basically, I have this simple Hello World program and when executed, it outputs correctly.
#include <stdio.h>
int main(){
printf("Hello");
}
Output: Hello
But for some reason adding a scanf command will cause the program to not output anything. It will display that it's running but it won't display anything.
#include <stdio.h>
int num1;
int main(){
printf("Enter number: \n");
scanf("%d", &num1);
printf("%d", num1);
}
Output:
[Running] cd "d:\programming\" && gcc main.c -o main && "d:\programming\"main
I know my code is okay since I tried it on other IDEs and it worked correctly. I even copied code from the internet and tried to run in VSCode but it still didn't work. It still works perfectly fine yesterday but this problem just pops in nowhere.
I use Visual Studio Code 1.62.3 with C/C++, C/C++ Compile Run, and Code Runner extensions.
It's a buffering problem. When standard output (stdout, where printf writes) is connected to an actual terminal then it's line-buffered, which means output is actually written to the terminal when there's a newline.
However, VSCode probably uses its own terminal emulation and uses pipes to connect stdout to that terminal. That means the output will be fully buffered, and you need to explicitly flush it.
So modify the code as such:
printf("Enter number: \n");
fflush(stdout); // Actually write the output to standard output
scanf("%d", &num1);
printf("%d", num1);
That it works for the first example is because then the process terminates, and all output is flushed automatically.
I ran a 4 line code and it compiled and linked without a hitch, but it refuses to print anything
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(){
char* a = "book";
printf("%s\n", a);
return 0;
}
After compiling it and running the executable, nothing happens.
No error in the code.
Just write getch(); or getchar() before return 0;
to holding the output screen.
getch() or getchar() will hold the ouput screen for getting the user's input.
Works fine for me.
You've tagged this with terminal; if you are running it from the terminal, you should see some output, in my experience.
If you are running from an IDE,
keep the window open using Kapil K.'s answer;
keep the window open using an IDE setting, if there is one; or
find out where your IDE is putting the executable file, and run that from a terminal.
In C there is a error I'm facing
that when ever I use getch() command in my code and run it either in codeblocks or the .exe file after everything is done and when the control goes to getch() command it shows an error pop up window saying
Drawing operation was attempted when there was no current window.
#include <stdio.h>
#include <conio.h>
int main() {
int a;
scanf("%d", &a);
printf("%d", a);
getch();
return(0);
}
Using Code::Blocks 16.01.
Use _getch() instead of getch():
#include<conio.h>
_getch();
Source: https://learn.microsoft.com/cpp/c-runtime-library/reference/getch
I researched, what I understood was that the command getch is deprecated and the command you can use to replace it is the _getch.
There is more information at this link:
https://learn.microsoft.com/cpp/c-runtime-library/reference/getch
I've started to learn a C language and i am using netbeans IDE.
I tried the most simple classic = printing "Hello World".
code
int main(int argc, char** argv) {
printf('Hello World!');
return (EXIT_SUCCESS);
}
When i run projects, netbeans writes BUILD SUCCESSFUL (total time: ...)
but then it writes
read from master failed
: Input/output error
RUN FAILED (exit value 1, total time: 414ms)
How to make it work?
This is the Hello World program. It includes the relevant library header file. I added the newline with \n to ensure the output buffer is flushed.
#include<stdio.h>
int main(void) {
printf("Hello World!\n");
return 0;
}
Program output:
Hello World!
Your problem is coming from Netbeans IDE. Right click your project and go to properties. In the properties, click run and change the console type to standard output.
Using:
Code::Blocks Software
Teach Yourself C book
None of "command line argument" example programs work. They either crash or execute with all variables with 0 value or show similar results to the program below.
#include <stdio.h>
int main(int argc, char *argv[])
{
return 0;
}
The simplest of the example program is below.
#include <stdio.h>
int main(int argc, char *argv[])
{
int i;
for(i=1; i<argc; i++) printf("%s ", arv[i]);
return 0;
}
With a bit of googling I have found that I need to have a Project as a Console Application and then use Project -> set programs arguments, but I have no idea of what to do in the window that pops up.
If you have compiled your project as a console application, you can pass arguments by calling the program from the console (cmd.exe in Windows, terminal in Linux).
The window Project -> set programs arguments simply asks you what arguments do you want to pass to the program when you run the program from Code::Blocks (using the green arrow).
Simply add your arguments in the "Program arguments" text box.