C equivalent of "cin.get()"

ikislav · 11-10-2009, 06:12 AM

Hello...

This is my first post on this forums. I have been learning a bit of C++ in the past and got to the point where I was able to write a drawing program (Console drawing program, where you "draw" with characters. Program had a few different brushes, two layers, save and load capabilities). Now I want to suspend my learning of C++ and switch over to C and learn it well before I switch back to C++ and throw myself at OOP, classes and stuff. Reasons for this, no matter how illogical they seam, are my own

My question is this:
Since I am using <stdio.h> instead of <iostream>, I cant find an equivalent of cin.get() in stdio. I need it to stop the program from finishing... i.e. when I wrote Hello world program in C using stdio, upon its execution I saw a console window flashing for a millisecond without seeing the results of a program. Can anyone help?

RockyMarrone · 11-10-2009, 06:15 AM

Ok First of all welcome to the forum

Have nice learning exp of C/C++ here

You can have getch on windows and you can just run your program in release mode

not it debug it will show you without getch

for this just press CTRL+F5 for debug building and running you do F5 just do CTRL+F5

Memloop · 11-10-2009, 06:15 AM

getchar or getc(stdin)

ikislav · 11-10-2009, 06:45 AM

Thank you, this really helps

Few more questions: Is getchar() a part of standard library? Is getchar() going to interfere with my input if I use it in the middle of a program (i.e. like putting read character into some kind of buffer and then adding it to whatever scanf() reads)?

RockyMarrone · 11-10-2009, 06:48 AM

yup getchar() is equivalent to getc(stdin) and it will return the int

ikislav · 11-10-2009, 07:19 AM

Ouch... my fears have come to pass... this is what I mean:

Code:

#include <stdio.h>

int main() {
    int something;
    
    printf("blahblahblah!\n");
    getchar();
    scanf("%i", &something);
    printf("%i", something);
    getchar();
     
    return 0;
}

It doesn't work

Program quits as soon as I input an integer

kryptkat · 11-10-2009, 07:33 AM

try %d
meow.

**laserlight** · 11-10-2009, 07:51 AM

Read: Pause console.

ikislav · 11-10-2009, 08:11 AM

@kryptkat -- I didn't quite understand what you meant by "try %d".
@laserlight -- Nice article, thank you, helped me a lot

Adak · 11-10-2009, 08:22 AM

Quote:

Originally Posted by ikislav

@kryptkat -- I didn't quite understand what you meant by "try %d".
@laserlight -- Nice article, thank you, helped me a lot

%d is a common data type format for scanf, e.g. scanf("%d", &number)

Check with your compiler and see if yours has any differences between %d and %i, for scanning in integers.

I like the int or char variable = getchar() to hold the console window open. If it still closes, then I go medieval on it:

Code:

while((somevar = getchar()) != '\n');
somevar = getchar();

It isn't always needed, but it will stop a console window from closing.

**laserlight** · 11-10-2009, 08:29 AM

Quote:

Originally Posted by Adak

it is my understanding that %i can also be used for scanf(), to get an integer.

The difference is that %d is used to read in the integer in base 10, but %i is used to read in the integer using the same rules as integer constants in C, e.g., a 0 prefix for octal and a 0x or 0X prefix for hexadecimal.

Memloop · 11-10-2009, 08:33 AM

scanf will also leave the newline in the input buffer so when you use getchar() directly after scanf it will just read the newline and quit instead of pausing like you want it to.

ikislav · 11-11-2009, 06:25 AM

Is there any function I can use to empty the input buffer?

RockyMarrone · 11-11-2009, 06:33 AM

flush

Brain_Child · 11-11-2009, 06:52 AM

Quote:

Originally Posted by RockyMarrone

flush

cant use fflush to clear the input buffer

Cprogramming.com FAQ > Why fflush(stdin) is wrong

Quote:

Is there any function I can use to empty the input buffer?

see here

Cprogramming.com FAQ > Flush the input buffer

11-10-2009, 06:12 AM	#1
ikislav Registered User Join Date: Nov 2009 Posts: 6	C equivalent of "cin.get()" Hello... This is my first post on this forums. I have been learning a bit of C++ in the past and got to the point where I was able to write a drawing program (Console drawing program, where you "draw" with characters. Program had a few different brushes, two layers, save and load capabilities). Now I want to suspend my learning of C++ and switch over to C and learn it well before I switch back to C++ and throw myself at OOP, classes and stuff. Reasons for this, no matter how illogical they seam, are my own My question is this: Since I am using <stdio.h> instead of <iostream>, I cant find an equivalent of cin.get() in stdio. I need it to stop the program from finishing... i.e. when I wrote Hello world program in C using stdio, upon its execution I saw a console window flashing for a millisecond without seeing the results of a program. Can anyone help?
ikislav is offline

11-10-2009, 06:15 AM	#2
RockyMarrone Registered User Join Date: Oct 2009 Location: While(1) Posts: 316	Ok First of all welcome to the forum Have nice learning exp of C/C++ here You can have getch on windows and you can just run your program in release mode not it debug it will show you without getch for this just press CTRL+F5 for debug building and running you do F5 just do CTRL+F5
RockyMarrone is offline

11-10-2009, 06:15 AM	#3
Memloop Robot Join Date: Mar 2009 Posts: 100	getchar or getc(stdin)
Memloop is offline

11-10-2009, 06:45 AM	#4
ikislav Registered User Join Date: Nov 2009 Posts: 6	Thank you, this really helps Few more questions: Is getchar() a part of standard library? Is getchar() going to interfere with my input if I use it in the middle of a program (i.e. like putting read character into some kind of buffer and then adding it to whatever scanf() reads)?
ikislav is offline

11-10-2009, 06:48 AM	#5
RockyMarrone Registered User Join Date: Oct 2009 Location: While(1) Posts: 316	yup getchar() is equivalent to getc(stdin) and it will return the int
RockyMarrone is offline

11-10-2009, 07:19 AM	#6
ikislav Registered User Join Date: Nov 2009 Posts: 6	Ouch... my fears have come to pass... this is what I mean: Code: #include <stdio.h> int main() { int something; printf("blahblahblah!\n"); getchar(); scanf("%i", &something); printf("%i", something); getchar(); return 0; } It doesn't work Program quits as soon as I input an integer
ikislav is offline

11-10-2009, 07:33 AM	#7
kryptkat Registered User Join Date: Dec 2002 Posts: 409	try %d meow.
kryptkat is offline

11-10-2009, 07:51 AM	#8
laserlight C++ Witch Join Date: Oct 2003 Location: Singapore Posts: 10,368	Read: Pause console. __________________ C + C++ Compiler: MinGW port of GCC Build + Version Control System: SCons + Bazaar Look up a C/C++ Reference and learn How To Ask Questions The Smart Way
laserlight is offline

11-10-2009, 08:11 AM	#9
ikislav Registered User Join Date: Nov 2009 Posts: 6	@kryptkat -- I didn't quite understand what you meant by "try %d". @laserlight -- Nice article, thank you, helped me a lot
ikislav is offline

11-10-2009, 08:33 AM	#12
Memloop Robot Join Date: Mar 2009 Posts: 100	scanf will also leave the newline in the input buffer so when you use getchar() directly after scanf it will just read the newline and quit instead of pausing like you want it to.
Memloop is offline

11-11-2009, 06:25 AM	#13
ikislav Registered User Join Date: Nov 2009 Posts: 6	Is there any function I can use to empty the input buffer?
ikislav is offline

11-11-2009, 06:33 AM	#14
RockyMarrone Registered User Join Date: Oct 2009 Location: While(1) Posts: 316	flush
RockyMarrone is offline

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