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Scanf Statement Not Working

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Second Scanf Not Working

This should generate a compiler error. So what? The easiest way to make it do so is to place whitespace before the %c: scanf(" %c", &achar); (Any whitespace in the format string will make scanf consume all consecutive whitespace). asked 2 years ago viewed 206 times active 2 years ago Upcoming Events 2016 Community Moderator Election ends in 7 days Blog How We Make Money at Stack Overflow: 2016 Edition

Reading and writing data in big chunks is much more efficient than a byte (or character) at a time. It finds a '\n' and stops without needing any additional keyboard input. The fgets() then starts reading data from the input buffer. Multiple Scanf In C Are human fetal cells used to produce Pepsi?

Then the value of ch must be cast back to an int to compare it with EOF. Scanf Not Working In C Though even that is not reliable - if the user typed a space or something after the number and before the newline. asked 6 years ago viewed 18325 times active 1 year ago Upcoming Events 2016 Community Moderator Election ends in 7 days Blog How We Make Money at Stack Overflow: 2016 Edition current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list.

share|improve this answer answered Oct 26 '10 at 12:32 leppie 84.3k13148256 +1 I need to learn to type faster :D –nathan Oct 26 '10 at 12:39 add a comment| Scanf C Example After this, feof() will return true (since fgets() failed) and the loop ends. don't do this. –Variable Length Coder Sep 19 '10 at 6:44 @Variable Length Coder: I'm sorry about that, was paraphrasing a simpler example and mixed to the two up. Can it work?

Scanf Not Working In C

Home Programming Email me PC Assembly Tutorial Common C Errors Debugging Tips Multi-module Programs Using Emacs Blog Common C Programming Errors Table of Contents1. been linked to insufficient sleep"? Second Scanf Not Working Your suggestion is maybe a solution for OP's problem (we don't know much about it, though, because OP doesn't provide the input she gave and the output she got) if this C Programming Scanf Not Working share|improve this answer answered Sep 19 '10 at 6:44 Jonathan Leffler 444k62516830 add a comment| up vote 0 down vote Try also _flushall() after each printf call. .

Get Started with C or C++ C Tutorial C++ Tutorial Get the C++ Book All Tutorials Advanced Search Forum General Programming Boards C Programming Scanf inside IF statement not working Getting Can it work? But When I run the program after I compile(successfully). Many programmers use it like Pascal's eof() function. Scanf Doesn't Work

Did the Gang of Four really thoroughly explore "Pattern Space"? For example: scanf("\n%c", &achar); would work too. –cpx Dec 15 '12 at 17:29 2 @cpx: Because a newline is whitespace. Also, the two successive scanf()s has same argument to store the input. In what sense is Principia mathematica of Russell and Whitehead a metatheory?

Not the answer you're looking for? How To Use Scanf Join them; it only takes a minute: Sign up Simple C scanf does not work? String Errors 3.1 Confusing character and string constants C considers character and string constants as very different things.

Can someone explain this visual proof of the sum of squares?

What is the best way to save values (like strings) for later use? What should I do about this security issue? Since the returned value is stored in a double variable, the compiler inserts code to convert the value to a double. How To Use Fgets asked 2 years ago viewed 1073 times active 2 years ago Upcoming Events 2016 Community Moderator Election ends in 7 days Blog How We Make Money at Stack Overflow: 2016 Edition

Where to get connecting flight boarding pass? (US domestic, Delta) Would mask law helps prevent racial and cultural conflicts in the medieval times? For example: int x = 5; if ( x = 6 ) printf("x equals 6\n"); This code prints out x equals 6! The eof() method of an istream works just like C's feof(). 4.3 Leaving characters in the input buffer C input (and output) functions buffer data. One Itemize problem How to check whether a partition is mounted by UUID?

What are options to increase difficulty? Be sure to read their descriptions carefully. 3.4 Not leaving room for the null terminator A C string must have a null terminator at the end of the meaningful data in because the line after that scanf did get printed It is something else in my code --algorithm part grrrr I am going to try fix it now –nanobots Feb 19 '14 String Errors 3.1 Confusing character and string constants 3.2 Comparing strings with == 3.3 Not null terminating strings 3.4 Not leaving room for the null terminator 4.

I hope this helps! Another possibility is that '\n' in the output stream might trigger a flush. This method does seem to work with some C compilers, but is completely unportable! This means that an array of 10 integers defined as: int a[10]; has valid indices from 0 to 9 not 10!

scanf("%d") reads the 1 and the 5, interpreting them as the number 15, but the newline character is still in the input buffer. I'm expecting it to printf, then scanf for user input like so: Enter the box length: (waits for user int input; ex. 8 + "Enter") Enter the box width: ... share|improve this answer answered Sep 19 '10 at 9:21 rursw1 2,26722461 add a comment| up vote 0 down vote calling getchar() before scanf will also purge the stored line break. This means that often the ampersand address operator is required to compute the addresses.

I used a solution that I happened to already have on my laptop on an exam. Scanf: Shape. One way is the following: #include int main() { FILE * fp = fopen("test.txt", "r"); char line[100]; while( 1 ) { fgets(line, sizeof(line), fp); if ( feof(fp) ) /* check A common mistake is to not allocate room for this extra character.

My boss asks me to stop writing small functions and do everything in the same loop Starting collaboration through first e-mail. The %s format can overwrite the destination string. The blank causes scanf() to skip white space (including newlines) before reading the character. Should an arrow for "update" point up or down?

Why did the Winter Soldier kill these characters? All rights reserved. Preloop iteration: Scanf: Shape.