What will the following loop do: 'while (1) { putchar(c); c = getchar(); }'?
Understand the Problem
The question is asking about the behavior of a specific loop written in C programming language. The loop continuously reads a character input and prints it until an End of File (EOF) is reached, describing how the loop iterates indefinitely while processing input.
Answer
The loop repeats every character input until stopped.
The loop will continuously read characters from standard input and echo them to standard output until interrupted.
Answer for screen readers
The loop will continuously read characters from standard input and echo them to standard output until interrupted.
More Information
This loop functions as an echo, continuously taking each character directly inputted and immediately outputting it. It persists until interrupted by an external action, such as a user signal or end of file (EOF).
Tips
A common error is thinking that the loop will stop automatically; however, it needs an interruption like a Ctrl-D (EOF) in UNIX systems or Ctrl-Z in Windows.
Sources
- Behavior of getchar() and putchar() - C Board - cboard.cprogramming.com
- putchar() and getchar() loop explanation - Stack Overflow - stackoverflow.com
- putchar(), getchar() function in C | C File Handling - fresh2refresh.com - fresh2refresh.com
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