Code Snippet: User Input-Single Line
From Coder Merlin
Revision as of 15:10, 11 September 2019 by Nerdofcode (talk | contribs) (Added Common Lisp single-line user-input)
Within these castle walls be forged Mavens of Computer Science ...
— Merlin, The Coder
Reading a single line of text from the console[edit]
- Note: Input read from the console is terminated with a ^D (Control-D) which indicates the end-of-file.
Swift[edit]
// Read a single line of input from the console
let line = readLine() // This will return an optional string
if line != nil { // Let's check if it's not nil, if so, it's really a string
let text = line! // Unwrap the string
print("You typed: \(text)") // Print the string
}
// Read a single line of input from the console (syntactic sugar)
if let text = readLine() {
print("You typed: \(text)")
}
Python[edit]
try:
text = input()
except:
text = ""
print("You typed: %s" %text)
C[edit]
#include <stdio.h>
int main(void){
char line_buffer[64]; // Declare character array capable of holding 63 characters
// Read input from stdin via fgets
// check fgets return for NULL if EOF is passed
if(fgets(line_buffer,64,stdin) == NULL){
return 0; // Indicate successful run to the OS
}
printf("You typed: %s\n",line_buffer); //Output input
return 0; // Indicate a successful run to the OS
}
Common Lisp[edit]
(defvar input)
(setq input (read-line))
(loop while (not input)
do (setq input (read-line))
)
(format t "You typed: ~(~s~) ~%"
input)