fork download 
  1. /* K&R Exercise 4-8 */
  2. /* Steven Huang */
  3.  
  4. #include <stdio.h>
  5.  
  6. int buf = EOF; /* buffer for ungetch */
  7.  
  8. int getch(void) /* get a (possibly pushed back) character */
  9. {
  10.   int temp;
  11.  
  12.   if (buf != EOF) {
  13.     temp = buf;
  14.     buf = EOF;
  15.   } else {
  16.     temp = getchar();
  17.   }
  18.   return temp;                          
  19. }
  20.  
  21. void ungetch(int c) /* push character back on input */
  22. {
  23.   if(buf != EOF)
  24.     printf("ungetch: too many characters\n");
  25.   else       
  26.     buf = c;
  27. }
  28.  
  29. int main(void)
  30. {
  31.   int c;
  32.  
  33.   while ((c = getch()) != EOF) {
  34.     if (c == '/') {
  35.       putchar(c);
  36.       if ((c = getch()) == '*') { 
  37.         ungetch('!');
  38.       }         
  39.     } 
  40.     putchar(c);               
  41.   }
  42.   return 0;
  43. }
Success #stdin #stdout 0.01s 1724KB
comments (?)
stdin 


			

					
			
			

				
	
		
		
	
		
		 stdout
			
	

		

	

		
	 
	
	
			

					
			
			
			
			
			
			
			
			

			
			
			
		

	
		
		

			


			                        
			
			

				

	
					
					 https://ideone.com/u0oKN
					
					
					
					
					

												

												
						
						

					

					
					
					

						
language:

						
C (gcc 8.3)

					

					

						
created:
								
						
14 years ago

					

					

						
visibility:

						

							 public																												
							
							

								
							

						

					

										
										

					
					 Share or Embed source code
					
					
					
					

						
						
						
						
						
						
						
					

					
						
	
	
	
	
					
					
					
					
					 
					
					
					
					 
					
					
					
					
					
					

					

					

					
						
					

					


	
Discover > Sphere Engine API

	
The brand new service which powers Ideone!

	
	
Discover > IDE Widget

    
Widget for compiling and running the source code in a web browser!