4

Boolean expressions

Conditional instructions  |  The switch instruction

yesno.c
  1. #include <stdlib.h>
  2. #include <stdio.h>
  3.  
  4. main() {
  5.     char c;
  6.  
  7.     printf( "Enter (y)es or (n)o: " );
  8.  
  9.     if ( scanf("%c", &c ) == 1 )
  10.         if ( c == 'Y' || c == 'y' )
  11.             printf("Yes\n");
  12.         else if ( c == 'N' || c == 'n' )
  13.             printf("No\n");
  14.         else
  15.             printf("What?\n");
  16.     exit( 0 );
  17. }
$ gcc -o yesno yesno.c
$ ./yesno
Enter (y)es or (n)o: y
Yes
$ ./yesno
Enter (y)es or (n)o: n
No
$ ./yesno
Enter (y)es or (n)o: No
No
$ ./yesno
Enter (y)es or (n)o: oui
What?

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