5

Keyboard input

  1. #include <stdlib.h>
  2. #include <stdio.h>
  3.  
  4. main() {
  5.     int age;
  6.  
  7.     printf( "Enter your age: " );
  8.  
  9.     if ( scanf("%d", &age) == 1 )
  10.         printf("Next year you'll be %d.\n", age+1 );
  11.  
  12.     exit( 0 );
  13. }
$ gcc -o age age.c
$ ./age 
Enter your age: 49
Next year you'll be 50.
$ ./age 
Enter your age: ten
$

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