Solution for Exercise 17-6
ex1706
#include <stdio.h> int main() { char input[64]; char ch; int x = 0; printf("Type in some text: "); fgets(input,63,stdin); while(input[x] != '\n') { ch = input[x] & 223; putchar(ch); x++; } putchar('\n'); return(0); }
Notes
* The sample output varies between computer systems. On a PC, you may see this:
On a Mac, this could be the output:
This could be due to the character set used by the terminal. On a PC, ASCII code 0 may display as a space, whereas on a Mac it doesn't display at all. Typing in non-alpha characters has a similar effect:
The strange codes are due to the effect the bitwise-AND mask has on the character's ASCII code.
* The ASCII code for the space character is 32. If you run the solution from Exercise 17-5 using that value, here is what you see for output:
The result of the 223 AND mask on the space character is to change its code to zero.
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