How do I filter out garbage from between 'Z' and 'a' in ASCII?

Question

#include <stdio.h>

void main()
{
    char ch;

    clrscr();
    ch = 'A';
    while(ch <= 'z')
    {
       printf("%c", ch);
       ch++;
    }
    getch();
 }

How do I remove garbage like [, ], ', \, etc. from the output of this program?

Please show you're code, otherwise we're just throwing guesses. — Federico klez Culloca, Oct 02 '19 at 11:58
Can you bit a bit more specific? Also, can you show use some code that you've already tried? Stack Overflow is not a general-purpose code-writing service. — Adrian Mole, Oct 02 '19 at 11:58
Read [ask], then edit your question to comply. You will get better help that way. — ryyker, Oct 02 '19 at 12:01
@FedericoklezCulloca #include void main() { char ch; clrscr(); ch= 'A'; while(ch<= 'z') { printf("%c",ch); ch++; } getch(); } — HuHu, Oct 02 '19 at 12:06
Also, please, if experienced users change your question's tags, there's a reason for that. Don't roll their changes back. — Federico klez Culloca, Oct 02 '19 at 12:14
Please [edit] your question. Don't forget to [format](https://meta.stackoverflow.com/questions/251361/how-do-i-format-my-code-blocks) it properly. — n. m. could be an AI, Oct 02 '19 at 12:14
And please [do not use `void main()`](https://stackoverflow.com/questions/9356510/int-main-vs-void-main-in-c). — n. m. could be an AI, Oct 02 '19 at 12:17
And don't build/run the program anywhere that's not ASCII (notably, EBCDIC systems will produce no output). — Toby Speight, Oct 02 '19 at 15:33
What do you consider to be "garbage"? Anything for which `isalpha()` returns false? If so, that should be your clue... — Toby Speight, Oct 02 '19 at 15:34

score 3 · Accepted Answer · edited Jan 24 '20 at 04:49

Like mentioned in a comment skip everything between Z for example this way:

#include "stdio.h"
int main(){
    char ch = 'A';
    while(ch <= 'z'){
        if(ch <= 'Z' || ch >= 'a'){
            printf("%c", ch);
        } 
        ch++;
    } 
    printf("\n");
    return 0;
}

or alternatively use a for loop since you know the beginning and end of the range of values:

#include "stdio.h"
int main(){
    char ch;
    for(ch = 'A'; ch <= 'z'; ch++){
        // loop through range of ASCII values from 'A' to 'z', upper case
        // and lower case letters, and print out only alphabetic characters.
        if(ch <= 'Z' || ch >= 'a'){
            // character is in range of 'A' thru 'Z' or 'a' thru 'z'.
            printf("%c", ch);
        } 
    } 
    printf("\n");
    return 0;
}

or alternatively use the isalpha() function to detect if a character is alphabetic or not.

#include "stdio.h"

int main() {
    char ch;
    // loop through range of ASCII values from 'A' to 'z', upper case
    // and lower case letters, and print out only alphabetic characters.
    for (ch = 'A'; ch <= 'z'; ch++)  isalpha (ch) && printf ("%c", ch);
    printf("\n");
    return 0;
}

How do I filter out garbage from between 'Z' and 'a' in ASCII?

1 Answers1