How to use getchar/gets to store chars in an array, all upper case, in a set amount?

RandomEvil · 11-04-2009, 11:34 PM

Hello there. This is just part of error checking in a much larger program, where I have to use only getchar (if even) / gets to manipulate the array to only store uppercase A-Z characters, with min number of characters being 2, max 10. I guess I'm still not comfortable using these functions. No string library functions may be use. What I have so far is below. Any help would be highly appreciated, thanks in advance.

Code:

#include <stdlib.h>
#include <stdio.h>

int main()
{
	char string[11]; /* gets will replace newline with null, so don't have to initialize
						string[10] to null*/
	int iochar;


	printf("Input string with uppercase A-Z characters, min 2 max 10:\n");
	
	while(iochar = getchar())
	{
		if(iochar >= 'A' && iochar <= 'Z')
		{
		gets(string);
		}
	}


	puts(string); /* testing string */

}

What I have above doesn't do anything, I was just messing around with getchar and such. I tried to set the while loop as while(iochar = getchar() != '\n'), but that gave me some erroneous results. I've also tried setting an if statement to check for lowercase characters, and a printf call to tell the user that the string can't be lowercase, but it would be print that statement (can't be lowercase) every time a single lower case is found. This is just one part of my program that I can't seem to figure out...

cph · 11-05-2009, 12:30 AM

suggestion

Code:

#include <stdio.h>

int main (void)
{
    int       cnt = 0;
    const int max = 10;
    char      buf[11];
    int       ch;

    do {
        ch = getchar();
        if (ch >= 'A' && ch <= 'Z') {
            buf[cnt] = (char)ch;
            ++cnt;
        }
        if (ch == '\n') {
            break;
        }
    } while (cnt < max);
    buf[cnt] = '\0';
    puts(buf);

    return(0);
}

11-04-2009, 11:34 PM	#1
RandomEvil Registered User Join Date: Sep 2009 Posts: 7	How to use getchar/gets to store chars in an array, all upper case, in a set amount? Hello there. This is just part of error checking in a much larger program, where I have to use only getchar (if even) / gets to manipulate the array to only store uppercase A-Z characters, with min number of characters being 2, max 10. I guess I'm still not comfortable using these functions. No string library functions may be use. What I have so far is below. Any help would be highly appreciated, thanks in advance. Code: #include <stdlib.h> #include <stdio.h> int main() { char string[11]; /* gets will replace newline with null, so don't have to initialize string[10] to null/ int iochar; printf("Input string with uppercase A-Z characters, min 2 max 10:\n"); while(iochar = getchar()) { if(iochar >= 'A' && iochar <= 'Z') { gets(string); } } puts(string); / testing string */ } What I have above doesn't do anything, I was just messing around with getchar and such. I tried to set the while loop as while(iochar = getchar() != '\n'), but that gave me some erroneous results. I've also tried setting an if statement to check for lowercase characters, and a printf call to tell the user that the string can't be lowercase, but it would be print that statement (can't be lowercase) every time a single lower case is found. This is just one part of my program that I can't seem to figure out...
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