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

  1. #1
    Registered User
    Join Date
    Sep 2009

    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.

    #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')
    	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...

  2. #2
    Registered User cph's Avatar
    Join Date
    Sep 2008
    #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;
            if (ch == '\n') {
        } while (cnt < max);
        buf[cnt] = '\0';

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