• C

Outputing Capitals

i have to create a program that determines whether the character is a capital letter or not.
#include <stdio.h>

void main (void){

char  c;
void chara (char);

printf("Please enter a character: ");
scanf("%c", &c);
fflush(stdin);
if ((c>= 'A') && (c<='Z'))
      printf("true\n");
else printf("False\n");
}

This code works fine. however when i try to put it into its own function it does not as shown in the code below.

#include <stdio.h>

void main (void){

char  c;
void chara (char);

printf("Please enter a character: ");
scanf("%c", &c);
fflush(stdin);
chara(char);
}

void chara (char c){
if ((c>= 'A') && (c<='Z'))
      printf("true\n");
else printf("False\n");

}

i want to be able to create a program that reads in a sequence and outputs only uppercase characters.

any ideas? cheers!
pete420Asked:
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rstaveleyCommented:
With a bug fix on your function call to chara - the parameter is c - your code works OK in GCC 3.2 and C 7.1. I made you main function return int, because that's what standards like it to do, but otherwise you code was OK.

--------8<--------
#include <stdio.h>

int main() {
char  c;
void chara (char);
printf("Please enter a character: ");
scanf("%c", &c);
fflush(stdin);
chara(/*char*/c);
}

void chara (char c){
if ((c>= 'A') && (c<='Z'))
     printf("true\n");
else printf("False\n");
}
--------8<--------
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Eric-KCommented:
I don't understand your purpose ... Is your objective to have the result, or to learn how to do it?

If all you want is to convert a string, you can use the standard library function "toupper()" which converts any character to its upper case equivalent.  Thus, you could write the following function to convert a whole string:

/* Note: this code modifies the callers original string */
void CapString(char *string)
{  
     int i;

     for(i=0; string[i]; i++)
     {
         string[i]=toupper(string[i]);
     }
}

if what you wanted was to understand how to implement toupper itself, well you're halfway there with your original coding example ... once you discriminate if a letter is upper or lower case, then instead of printing a true or false, you perform the conversion by adding the difference of the ASCII code value between upper and lower case characters
that is:

char toupper(char c)
{
    if ((c>= 'a') && (c<='z'))
    {
        c += ('A' - 'a');
    }

    return(c);
}


Hope this helps

Eric-K
     
0
pete420Author Commented:
thanx for the post,
the point of the program was to input a sentence then scan through it and only output the capital letters. i had the program working with the post b4 yours but i appreciate the more knowledge you provided.
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