Isalpha Function Issue.
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In the below code, I am attempting to count the number of letters and number of words in a phrase. In researching the return values of isalpha(), I noted that when a letter is present the first character isalpha() output is 1. But the second character isalpha() output is 2? The phrase that was input into this example was the following: How do you organize? Can someone help me with why I am not getting uniform output for the "H" character and the "o" character?
#include <stdio.h>
#include <ctype.h>int main(void)
{
int ch;
float avg = 0;
int spaces = 0;
int letters = 0;
int test = 0;
int ltrcnt = 0;
int spccnt = 0;
while((ch = getchar()) != '\n')
{
test = isalpha(ch);
if(isalpha(ch) == 2)
{
ltrcnt++;
}
if(isspace(ch) == 8)
{
spccnt++;
}
}
printf("The Number Of Words Are %d , The Number Of Letters Are %d ",(spccnt+1),ltrcnt);} -
In the below code, I am attempting to count the number of letters and number of words in a phrase. In researching the return values of isalpha(), I noted that when a letter is present the first character isalpha() output is 1. But the second character isalpha() output is 2? The phrase that was input into this example was the following: How do you organize? Can someone help me with why I am not getting uniform output for the "H" character and the "o" character?
#include <stdio.h>
#include <ctype.h>int main(void)
{
int ch;
float avg = 0;
int spaces = 0;
int letters = 0;
int test = 0;
int ltrcnt = 0;
int spccnt = 0;
while((ch = getchar()) != '\n')
{
test = isalpha(ch);
if(isalpha(ch) == 2)
{
ltrcnt++;
}
if(isspace(ch) == 8)
{
spccnt++;
}
}
printf("The Number Of Words Are %d , The Number Of Letters Are %d ",(spccnt+1),ltrcnt);} -
isalpha returns zero if the given character is not an alphabet. Returns non-zero if it is alphabet. And may return '1' if the alphabet is of upper case, and '2' if it is lower case.
Yes, note the following defines from ctype.h
#define _UPPER 0x1 /* upper case letter */
#define _LOWER 0x2 /* lower case letter */
#define _DIGIT 0x4 /* digit[0-9] */
#define _SPACE 0x8 /* tab, carriage return, newline, */
/* vertical tab or form feed */
#define _PUNCT 0x10 /* punctuation character */
#define _CONTROL 0x20 /* control character */
#define _BLANK 0x40 /* space char */
#define _HEX 0x80 /* hexadecimal digit */#define _LEADBYTE 0x8000 /* multibyte leadbyte */
#define _ALPHA (0x0100|_UPPER|_LOWER) /* alphabetic character */ -
Yes, note the following defines from ctype.h
#define _UPPER 0x1 /* upper case letter */
#define _LOWER 0x2 /* lower case letter */
#define _DIGIT 0x4 /* digit[0-9] */
#define _SPACE 0x8 /* tab, carriage return, newline, */
/* vertical tab or form feed */
#define _PUNCT 0x10 /* punctuation character */
#define _CONTROL 0x20 /* control character */
#define _BLANK 0x40 /* space char */
#define _HEX 0x80 /* hexadecimal digit */#define _LEADBYTE 0x8000 /* multibyte leadbyte */
#define _ALPHA (0x0100|_UPPER|_LOWER) /* alphabetic character */Andrew, Ahh, Thank you for directing me to the defines. Since I am an newbie, I have never looked in the header file. Thank you for the answer as well.
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isalpha returns zero if the given character is not an alphabet. Returns non-zero if it is alphabet. And may return '1' if the alphabet is of upper case, and '2' if it is lower case.
Cool_Dev, Thank you for the answer.
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In the below code, I am attempting to count the number of letters and number of words in a phrase. In researching the return values of isalpha(), I noted that when a letter is present the first character isalpha() output is 1. But the second character isalpha() output is 2? The phrase that was input into this example was the following: How do you organize? Can someone help me with why I am not getting uniform output for the "H" character and the "o" character?
#include <stdio.h>
#include <ctype.h>int main(void)
{
int ch;
float avg = 0;
int spaces = 0;
int letters = 0;
int test = 0;
int ltrcnt = 0;
int spccnt = 0;
while((ch = getchar()) != '\n')
{
test = isalpha(ch);
if(isalpha(ch) == 2)
{
ltrcnt++;
}
if(isspace(ch) == 8)
{
spccnt++;
}
}
printf("The Number Of Words Are %d , The Number Of Letters Are %d ",(spccnt+1),ltrcnt);} -
Andrew, Ahh, Thank you for directing me to the defines. Since I am an newbie, I have never looked in the header file. Thank you for the answer as well.
And you don't have to look there, what matters is the documentation: isalpha return a boolean result, either zero or non-zero; since the different non-zero values are not documented, you should not rely on them. Nor on any observation you may make, not in a .h file and not when running a test app. :)
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Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.