Program keeps printing a zero byte? - c

Question

I am trying to create a program that removes the vowels from a sentence. However, my program keeps failing because it keeps printing zero byte in the string. Would anyone be able to show me where I am going wrong?
#include <stdio.h>
int remove_all_vowels(int character);
int main(void) {
int character = getchar();
while (character != EOF && character != '\0') {
int new_character = remove_all_vowels(character);
putchar(new_character);
character = getchar();
}
return 0;
}
int remove_all_vowels(int character) {
if (character == 'a' || character == 'e' || character == 'i' || character
== 'o' || character == 'u') {
return 0;
} else {
return character;
}
}

Answer 1

Your issue (outputting null characters) comes from the fact that you unconditionally putchar(3) the result of remove_all_vowels, which returns 0 (null character) when given character is a vowel.
To replace vowels with spaces:
You can simply change return 0; in remove_all_vowels to return ' ';
To completely remove vowels:
I would suggest having a function just to help you check against vowels rather than having it act like a transformation over a char, which is really pythonest.
Example of code:
int is_vowel(int character) {
return (
character == 'a' || character == 'e' || character == 'i'
|| character == 'o' || character == 'u'
);
}
// Then, in your main...
...
if (!is_vowel(character))
putchar(character);

Answer 2

your program works fine here
https://www.onlinegdb.com/online_c_compiler
Can give a screenshot whats the problem of your compiler?
#include <stdio.h>
#include <string.h>
int check_vowel(char);
int main()
{
char s[100], t[100];
int c, d = 0;
printf("Enter a string to delete vowels\n");
gets(s);
for(c = 0; s[c] != '\0'; c++) {
if(check_vowel(s[c]) == 0) { // If not a vowel
t[d] = s[c];
d++;
}
}
t[d] = '\0';
strcpy(s, t); // We are changing initial string. This is optional.
printf("String after deleting vowels: %s\n", s);
return 0;
}
int check_vowel(char ch)
{
if (ch == 'a' || ch == 'A' || ch == 'e' || ch == 'E' || ch == 'i' || ch == 'I' || ch =='o' || ch=='O' || ch == 'u' || ch == 'U')
return 1;
else
return 0;
}