C Program to delete vowels in a string.

C Strings:
Write a C Program to delete a vowel in a given string.
In this program, We use the pointers to position the characters.check_vowel() function checks the character is vowel or not, if the character is vowel it returns true else false.
Example output:Given string: Check vowel
Output is: Chck vwl
Read more about C Programming Language . and read the C Programming Language (2nd Edition). by K and R.

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#define TRUE 1
#define FALSE 0

int check_vowel(char);

char string[100], *temp, *pointer, ch, *start;
printf("nnEnter a stringn");
temp = string;
pointer = (char*)malloc(100);

if( pointer == NULL )
printf("Unable to allocate memory.n");

start = pointer;

ch = *temp;

if ( !check_vowel(ch) )
*pointer = ch;
*pointer = '';

pointer = start;
strcpy(string, pointer); /* If you wish to convert original string */

printf("String after removing vowels is "%s"n", string);

return 0;

int check_vowel(char a)
if ( a >= 'A' && a <= 'Z' )
a = a + 'a' - 'A';

if ( a == 'a' || a == 'e' || a == 'i' || a == 'o' || a == 'u')
return TRUE;

return FALSE;
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