Program in C to delete vowels from a string in c

Program in C to delete vowels from a string in c:

Vowels in English literature are the letters a,e,i,o,u. Remember that in a computer the characters are stored as ASCII values hence a and A both are different characters for the compiler. We would hence have to scan for both the lowercase and uppercase vowels if any in the string and delete it.

APPROACH 1: Using user-defined function:

While traversing the char array, we call the function find_vowel to return a flag i.e value 0 or 1 which would let us know if the

Code:

#include <stdio.h>
#include <string.h>
int find_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;   //It is a vowel
else
return 0;   //It is not a vowel
}
int main()
{
char str[100], temp[100];
int i, j;
printf("Enter a string: \n");
fgets(str, 100, stdin);
for(i = 0, j = 0; str[i] != '\0'; i++)
{
if(find_vowel(str[i]) == 0)
{
temp[j] = str[i];                           //It is not a vowel
j++;
}
}
temp[j] = '\0';  //terminate the string
strcpy(str, temp);    //modifying the original string with vowels deleted.
printf("String after deleting vowels: %s\n", str);
return 0;
}

Output:

Enter a string: How are you?

String after deleting vowels: Hw r y?

APPROACH 2: Using pointers

Here the approach is the same as above, however, it is used in conjunction with pointers.

Code:

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int find_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;   //It is a vowel
else
return 0;   //It is not a vowel
}
int main()
{
char *string, *temp, *strptr, ch, *start;
int size = 100;
printf("Enter a string\n");
string = (char*)malloc(size);
getline(&string, &size, stdin);
temp = string;
strptr = (char*)malloc(100);
start = strptr;
while(*temp)
{
ch = *temp;
if ( !find_vowel(ch) )
{
*strptr = ch;
strptr++;
}
temp++;
}
*strptr = '\0';
strptr = start;
strcpy(string, strptr);
free(strptr);
printf("String after removing vowels: %s\n", string);
return 0;
}

Output:

Enter a string How do you do ?

String after removing vowels: Hw d y d ?