C Program to find number of vowels in string

How to define new user data type in C program?

Custom data type can be created using predefined data type in c programmin.

typedef int bool; 
enum { false, true };

Initialization starts from 0, so false is 0 and true is 1.

Finds number of vowels in any string in C program

This C program is used to find the number of vowels used in the input string.

typedef and enum keywords are used to define new user type bool.

 #include <stdio.h>                                                           
#include <string.h>                                                           
                                                                                
typedef int bool;                                                               
enum { false, true };                                                           
                                                                                
bool is_vowel(char);                                                            
                                                                                
int main()                                                                      
{                                                                               
  char str[100];                                                                
  int i, count = 0;                                                             
                                                                                
  printf("Enter a string: ");                                                   
  gets(str);                                                                    
                                                                                
  for(i = 0; str[i] != '\0'; i++) {                                             
    if(is_vowel(str[i]) == true) {                                              
     //if a character is vowel                                                  
      count++;                                                                  
    }                                                                           
  }                                                                             
                                                                                
  printf("Number of vowels in string: %d\n", count);                            
  return 0;                                                                     
}                                                                               
                                                                                
                                                                                
bool is_vowel(char c)                                                           
{                                                                               
  switch(c) {                                                                   
    case 'a':                                                                   
    case 'A':                                                                   
    case 'e':                                                                   
    case 'E':                                                                   
    case 'i':                                                                   
    case 'I':                                                                   
    case 'o':                                                                   
    case 'O':                                                                   
    case 'u':                                                                   
    case 'U':                                                                   
      return true;                                                              
    default:                                                                    
      return false;                                                             
  }                                                                             
}                                                              
                                                                                  
Compilation:

When compiling this program, throws below warning message due to gets function usage in the program but we can execute the program.

$ cc no_of_vowels.c
no_of_vowels.c: In function ‘main’:
no_of_vowels.c:15:3: warning: implicit declaration of function ‘gets’ [-Wimplicit-function-declaration]
   gets(str);
   ^~~~
/tmp/ccuJYVvE.o: In function `main':
no_of_vowels.c:(.text+0x2b): warning: the `gets' function is dangerous and should not be used.
Output:
$ ./a.out 
Enter a string: alphabet
Number of vowels in string: 3
$ ./a.out 
Enter a string: testing inprogress
Number of vowels in string: 5


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