Prerequisite: Flex (Fast lexical Analyzer Generator) Given a string containing both vowels and consonants, write a LEX program to count the number of vowels and consonants in given string. Examples:
Input: Hello everyone Output: Number of vowels are: 6 Number of consonants are: 7 Input: This is GeeksforGeeks Output: Number of vowels are: 7 Number of consonants are: 12
Approach- Approach is very simple. If any vowel is found increase vowel counter, if consonant is found increase consonant counter otherwise do nothing. Below is the implementation:
C
%{ int vow_count=0;
int const_count =0;
%} %% [aeiouAEIOU] {vow_count++;} [a-zA-Z] {const_count++;} %% int yywrap(){}
int main()
{ printf ("Enter the string of vowels and consonants:");
yylex();
printf ("Number of vowels are: %d\n", vow_count);
printf ("Number of consonants are: %d\n", const_count);
return 0;
} |
Output:
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