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fn main() {
let str = "perl";
proc(str);
let str2 = "book";
proc(str2);
let str3 = "goodmorning";
proc(str3);
}
fn is_vowel(c: char) -> bool {
if c == 'a' ||
c == 'e' ||
c == 'i' ||
c == 'o' ||
c == 'u' {
return true;
}
return false;
}
fn proc(str : &str) {
println!("Input: str = {str}");
let mut cnt = 0;
for c in str.chars() {
if is_vowel(c) {
cnt += 1;
}
}
print!("Output:");
if cnt % 2 == 0 {
println!(" true");
} else {
println!(" false");
}
}
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