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int check_vowel(char a) { if (a >= 'A' && a <= 'Z') a = a + 'a' - 'A'; /* Converting to lower case or use a = a + 32 */ if (a == 'a' || a == 'e' || a == 'i' || a == 'o' || a == 'u') return 1; return 0; }