A simple program to ask the user to give a character and then the program will if the given character is a vowel or not using C programming language.
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printf("\tCheck Vowel in C\n\n");
printf("\tGive Character : ");
printf("\t%c is a vowel.\n\n", toupper(ch));
printf("\t%c is not a vowel.\n\n", toupper(ch));
printf("\tEnd of Program");