void main ()
printf("enter any character:- ");
printf("this is a vowel");
printf("this is not a vowel");
Write a function occur(string, char) that returns the number of occurrences of that character in the string.
Write a function ustrcat(s1, s2, i) that concatenates contents of string s2 at the i position of string s1
Write a Program to accept days & convert it into equivalent no. of years, months, weeks & remaining days.