Covert Lowercase characters to Uppercase Characters
Get a String and convert the lower case characters to upper case Characters
int i = 0;
if(str[i]>=97 && str[i]<=122)
Get a String using fgets() function.
Str -> reads the string and stores it in str.
50 -> reads maximum of 50 characters
stdin-> reads character from keyboard
ASCII value of A to Z is 65 - 90 and a to z is 97 to 122.
for loop iterates and check each character whether it is s a to z, if it is in a to z then decrement it with 32 to get Upper Case.