First of all, i have to make it clear that i am not asking anyone to do my homework.
All i want is, do anyone have sample C code that change all the lower case chacter to upper case and vis versa.
For example, a file that will contain all the characters, space and punctation, the C code will take in the file and change all the upper case to lower and lower case to upper case instead of using the toupper() and to lower().
input => This is an Example.
output => tHIS IS AN eXAMPLE.