toupper

This question already has an answer here: How do I lowercase a string in C? 5 answers I have a char foo[SIZE]; //(string) and have inputed it correctly using %s (as in it printfs the correct input), but now want to set it to lowercase. So I tried using if (isupper(*foo)) *foo=tolower(*foo); ie when I do: printf("%s" foo); //I get the same text with upper case The text does not seem to change. Thank you. foo isn't a pointer, so you don't want to use it as one. You also don't have to check whether a character is an upper-case letter before using tolower -- it converts upper to lower case, and

This is what I have so far. I'm just trying to understand how to implement this function. char toupper(char s[]) { s[50] = "hello"; int i = 0; int len; len = strlen(s); while(i < len) //converting to upper until the length is reached. { s[i] = putchar(toupper(s[i])); i++; } return s[i]; } It seems that OP wants to convert a string to upper case. Now here somehow OP messed up the assignment part. The code can be boiled down to assigning uppercase characters to the string passed. But here, the code is doing something that compiler complains about. invalid conversion from 'const char*' to 'char'

I am supposed to ask the user for two file names (input and output files). The contents from the input file should be read and the first letter of each sentence should be made uppercase while every other letter should be made lowercase. The results should then be stored in the output file. I am aware that there are ways of using the toupper and tolower functions that include pointers, arrays, or even ASCII values of chars but I am trying to get this code to work by using if/else and while statements, as well as boolean statements. I have had various results ranging from all the letters being

I have a list [String] the task ist to remove those elements in the list, which have "q" or "p" and then capitalize all letters in the list with toUpper. What I tried yet is as follow: delAndUpper :: [String] -> [String] delAndUpper myList = filter (\x -> not('p' `elem` x || 'q' `elem` x)) myList It removes the unwanted elements from the list properly, however I can't apply toUpper on this list since the type of toUpper is Char. I tried it with map and it does not work. delAndUpper myList = map toUpper (filter (\x -> not('p' `elem` x || 'q' `elem` x)) myList) I know, that toUpper in this line