Changing a word to all uppercase letters in c plus plus?

Answer 1

To change any string to uppercase, loop through each character in the string. If the character is in the range 'a' through 'z', decrement the character by decimal 32 (the difference between ASCII value 'a' and 'A'). The following function shows an example of this:

void to_upper(std::string& str)

{

for(int i=0; i<str.size(); ++i)

if(str[i]>='a' && str[i]<='z')

str[i]-=32;

}