I want to replace all of the Uppercase letters in string with lowercase letters is there any function to do so because the replace function is not giving any result. Here is my code..
for (int i = 0 ; i < string. size() ; i++ ) { if (string[i] >= 65 && string[i] <= 90) { string.replace(string[i] , 1 ,string[i]+32); } } You should read the documentation for replace - first argument is position of the substring to replace, not the character you want to replace.
So, string.replace(i , 1 ,string[i]+32); should work. Personally, I would go with
for(auto& p : string) p=std::tolower(p); Another option is to use transform
#include <algorithm> #include <locale> int main() { std::transform(string.begin(), string.end(), string.begin(), ::tolower); } 
stringhere? Please post a Minimal, Reproducible Example. Note that the 1st argument ofstd::string::replaceshould be the index, not the character.