View Compilation Error

0_0_14517522_21890.cpp: In function 'int main()':
0_0_14517522_21890.cpp:40:107: error: cast from 'const char*' to 'int' loses precision [-fpermissive]
    if ((int)str[i] < (int)'A' || (int)(str[i] > (int)'Z' && (int)str[i] < (int)'a') || (int)str[i] > (int)"z")
                                                                                                           ^