c++ - How to prevent integers being assigned to char strings? -

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i new @ programming in c++, , have come across problem can't solve. trying create error message whenever user inputs integers instead of characters. problem is, integers being accepted , assigned char strings reason.. thought point of defining strings int or char etc. let compiler know values accepted. let me know i'm doing wrong?

int x, input = false; char check[size], str[size];  cout << "enter 1 word: "; cin >> str;  while (!cin) {     cout << "\nerror: must enter 1 word characters. \n\nre-enter: ";     cin.clear();     cin.ignore(256, '\n');     cin >> str; }

a char 1-byte interpretation of integer according ascii value (i.e. integer 68 ascii value character 'd'). other ascii values can found here.

for code, need create function loops through inputted string , checks see if of characters not letters.

for example:

for (int = 0; <  strlen(str); i++) {     if ((int)str[i] < 65 || ((int)str[i] > 90 && (int)str[i] < 97) ||  (int)str[i] > 122)     {         // handle error     } }

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