c++ how to check if character is a letter code example

Example 1: check if character in string is alphabet c++

#include<stdio.h>
#include<ctype.h>

int main() {
   char val1 = 's';
   char val2 = '8';

   if(isalpha(val1))
   printf("The character is an alphabet\n");
   else
   printf("The character is not an alphabet\n");

   if(isalpha(val2))
   printf("The character is an alphabet\n");
   else
   printf("The character is not an alphabet");

   return 0;
}

Example 2: check if char in string c++

std::string s = "hell[o";
if (s.find('[') != std::string::npos)
    ; // found
else
    ; //