checking if a string contains a letter

I wrote this piece of code but I'm not satisfied at all with it. Could anyone provide me with a better and smarter code to do the trick ?
thanks in advance

Code:

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

int contains_a_letter(char * address)
{
        int i;
        int output;
        output = 1;
        for ( i=0;  address[i]!='\0'; i++ ) {
                                                printf("address[i] : %d\n",address[i]);
                                                if( isalpha( address[i] ) )
                                                  {
                                                    printf("  There is a letter \n");               
                                                output = 0;
                                                  }
                                                  else 
                                                  {
                                                    printf("  There is no letter \n");                     
                                                }       
                                              }
            return(output);
}
 
 main()
{
int result;
char address[32]="2574A4564G54";
 
result = contains_a_letter(address);
printf("result : %d\n", result);
if (result == 0) {
        printf("address contains a letter\n");
                }
else {
        printf("address doest not contain a letter\n");
    }
                       
return 0;
}

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Instead of "output = 0;", do "return 0;"
No point in looping through the rest of the string once you find an alpha.

- make your parameter "const char *address", since you don't modify it
- main() returns int, declare it (this is required in the latest C standard)
- "char address[32]="2574A4564G54";" - don't need to declare the size since you are initializing it - but it doesn't hurt either.

gg

Code:

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bool ContainsLetter(const char* String)
{
  //Abort if no string is passed
  if(String == NULL) return false;

  while((*String) != '\0')
  {
      if(isalpha(*String)) return true;
      String++;
  }

  return false;
}

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