Function for character check character exit or not

Function for character check: 

character exit or not, is character more then 18, is number, is another character?

 function for character check character exit or not,more then 18,number,another

// function for character check character exit or not,more then 18,number,another
//md. sohidul islam shoikat
int character_check(char *p){
n = 0;
for(i=0 ;i < strlen(p);i++){
   /* Comparing the ASCII values of characters
   with the values of the characters entered*/
if( *(p+i) >=65 && *(p+i) <=90 || *(p+i) >= 95 && *(p+i) <=122 || *(p+i) == 32){
            n++;
}
}
/* Check whether the length of the input exceeds
the limit of the memory provided*/
if(strlen(p)>18){
printf("\a\n\t\tERROR: LENGTH EXCEEDED BEYOND 18\n");
return 0;
}
if((*(p+0)==32||*(p+1)==32) && (strlen(p)==1||strlen(p)==2)){
printf("\a\n\tERROR:FIELD CANNOT BE LEFT BLANK");
return 0;
}
if(n != strlen(p)){
printf("\a\n\t\tERROR: CAN ACCEPT ALPHABETS A-Z ONLY");
return 0;
}
else{
return 1;
}
}