void check_pass(char pass[100]) { int i; for (i=0;i='A' && pass[i]<='Z') { printf ("You password has to contain at least one lowercase letter."); break; } else if (pass[i]>='a' && pass[i]<='z') { printf ("Your password has to contain at least one uppercase letter."); break; } else if (pass[i]>=!'0' && pass[i]<=!'10') { printf ("Your password has to contain at least one number."); break; } } } int main () { char password[100]; printf ("Enter a password:\n"); gets(password); check_pass(password); }