I am trying to check if there is a space in an input line.
I have indexed the input but I got an error: "Expected ';' expected ')' "
string mike20;
int count = 0;
while (getline(cin, mike20))
for (mike20[0]); (isspace(mike20[0]); ++mike20[0])
return 0;
Firstly they are syntax error in your code, it is more like that for (mike20[0]; isspace(mike20[0]); ++mike20[0]). Secondly you seem don't understand how the for loop work. As is nothing change, so the loop is infinite.
You need a variable to browse each char of the string and do your test on each of them.
int cursor;
for (cursor = 0; cursor < number_of_char_in_mike20; ++cursor)
{
isspace(mike20[i]);
}
this code is incomplet you need to declare and initialise the number_of_char_in_mike20 variable and the isspace() function must be define if is not.
PS: don't forget braces {} for while loop and for loop, without only the first instruction is repeated.
for (initialisation(only once); test(each time); increment(each time))
first_instruction; // each time
second_instruction; // after the loop end
third_instruction; // after the loop end
fourth_instruction; // after the loop end
fifth_instruction; // after the loop end
for (initialisation(only once); test(each time); increment(each time))
{
first_instruction; // each time
second_instruction; // each time
third_instruction; // each time
}
fourth_instruction; // after the loop end
fifth_instruction; // after the loop end
I have an issue in one of my functions in my code. I am new to Ruby, so I am unsure of where my syntax error is. My irb is giving me a syntax error related to my end keywords, but I believe the syntax is correct
def function1
print "function 1 \n"
print "Please type 4 lines \n"
i = 0
fptr = (File.new("myFile.txt", "w"))
while i < 4
line = gets
fptr.write(line "\n")
i++
end
fptr.close()
end
This function should print two output lines, open a txt file, take in 4 lines of user input, and write them to the said file.
The problem is that i++ is not valid Ruby. Use i += 1 instead.
So, I'm teaching myself some Golang by making a simple resource management game with ncurses. I'm using this library to connect Golang to ncurses.
I've made a simple text input panel that takes in one character at a time, displays it, and then adds it to a string composing the user's response. Here's what it looks like:
// Accept characters, printing them until end
ch := window.GetChar()
kstr := gc.KeyString(ch)
response := ""
cur := 0
for kstr != "enter" {
// Diagnostic print to get key code of current character
window.Move(0,0)
window.ClearToEOL()
window.MovePrint(0, 0, ch)
// If its a backspace or delete, remove a character
// Otherwise as long as its a regular character add it
if ((ch == 127 || ch == 8) && cur != 0){
cur--
response = response[:len(response)-1]
window.MovePrint(y, (x + cur), " ")
} else if (ch >= 33 && ch <= 122 && cur <= 52) {
window.MovePrint(y, (x + cur), kstr)
response = response + kstr
cur++
}
// Get next character
ch = window.GetChar()
kstr = gc.KeyString(ch)
}
However, the arrow and function keys seem to be coming up as keycodes already associated with the normal a-zA-Z characters. For example, right-arrow comes up as 67 and F1 as 80. Any ideas what I'm doing wrong here, or if there's a better approach to taking in alphanumerics through ncurses? I'd like to avoid ncurses fields and classes as much as possible, because the point here is to learn Golang, not ncurses. Thanks!
If you do not enable the keypad mode, (n)curses will return the individual bytes which make up a special key.
To fix, add this to your program's initialization:
stdscr.Keypad(true) // allow keypad input
which will return special keys such as right-arrow as values above 255. goncurses has symbols defined for those, e.g., KEY_RIGHT.
I am currently just trying to wrap my head around this example question. I don't understand the syntax of it. I don't understand the point of i and how it relates to result
def pow(base, exponent)
result = 1
i = 1
while i <= exponent
result = result * base
i += 1
end
result
end
Any explanation much appreciated!!
while need a do while(i <= exponent) do
i is a counter, you can replace the while for
exponent.times { result = result * base }
this code will execute the number (exponent) times the content of { }
And the result on end is the result of function, in ruby if you don't put a return clause will return the last line executed
I have the following method as part of a password generating program to generate a random password which is then validated.
My problem is that the srand function never meets the validation requirements and keeps looping back to create a new password.
Im posting the code below to ask if anyone has a more efficient way to create the random password so that it will meet validation requirements instead of looping back continously.Thanks.
static bool verifyThat(bool condition, const char* error) {
if(!condition) printf("%s", error);
return !condition;
}
//method to generate a random password for user following password guidelines.
void generatePass()
{
FILE *fptr;//file pointer
int iChar,iUpper,iLower,iSymbol,iNumber,iTotal;
printf("\n\n\t\tGenerate Password selected ");
get_user_password:
printf("\n\n\t\tPassword creation in progress... ");
int i,iResult,iCount;
char password[10 + 1];
char strLower[59+1] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRTUVWXYZ!£$%^&*";
srand(time (0));
for(i = 0; i < 10;i++)
{
password[i] = strLower[(rand() % 52)];
}
password[i] = '\0';
iChar = countLetters(password,&iUpper,&iLower,&iSymbol,&iNumber,&iTotal);
//folowing statements used to validate password
iChar = countLetters(password,&iUpper,&iLower,&iSymbol,&iNumber,&iTotal);
iUpper = countLetters(password,&iUpper,&iLower,&iSymbol,&iNumber,&iTotal);
iLower =countLetters(password,&iUpper,&iLower,&iSymbol,&iNumber,&iTotal);
iSymbol =countLetters(password,&iUpper,&iLower,&iSymbol,&iNumber,&iTotal);
iNumber = countLetters(password,&iUpper,&iLower,&iSymbol,&iNumber,&iTotal);
iTotal = countLetters(password,&iUpper,&iLower,&iSymbol,&iNumber,&iTotal);
if(verifyThat(iUpper >= 2, "Not enough uppercase letters!!!\n")
|| verifyThat(iLower >= 2, "Not enough lowercase letters!!!\n")
|| verifyThat(iSymbol >= 1, "Not enough symbols!!!\n")
|| verifyThat(iNumber >= 2, "Not enough numbers!!!\n")
|| verifyThat(iTotal >= 9, "Not enough characters!!!\n")
|| verifyThat(iTotal <= 15, "Too many characters!!!\n"))
goto get_user_password;
iResult = checkWordInFile("dictionary.txt", password);
if(verifyThat(iResult != gC_FOUND, "Password contains small common 3 letter word/s."))
goto get_user_password;
iResult = checkWordInFile("passHistory.txt",password);
if(verifyThat(iResult != gC_FOUND, "Password contains previously used password."))
goto get_user_password;
printf("\n\n\n Your new password is verified ");
printf(password);
//writing password to passHistroy file.
fptr = fopen("passHistory.txt", "w"); // create or open the file
for( iCount = 0; iCount < 8; iCount++)
{
fprintf(fptr, "%s\n", password[iCount]);
}
fclose(fptr);
printf("\n\n\n");
system("pause");
}//end of generatePass method.
I looked at your code at glance and I think I have found the reasons inspite of which validation requirements aren`t meet.
I suggest you to pay attention to the following parts of your code:
1) char strLower[59+1] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRTUVWXYZ!£$%^&*";
here you should add numbers 0..9, this is one of the reasons why requirements could not be met, because how number can be picked if it isn`t in the set of numbers from which you pick?!
replace it for ex. with:
char strLower[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRTUVWXYZ!£$%^&*0123456789";
2) password[i] = strLower[(rand() % 52)]; - and in this part of the code, replace 52 with total number of symbols in string from which you randomly pick numbers.
I recommend you to replace it with the following code:
password[i] = strLower[(rand() % (sizeof(strLower) / sizeof(char) - 1))];
you could alter your algorithm.
choose at random a number of Upper characeters that is above 2.
choose at random a number of Lower character that is above 2.
choose at random a number of Sybmol character that is above 1.
choose at random a number of Number characters that is above 2.
and then recompose your password with the random items, re-ordered at random. Fill with whatever character you want to pas the verifyThat predicates: >=9 and <= 15.
And please: don't use goto. Make function calls instead.