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Convert Const Char* To Int

with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: error: ‘stoi’ was not declared in this scope Sign up Invalid conversion from 'char' to 'const Char*' in C++ up vote -1 down vote favorite I have declared a function (C++) int products(char num1, char num2, char num3, char num4, char num5); but my compiler is giving me this error: Invalid conversion from 'char' to 'const Char*' error initializing argument 1 of 'int atoi (const char*)' on line 22 when I attempt to pass num1, num2 etc. as a parameter to atoi. #include #include using namespace std; int Product(char num1, char num2, char num3, char num4, char num5); const string LargeNum = "7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450"; int main(){ int greatestVal = 0; for(int i = 0; i + 4 <= LargeNum.length(); i++ ){ if(greatestVal < Product(LargeNum[i], LargeNum[i+1], LargeNum[i+2], LargeNum[i+3], LargeNum[i+4])){ greatestVal = Product(LargeNum[i], LargeNum[i+

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Atoi Was Not Declared In This Scope

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Atoi C++

Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes http://stackoverflow.com/questions/13534532/invalid-conversion-from-char-to-const-char-in-c a minute: Sign up .cpp:23: error: cannot convert ‘std::string’ to ‘const char*’ for argument ‘1’ to ‘int atoi(const char*)’ up vote 1 down vote favorite Here a basic code I'm trying to run But I'm having trouble with stoi (it's c++) I keep getting error: ‘stoi’ was not declared in this scope I tried atoi and strtol with this error .cpp:23: http://stackoverflow.com/questions/30971933/cpp23-error-cannot-convert-stdstring-to-const-char-for-argument-1-t error: cannot convert ‘std::string’ to ‘const char*’ for argument ‘1’ to ‘int atoi(const char*)’ The code: using namespace std; int main(){ string numberGuessed; int intNumberGuessed = 0; do { cout << "Guess a numeber btw 1 - 10: " << endl; getline(cin, numberGuessed); intNumberGuessed = atoi(numberGuessed); cout << intNumberGuessed << endl; } while(intNumberGuessed != 4); cout<< "you win" << endl; return 0; } c++ string share|improve this question edited Jun 22 '15 at 5:12 Hi-Angel 1,30451440 asked Jun 22 '15 at 3:55 kirk mgurk 814 1 Use e.g. atoi(numberGuessed.c_str());. –Jonathan Potter Jun 22 '15 at 3:56 std::stoi requires you to #include , but it also requires a modern (C++11 compatible) compiler -- see en.cppreference.com/w/cpp/string/basic_string/stol. atoi requires a c-string which you can obtain with numberGuessed.c_str() –kfsone Jun 22 '15 at 4:33 Just use intNumberGuessed = atoi(numberGuessed.data()); and you are good to go. –Milan Patel Jun 22 '15 at 4:34 1 note: The original MinGW doesn't have stoi or to_string, however MinGW-w64 does –M.M Jun 22 '15 at 5:37 add a comment| 2 Answers 2 active oldest votes

and get tips & solutions from a https://bytes.com/topic/c/answers/954092-whats-wrong-program community of 418,434 IT Pros & Developers. It's quick & easy. what's wrong with this program? P: 6 Zee Malik I am getting the error: [Error] 'atoi' was not declared in this scope Expand|Select|Wrap|Line Numbers #include #include usingnamespacestd; intmain() { stringstr="131.90"; intn; n=atoi(str); cout< to your imports. That's where atoi is defined. Alternatively, if this is supposed to be C++, use the following imports: Expand|Select|Wrap|Line Numbers #include #include #include Share this Question 13 Replies 100+ P: 792 Luuk Did it return an char to int error?, or did it return unexpected results? Jan 12 '14 #2 reply P: 6 Zee Malik [Error] 'atoi' was not declared in this scope Jan 13 '14 #3 reply Expert 2.5K+ P: 3,112 Nepomuk Add Expand|Select|Wrap|Line Numbers #include to your imports. That's where atoi is defined. Alternatively, if this is supposed to be C++, use the following imports: Expand|Select|Wrap|Line Numbers #include #include #include Jan 13 '14 #4 reply P: 6 Zee Malik after added [Error] cannot convert 'std::string {aka std::basic_string}' to 'const char*' for argument '1' to 'int atoi(const char*)' Jan 13 '14 #5 reply Expert 2.5K+ P: 3,112 Nepomuk And rightfully so - string is a type which has a char array but isn't one itself. Try using the string::c_str() function: Expand|Select|Wrap|Line Numbers n=atoi(str.c_str()); Jan 13 '14 #6 reply P: 4 pundliknm Expand|Select|Wrap|Line Numbers #include #include #include usingnamespacestd; intmain() { charstr[100]="131.90"; intn; n=atoi(str); cout<

 

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