Ошибка cpp|7|error: 'itoa' was not declared in this scope

Вот: source_file.cpp: In function 'int main()': source_file.cpp:10:12: error: 'strlen' was not declared in this scope
#include<iostream> using namespace std; int main() { char a,b; int i,j; cout<<"Напишите слово:"; cin>>a; i=0; ...

C:\tsserver\Projects\cpp\codeblocks\MyComp\IDE\IDE\IDE.cpp|1 5|error: 'InitApplication' was not declared in this scope|
//================================================================================================= #include "IDE.hpp"...

Main.cpp: In function ‘int main()’: main.cpp:10:1: error: ‘then’ was not declared in this scope
Написал программу и выдает ошибку. #include <iostream> #include <math.h> using namespace std; int main() {double a, b, x; ...

Ошибка: [Error] 'x' was not declared in this scope
Не могу понять в чём ошибка. Компилятор пишет что в строке cin>>x.name>>x.surname>>x.number; . Ошибка: 'x' was not declared in this scope....

Ошибка [Error] 'ofstream' was not declared in this scope
Дали задание мини БД с записью в файл Но вот ошибка 'ofstream' was not declared in this scope компилирую в dev-cpp5.8.2 ...

Test.cpp:19: error: ‘mysql’ was not declared in this scope
пытаюсь скомпилировать такой код: #include <iostream> #include <mysql/mysql.h> using namespace std; void exiterr(int exitcode); ...

Ошибка: error: 'error' was not declared in this scope
#include <iostream> #include<vector> using namespace std; int area(int a,int b) { if(a<=0 || b<=0) error("area()...

Ошибка при компиляции error: 'endl' was not declared in this scope
#include <stdio.h> #include <conio.h> void main() { double a, b, x, h, r, s; int n, zn = -1, k; puts("Input...