System not declared in scope

Question

I know its simple code  How do I fix  System not declared in scope  problem    include lt iostream gt  using namespace std   int main void        system    TITLE Calculator         system    COLOR 2         char cChar      double dfirstnumber      double dsecondnumber      char cDoagain       do               system  CLS            cout  lt  lt   Please enter the first number you would like to use   lt  lt  endl          cin  gt  gt  dfirstnumber          cout lt  lt   Please enter the operation you would like to perform    lt  lt       -   or      lt  lt  endl          cin  gt  gt  cChar          cout lt  lt   Please enter the second number you would like to use    lt  lt  endl          cin  gt  gt  dsecondnumber           switch  cChar                        case                      cout  lt  lt   The answer is     lt  lt  dfirstnumber  lt  lt       lt  lt  dsecondnumber  lt  lt       lt  lt                   dfirstnumber   dsecondnumber   lt  lt  endl                  break              case  -                   cout  lt  lt   The answer is     lt  lt  dfirstnumber  lt  lt   -   lt  lt  dsecondnumber  lt  lt       lt  lt                   dfirstnumber - dsecondnumber   lt  lt  endl                  break              case                      cout  lt  lt   The answer is     lt  lt  dfirstnumber  lt  lt       lt  lt  dsecondnumber  lt  lt       lt  lt                   dfirstnumber   dsecondnumber   lt  lt  endl                  break              case  x                   cout  lt  lt   The answer is     lt  lt  dfirstnumber  lt  lt   x   lt  lt  dsecondnumber  lt  lt       lt  lt                   dfirstnumber   dsecondnumber   lt  lt  endl                  break              case  X                   cout  lt  lt   The answer is     lt  lt  dfirstnumber  lt  lt   X   lt  lt  dsecondnumber  lt  lt       lt  lt                   dfirstnumber   dsecondnumber   lt  lt  endl                  break              case                      if dsecondnumber    0                   cout lt  lt   That is an invalid operation    lt  lt  endl                   else                  cout  lt  lt   The answer is     lt  lt  dfirstnumber  lt  lt       lt  lt  dsecondnumber  lt  lt       lt  lt                   dfirstnumber   dsecondnumber   lt  lt  endl                             break                  default                      cout  lt  lt   That is an invalid operation    lt  lt  endl                      break                        cout  lt  lt   Would you like to start again   Y N    lt  lt  endl                  cin  gt  gt   cDoagain       while  cDoagain     Y  or cDoagain     y        system  PAUSE        return 0      Heres my end message      C  Documents and Settings Nilo My Documents Work Testing main cpp  In   function  int main      C  Documents and Settings Nilo My   Documents Work Testing main cpp 8 error   system  was not declared in   this scope             Build finished  1 errors  0 warnings

User · Answer

You need to add     include  lt cstdlib gt    in order for the compiler to see the prototype for system

User · Answer

Chances are that you ve not included the header file that declares system     In order to be able to compile C   code that uses functions which you don t  manually  declare yourself  you have to pull in the declarations  These declarations are normally stored in so-called header files that you pull into the current translation unit using the  include preprocessor directive  As the code does not  include the header file in which system   is declared  the compilation fails   To fix this issue  find out which header file provides you with the declaration of system   and include that  As mentioned in several other answers  you most likely want to add  include  lt cstdlib gt

[c++] System not declared in scope?

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