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Getting your C++ program to run

Here are some problems with compiling and running a quite straightforward C plus plus program (Gnu C++ compile gcc)

wizard:cpp graham$ g++ morethan.cpp
morethan.cpp:9:18: error: ir.inc: No such file or directory
morethan.cpp: In function  •[98]int main() •[99]:
morethan.cpp:27: error:  •[98]intread •[99] was not declared in this scope


What happened? An "include" file was missing ... it couldn't be found (first error), nor could symbols that were defined in it (second error)
Solution: Copy the include file into the current directory (have you only downloaded part of an application?)

wizard:cpp graham$ g++ morethan.cpp
Undefined symbols:
  "intread(char const*)", referenced from:
      _main in ccOOqa9r.o
      _main in ccOOqa9r.o
ld: symbol(s) not found
collect2: ld returned 1 exit status


What happened? The compile worked, but then you failed to link the compiler output to all the other components needed to make up an application.
Solution: Add the name of the other files that make up the application onto the compile / load command
OR Solution: Specify just compile (-c option) not compile and load (default)

wizard:cpp graham$ g++ morethan.cpp ir.cpp
wizard:cpp graham$


What happened? It worked ... "no news is good news" BUT where it the output file (the program)
Solution: It's in a file called a.out - that's the [very curious] default

wizard:cpp graham$ a.out
-bash: a.out: command not found


What happened? Your PATH doesn't include the current directory, so when you tried to run a.out it didn't look in the right place for it
Solution: Add current directory to PATH (but be aware of security issues)

wizard:cpp graham$ ./a.out
Enter year of first book 2006
Enter year of second book 2004
First book is newer
Age difference is 2
first book: 2006
second book: 2004


What happened? It worked!

wizard:cpp graham$ g++ -o moreisless morethan.cpp ir.cpp
wizard:cpp graham$


What happened? Compile, link / load and the output file is named this time

wizard:cpp graham$ ./moreisless
Enter year of first book 2010
Enter year of second book 2011
First book is older
Age difference is 1
first book: 2010
second book: 2011


What happened? It worked!

The source code used in this example can be found in our Introduction to C++ resource bundle
(written 2010-11-15, updated 2010-11-16)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
C051 - C and C based languages - C++ - General
  [4355] C++ in 2 days - (2014-12-18)
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  [3809] Dwarf Exception Unwind Info - (2012-07-20)
  [3587] C++ Courses - do I get official certification at the end of my Well House course? - (2012-01-20)
  [3250] C++ - how we teach the language and the concepts behind the language - (2011-04-17)
  [3155] Rake - a build system using code written in Ruby - (2011-02-03)
  [3129] Extra courses - C and C++ - (2011-01-12)
  [3067] Using C and C++ functions in the same program - how to do it - (2010-11-24)
  [2851] Further C++ material - view new or old - (2010-07-04)
  [2763] Our C and C++ training course are on Open Source platforms - (2010-05-13)
  [2577] Complete teaching example - C++, inheritance, polymorphism - (2010-01-15)
  [2536] All the Cs ... and Java too - (2009-12-13)
  [2504] Learning to program in ... - (2009-11-15)
  [2370] C++, Python, and other training - do we use an IDE - (2009-08-21)

C231 - C and C based languages - Introduction to C++
  [4562] Left shift operator on an output stream object - C++ - (2015-10-30)
  [4561] Hello World in C++ - a first program, with the process explained - (2015-10-30)
  [4466] Moving from C to C++ - Structured to Object Oriented - a lesson for engineers - (2015-03-28)
  [3069] Strings, Garbage Collection and Variable Scope in C++ - (2010-11-25)
  [3053] Make - automating the commands for building and installing - (2010-11-16)
  [2845] Objects and Inheritance in C++ - an easy start - (2010-07-01)
  [2169] When should I use OO techniques? - (2009-05-11)
  [2004] Variable Scope in C++ - (2009-01-22)
  [928] C++ and Perl - why did they do it THAT way? - (2006-11-16)
  [336] Targetted Advertising - (2005-06-05)
  [318] Choosing a theme - (2005-05-20)
  [317] Programming languages - a comparison - (2005-05-20)


Back to
Positively reforming the system - could it be done?
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or
Horse's mouth home
Forward to
Make - automating the commands for building and installing
Some other Articles
C++ - a complete example with polymorphism, and how to split it into project files
Zyliana Kyrei Cox
Longhope Hotel
Getting your C++ program to run
Positively reforming the system - could it be done?
Views of Melksham - November 2010
Computer Graphics is fun - even if Java Applets are Old Hat
String handling - from first steps to practical examples
What is a universal superclass? Java / Perl / Python / Other OO languages
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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