 |
what do u mean by return 0 and return 1 at the end of main program in C ??????
| This defines the exit status of the process. Despite being an int, on Unix-like systems, the value is always in the range 0-255 (see Exit and Exit Status). On Microsoft systems you may use 32-bit signed integers as exit codes, which you can check with %ERRORLEVEL%. For portability, I'd recommend sticking to the 0-255 range. example: $ cat -n exit_code.cpp 1 int main() 2 { 3 return 42; 4 } 5 Build: $ make exit_code g++ exit_code.cpp -o exit_code Run (in bash): $ ./exit_code Check the exit status: $ echo $? 42 Conventionally, a status of zero signifies success and non-zero failure. This can be useful in shell scripts, and so forth to indicate the level of failure, if any: $ ./exit_code exit_status=$? if [[ ${exit_status} ]] ; then echo "The process failed with status ${exit_status}." else echo "Success!" fi The process failed with status 42. Following the comments below... In the standard C++ header <cstdlib>, the following macros are defined: #define EXIT_SUCCESS 0 #define EXIT_FAILURE 1 However, the Exit Status section of the GNU C Library documentation, describing the same macros, sagely states: Portability note: Some non-POSIX systems use different conventions for exit status values. For greater portability, you can use the macros EXIT_SUCCESS and EXIT_FAILURE for the conventional status value for success and failure, respectively. They are declared in the file stdlib.h. |  1 |
By: [email protected] On: Thu Apr 04 00:27:11 IST 2013  0  147  0 | 147 |
| Are You Satisfied :1Yes1No |
| The main function in c returns value to the OS. | 0 |
| By: [email protected] On: Thu Apr 04 12:53:37 IST 2013 0 77 0 | 77 |
| Are You Satisfied :3Yes1No |
Like/Subscribe us for latest updates or newsletter 
