So what does “return 0” actually mean?

Is it like php, where it returns its argument as the value of the function call? Is it just good practise?

Yes, PHP and many other languages borrowed the return keyword from ‘C’. And in all the languages, the return keyword has the same function – to return from the function. Anything that follows return keyword is the value that is returned to the caller.

Is it a good practise? Yes and No. Not all functions should return a value. And quite a few in the standard library even, do not return any value. Hence their return type is void.

But main function should return 0(also EXIT_SUCCESS) to identify that the program has executed successfully. And -1 otherwise (also EXIT_FAILURE)

EDIT: (Thanks to @KeithThompson):

EXIT_FAILURE is implementation defined. 1 is a common value of EXIT_FAILURE but the whole point is, you need not know.

Related Posts:

  1. The difference between n++ and ++n at the end of a while loop? (ANSI C)
  2. Working on code to calculate cosine with factorial sum
  3. warning: implicit declaration of function
  4. Two questions about basic C programs
  5. What exactly is the difference between “pass by reference” in C and in C++?
  6. What does “collect2: error: ld returned 1 exit status” mean?
  7. How to convert an int to string in C?
  8. Floating point exception (core dumped)
  9. what is the difference between uint16_t and unsigned short int incase of 64 bit processor?
  10. Correct format specifier for double in printf
  11. How to convert a string to integer in C?
  12. What is the behavior of integer division?
  13. Awesomium sdk download
  14. What is EOF in the C programming language?
  15. Write to .txt file?
  16. Reading from file using read() function
  17. What is the difference between ++i and i++?
  18. warning: assignment makes integer from pointer without a cast
  19. munmap_chunk(): invalid pointer
  20. printf() formatting for hexadecimal
  21. The importance of c enumeration (typedef enum) [duplicate]
  22. What does #pragma once mean in C? [duplicate]
  23. Connect: Socket operation on non-socket
  24. “Initializer element is not constant” in C
  25. How do you do exponentiation in C?
  26. Printing long int value in C
  27. Undefined reference to pow( ) in C, despite including math.h [duplicate]
  28. Undefined reference to pow( ) in C, despite including math.h [duplicate]
  29. C programming, error: called object is not a function or function pointer
  30. How to convert an int to string in C?
  31. Process finished with exit code 11 | Error during malloc [duplicate]
  32. How does wait(NULL) exactly work?
  33. How to replicate vector in c?
  34. Try catch statements in C
  35. How do I create an array of strings in C?
  36. How to check if a string is a number?
  37. C compile error: “Variable-sized object may not be initialized”
  38. What does WEXITSTATUS(status) return?
  39. Difference between a Structure and a Union
  40. Xcode – Warning: Implicit declaration of function is invalid in C99
  41. Error: control may reach end of non-void function in C
  42. The difference between stdout and STDOUT_FILENO
  43. C language: float % float why expression must have integral type
  44. Reading \r (carriage return) vs \n (newline) from console with getc?
  45. Invalid pointer error on invoking free() after malloc in C
  46. In C, how should I read a text file and print all strings
  47. What does “Size in TCHARs” means?
  48. Python ? (conditional/ternary) operator for assignments
  49. What’s the difference between a file descriptor and file pointer?
  50. return makes integer from pointer without a cast [-Wint-conversion] return candidate
  51. Math constant PI value in C
  52. Cygwin – Makefile-error: recipe for target `main.o’ failed
  53. Why am I getting “undefined reference to sqrt” error even though I include math.h header?
  54. Why am I getting “undefined reference to sqrt” error even though I include math.h header?
  55. How can I use an array of function pointers?
  56. Expected declaration specifier error in function
  57. Valgrind: Invalid read of size 1
  58. When and why to use malloc?
  59. Multiple definition of … linker error
  60. Does sizeof return the number of bytes or the number of octets of a type in C?
  61. C compile error: Id returned 1 exit status
  62. How do I concatenate const/literal strings in C?
  63. Efficient way to find task_struct by pid
  64. Why am I getting this memory access error ‘double free or corruption’?
  65. Passing an array by reference in C?
  66. size of struct in C
  67. Warning: return from incompatible pointer type in C
  68. How to generate a random number between 0 and 1?
  69. How can one print a size_t variable portably using the printf family?
  70. How to make sense of modulo in c
  71. Memory Clobbering Error
  72. “No such file or directory” error in CodeBlocks
  73. Check if input is integer type in C
  74. Iterate through a C array
  75. Uninitialized value was created by a heap allocation
  76. Makefile:1: *** missing separator. Stop
  77. double free or corruption (!prev) error in c program
  78. xorl %eax – Instruction set architecture in IA-32
  79. What does this GCC error “… relocation truncated to fit…” mean?
  80. Using floats with sprintf() in embedded C
  81. Printf width specifier to maintain precision of floating-point value
  82. Two or more data types in declaration specifiers error
  83. ‘sprintf’: double precision in C
  84. C printing bits
  85. How do I find the time complexity (Big O) of while loop?
  86. Why do we use NULL in strtok()?
  87. PTHREAD_MUTEX_INITIALIZER vs pthread_mutex_init ( &mutex, param)
  88. How to concatenate string and int in C?
  89. execvp: bad address error
  90. How detect malloc failure?
  91. A Simple, 2d cross-platform graphics library for c or c++?
  92. Removing last character in C
  93. error: ISO C forbids nested functions – What’s wrong?
  94. Dereference void pointer
  95. Use of flag in c?
  96. Carriage return in C?
  97. fgetc(stdin) in a loop is producing strange behaviour
  98. Difference between “while” loop and “do while” loop
  99. Swapping 2 Bytes of Integer
  100. GDB no such file or directory

Leave a Comment

techhipbettruvabetnorabahisbahis forumutaraftarium24eduedusedusedusedusedueduedueduedu