Difference between “while” loop and “do while” loop

The do while loop executes the content of the loop once before checking the condition of the while.

Whereas a while loop will check the condition first before executing the content.

In this case you are waiting for user input with scanf(), which will never execute in the while loop as wdlen is not initialized and may just contain a garbage value which may be greater than 2.

Related Posts:

  1. What is Innermost loop in imperfectly nested loops?
  2. The difference between n++ and ++n at the end of a while loop? (ANSI C)
  3. Implementing Taylor Series for sine and cosine in C
  4. Working on code to calculate cosine with factorial sum
  5. warning: implicit declaration of function
  6. pthread_join() and pthread_exit()
  7. Why should we typedef a struct so often in C?
  8. What exactly is the difference between “pass by reference” in C and in C++?
  9. What does “collect2: error: ld returned 1 exit status” mean?
  10. Floating point exception (core dumped)
  11. Undefined reference to pthread_create in Linux
  12. Correct format specifier for double in printf
  13. dereferencing pointer to incomplete type
  14. How to convert a string to integer in C?
  15. Get a substring of a char* [duplicate]
  16. What is the behavior of integer division?
  17. Expression must be a modifiable L-value
  18. Awesomium sdk download
  19. Bad File Descriptor with Linux Socket write() Bad File Descriptor C
  20. How do I use valgrind to find memory leaks?
  21. What is the difference between char s[] and char *s?
  22. Error “initializer element is not constant” when trying to initialize variable with const
  23. munmap_chunk(): invalid pointer
  24. What is the LD_PRELOAD trick?
  25. What is the argument for printf that formats a long?
  26. Cannot assign requested address – possible causes?
  27. Using %s in C correctly – very basic level
  28. How do you make an array of structs in C?
  29. need help understanding the movzbl call in this function
  30. What is the difference between read and pread in unix?
  31. What does “control reaches end of non-void function” mean?
  32. How to create my own header file in c++?
  33. connect Error: “No route to host”
  34. Undefined reference to pow( ) in C, despite including math.h [duplicate]
  35. warning: implicit declaration of function
  36. C dynamically growing array
  37. Returning string from C function
  38. Why do I get an assertion failure?
  39. Difference between int32, int, int32_t, int8 and int8_t
  40. Char Comparison in C
  41. C language: float % float why expression must have integral type
  42. what is the unsigned datatype?
  43. Reading \r (carriage return) vs \n (newline) from console with getc?
  44. lvalue required as left operand of assignment
  45. how to convert negative hexadecimal to decimal
  46. Invalid pointer error on invoking free() after malloc in C
  47. Why am I getting “undefined reference to sqrt” error even though I inclu de math.h header?
  48. Reading a string with scanf
  49. How to initialize a struct in accordance with C programming language standards
  50. Expression preceding parentheses?
  51. Linux equivalent of I_PUSH
  52. Understanding INADDR_ANY for socket programming
  53. getopt_long() — proper way to use it?
  54. C read file line by line
  55. The Definitive C Book Guide and List[
  56. When is it a good idea to use strdup (vs malloc / strcpy)
  57. C read file line by line
  58. Copying a part of a string (substring) in C
  59. expression must have integral type
  60. Incompatible implicit declaration of built-in function ‘malloc’
  61. Why is %c used in C?
  62. Need more information about Aborted (core dumped)
  63. What’s wrong with my code? What is argv[1]?
  64. What can cause a “Resource temporarily unavailable” on sock send() command
  65. When and why to use malloc?
  66. How to solve error: expected identifier or ‘(‘
  67. C compile error: Id returned 1 exit status
  68. How do I concatenate const/literal strings in C?
  69. Reversing a string in C
  70. Efficient way to find task_struct by pid
  71. When a number is written as 0x00… what does the x mean
  72. How to remove the character at a given index from a string in C?
  73. Why am I getting this memory access error ‘double free or corruption’?
  74. waitpid, wnohang, wuntraced. How do I use these
  75. Split string with delimiters in C
  76. How to pause in C?
  77. (.text+0x20): undefined reference to `main’ and undefined reference to function
  78. Why am I getting this error: “data definition has no type or storage class”?
  79. I’m getting “Invalid Initializer”, what am I doing wrong?
  80. Writing binary number system in C code
  81. Error: initializer element is not computable at load time
  82. “No such file or directory” error in CodeBlocks
  83. Convert char array to string use C
  84. warning: passing argument ’from incompatible pointer type [enabled by default]’
  85. Return a `struct` from a function in C
  86. Scanning Multiple inputs from one line using scanf
  87. Which of sprintf/snprintf is more secure?
  88. Allocating char array using malloc
  89. Implementation of strtok() function
  90. switch case: error: case label does not reduce to an integer constant
  91. warning: incompatible implicit declaration of built-in function ‘printf’ [enabled by default]
  92. warning: return makes pointer from integer without a cast but returns integer as desired
  93. The difference between char * and char[] [duplicate]
  94. How to clear input buffer in C?
  95. What primitive data type is time_t? [duplicate]
  96. Usage of \b and \r in C
  97. Swapping 2 Bytes of Integer
  98. GDB no such file or directory
  99. Parsing command-line arguments in C
  100. lvalue required as increment operand

Leave a Comment