Fatal error iostream No such file or directory in compiling C program using GCC

Question

Why when I wan to compile the following multi thread merge sorting C program  I receive this error    ap sharifvm   forTHE04a  gcc -g -Wall -o mer mer c -lpthread mer c 4 20  fatal error  iostream  No such file or directory   include  lt iostream gt                        compilation terminated  ap sharifvm   forTHE04a  gcc -g -Wall -o mer mer c -lpthread mer c 4 22  fatal error  iostream h  No such file or directory   include  lt iostream h gt                          compilation terminated    My program    include  lt stdio h gt   include  lt stdlib h gt   include  lt pthread h gt   include  lt iostream gt  using namespace std    define N 2       of thread     int a      10  9  8  7  6  5  4  3  2  1       target array        structure for array index    used to keep low high end of sub arrays     typedef struct Arr       int low      int high    ArrayIndex   void merge int low  int high            int mid    low high  2          int left   low          int right   mid 1           int b high-low 1           int i  cur   0           while left  lt   mid  amp  amp  right  lt   high                    if  a left   gt  a right                           b cur      a right                     else                         b cur      a right                        while left  lt   mid  b cur      a left             while right  lt   high  b cur      a left             for  i   0  i  lt   high-low 1    i    a low i    b i      void   mergesort void  a            ArrayIndex  pa    ArrayIndex   a          int mid    pa- gt low   pa- gt high  2           ArrayIndex aIndex N           pthread t thread N            aIndex 0  low   pa- gt low          aIndex 0  high   mid           aIndex 1  low   mid 1          aIndex 1  high   pa- gt high           if  pa- gt low  gt   pa- gt high  return 0           int i          for i   0  i  lt  N  i    pthread create  amp thread i   NULL  mergesort   amp aIndex i            for i   0  i  lt  N  i    pthread join thread i   NULL            merge pa- gt low  pa- gt high              pthread exit NULL           return 0     int main             ArrayIndex ai          ai low   0          ai high   sizeof a  sizeof a 0  -1          pthread t thread           pthread create  amp thread  NULL  mergesort   amp ai           pthread join thread  NULL            int i          for  i   0  i  lt  10  i    printf    d    a i            cout  lt  lt  endl           return 0

User · Answer

Seems like you posted a new question after you realized that you were dealing with a simpler problem related to size_t. I am glad that you did.

Anyways, You have a .c source file, and most of the code looks as per C standards, except that #include <iostream> and using namespace std;

C equivalent for the built-in functions of C++ standard #include<iostream> can be availed through #include<stdio.h>

Replace #include <iostream> with #include <stdio.h>, delete using namespace std;
With #include <iostream> taken off, you would need a C standard alternative for cout << endl;, which can be done by printf("\n"); or putchar('\n');
Out of the two options, printf("\n"); works the faster as I observed.

When used printf("\n"); in the code above in place of cout<<endl;
```
$ time ./thread.exe
1 2 3 4 5 6 7 8 9 10

real    0m0.031s
user    0m0.030s
sys     0m0.030s
```
When used putchar('\n'); in the code above in place of cout<<endl;
```
$ time ./thread.exe
1 2 3 4 5 6 7 8 9 10

real    0m0.047s
user    0m0.030s
sys     0m0.030s
```

Compiled with Cygwin gcc (GCC) 4.8.3 version. results averaged over 10 samples. (Took me 15 mins)

User · Answer

Neither  lt iostream gt  nor  lt iostream h gt  are standard C header files  Your code is meant to be C    where  lt iostream gt  is a valid header  Use g    and a  cpp file extension  for C   code   Alternatively  this program uses mostly constructs that are available in C anyway  It s easy enough to convert the entire program to compile using a C compiler  Simply remove  include  lt iostream gt  and using namespace std   and replace cout  lt  lt  endl  with putchar   n       I advise compiling using C99  eg  gcc -std c99

[c++] Fatal error: iostream: No such file or directory in compiling C program using GCC

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