Fatal Error: iOStream.H No Such File or Directory

fatal error: iostream.h no such file or directory

That header doesn't exist in standard C++. It was part of some pre-1990s compilers, but it is certainly not part of C++.

Use #include <iostream> instead. And all the library classes are in the std:: namespace, for ex­am­ple std::cout.

Also, throw away any book or notes that mention the thing you said.

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

Neither <iostream> nor <iostream.h> are standard C header files. Your code is meant to be C++, where <iostream> is a valid header. Use a C++ compiler such as clang++ or 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 <iostream> and using namespace std;, and replace cout << endl; with putchar('\n');... I advise compiling using C99, C11 or C18 (eg. gcc -std=c99, clang -std=c18 etc)

iostream.h: no such file or directory

In addition to changing to

#include <iostream> 

You can also add

using namespace std;

before main if you want to use cout without having to use std::cout.

fatal error: iostream.h: No such file or directory

You want to include iostream. iostream.h was present in Stroustrup's C++:

The original iostream library was written to challenge the claim that
a terse, type safe I/O system needed special language support. 1 It
was developed at Bell Labs by Bjarne Stroustrup and shipped with the
original C++ compiler, CFront and described in the first edition of
Stroustrup's The C++ Programming Language. This version of the
iostream library lived in the headers iostream.h, fstream.h and so on.

The Standard C++ has the headers without the .h, so you want to:

#include <iostream>

Here is an article that discusses this.

Fatal error: iostream: No such file or directory #include iostream

You seem to have not installed C++ support in MinGW. If you are using the manual installation route, download the gcc-c++ dev, dll, and bin files. If you are using the automated GUI installer (recommended for newcomer to C++), make sure to check the C++ package:

Cygwin showing error iostream.h is unable to locate

change to

#include <iostream>
#include <cstdio>
int main(){
    printf("Hai");
}

or with g++ -x c hai.c or gcc hai.c

#include <stdio.h>
int main(){
    printf("Hai");
}

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