By naming your sourcefile with the.c extension you force the compiler to perform C compilation and Dev-C ti use C compilation settings. Dev-C's C compilation settings do not include the C backward compatibility directory (for obvious reasons), and, and even if it did the iostream.h header file would not compile as C code. Hi, I am using Dev-C to teach C at my university. The first examples I discuss in class are very very simple (like hello word). Anyway I would like to show the output. Unfortunately, Dev-C close immediately the output window. I did not find any options to change this behaviour.
| Language | ||||
| Standard Library Headers | ||||
| Freestanding and hosted implementations | ||||
| Named requirements | ||||
| Language support library | ||||
| Concepts library(C++20) | ||||
| Diagnostics library | ||||
| Utilities library | ||||
| Strings library | ||||
| Containers library | ||||
| Iterators library | ||||
| Ranges library(C++20) | ||||
| Algorithms library | ||||
| Numerics library | ||||
| Input/output library | ||||
| Localizations library | ||||
| Regular expressions library(C++11) | ||||
| Atomic operations library(C++11) | ||||
| Thread support library(C++11) | ||||
| Filesystem library(C++17) | ||||
| Technical Specifications |
| I/O manipulators | ||||
| C-style I/O | ||||
| Buffers | ||||
(deprecated in C++98) | ||||
(C++20) | ||||
| Streams | ||||
| Abstractions | ||||
| File I/O | ||||
| String I/O | ||||
| Array I/O | ||||
(deprecated in C++98) | ||||
(deprecated in C++98) | ||||
(deprecated in C++98) | ||||
| Synchronized Output | ||||
(C++20) | ||||
| Types | ||||
| Error category interface | ||||
(C++11) | ||||
(C++11) |
How To Use Iomanip In C++
| Floating-point formatting | ||||||||||||||||
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| Integer formatting | ||||||||||||||||
| Boolean formatting | ||||||||||||||||
| Field width and fill control | ||||||||||||||||
| Other formatting | ||||||||||||||||
| Whitespace processing | ||||||||||||||||
| Output flushing | ||||||||||||||||
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| Status flags manipulation | ||||||||||||||||
| Time and money I/O | ||||||||||||||||
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| Quoted manipulator | ||||||||||||||||
(C++14) | ||||||||||||||||
/*unspecified*/ setprecision(int n ); |
When used in an expression out << setprecision(n) or in >> setprecision(n), sets the precision parameter of the stream out or in to exactly n.
[edit]Parameters
| n | - | new value for precision |
[edit]Return value
Returns an object of unspecified type such that if str is the name of an output stream of type std::basic_ostream<CharT, Traits> or an input stream of type std::basic_istream<CharT, Traits>, then the expression str << setprecision(n) or str >> setprecision(n) behaves as if the following code was executed:
str.precision(n);
[edit]Example
Output:
[edit]See also
Why We Use Iomanip In C++
(C++11)(C++11) | changes formatting used for floating-point I/O (function)[edit] |
| manages decimal precision of floating point operations (public member function of std::ios_base)[edit] |