There are multiple C++ compilers available on the net which can be used online. The advantage is that you can check your prototypes and share them easily.
| Compiler | Standard | Syntax highlighting | Show program stdout | Interactive input | View Assembler output | |
|---|---|---|---|---|---|---|
| http://cpp.sh/ | gcc 4.9.2, Boost 1.55 available | C++98 C++11 C++14 | yes | yes | possible | no |
| http://coliru.stacked-crooked.com/ | gcc 4.6 gcc 4.7 gcc 4.8 gcc 4.9 gcc 5.1 clang-3.6 | C++98 C++11 C++14 C++17 | yes | yes | no | no |
| https://gcc.godbolt.org/ | ARM gcc 4.5.3 ARM gcc 4.6.3 ARM gcc 4.8.2 ARM64 gcc 4.8 AVR gcc 4.5.3 PowerPC gcc 4.8 x86 clang 3.0 x86 clang 3.2 x86 clang 3.3 x86 clang 3.4.1 x86 clang 3.5.0 x86 clang 3.5.1 x86 clang 3.6 (rc2) x86 clang 3.7 (experimental) x86 gcc 4.4.7 x86 gcc 4.5.3 x86 gcc 4.6.4 x86 gcc 4.7.3 x86 gcc 4.8.1 x86 gcc 4.8.2 x86 gcc 4.9.0 x86 gcc 4.9.0 (w/concepts) x86 gcc 4.9.0 (w/concepts) x86 gcc 4.9.2 x86 gcc 5.1.0 x86 icc 13.0.1 | yes | no | no | yes | |
| http://webcompiler.cloudapp.net/ | Microsoft Visual Studio 2015 19.00.23008.0(x86) | |||||
| http://ideone.com/ | gcc 4.9.2 gcc 4.9.2 (C++14) | |||||
| http://melpon.org/wandbox |
Remarks
Example command lines for the Coliru online compiler
g++-4.6 -std=c++98 -O2 -Wall -Wextra -pedantic -pthread -pedantic-errors main.cpp -lm && ./a.out g++-4.7 -std=c++98 -O2 -Wall -Wextra -pedantic -pthread -pedantic-errors main.cpp -lm && ./a.out g++-4.7 -std=c++11 -O2 -Wall -Wextra -pedantic -pthread -pedantic-errors main.cpp -lm && ./a.out g++-4.8 -std=c++98 -O2 -Wall -Wextra -pedantic -pthread -pedantic-errors main.cpp -lm && ./a.out g++-4.8 -std=c++11 -O2 -Wall -Wextra -pedantic -pthread -pedantic-errors main.cpp -lm && ./a.out g++-4.9 -std=c++98 -O2 -Wall -Wextra -pedantic -pthread -pedantic-errors main.cpp -lm && ./a.out g++-4.9 -std=c++11 -O2 -Wall -Wextra -pedantic -pthread -pedantic-errors main.cpp -lm && ./a.out g++-4.9 -std=c++14 -O2 -Wall -Wextra -pedantic -pthread -pedantic-errors main.cpp -lm && ./a.out g++-5.1 -std=c++98 -O2 -Wall -Wextra -pedantic -pthread -pedantic-errors main.cpp -lm && ./a.out g++-5.1 -std=c++11 -O2 -Wall -Wextra -pedantic -pthread -pedantic-errors main.cpp -lm && ./a.out g++-5.1 -std=c++14 -O2 -Wall -Wextra -pedantic -pthread -pedantic-errors main.cpp -lm && ./a.out g++-5.1 -std=c++1z -O2 -Wall -Wextra -pedantic -pthread -pedantic-errors main.cpp -lm && ./a.out clang++ -std=c++98 -O2 -Wall -Wextra -pedantic -pthread -pedantic-errors main.cpp -lm && ./a.out clang++ -std=c++11 -stdlib=libc++ -O2 -Wall -Wextra -pedantic -pthread -pedantic-errors main.cpp -lm -lsupc++ && ./a.out clang++ -std=c++14 -stdlib=libc++ -O2 -Wall -Wextra -pedantic -pthread -pedantic-errors main.cpp -lm -lsupc++ && ./a.out clang++ -std=c++1z -stdlib=libc++ -O2 -Wall -Wextra -pedantic -pthread -pedantic-errors main.cpp -lm -lsupc++ && ./a.out
Other languages
http://ideone.com/ supports a lot of other languages, too.