Three simple steps
How to use this tool?
This free online converter translates C source code into Fortran in three simple steps.
- Step 1
Add your C code
Type, paste, or upload the C code you want to translate.
- Step 2
Convert the code
Click Convert to translate the source code into Fortran.
- Step 3
Review the result
Review, copy, or download the resulting Fortran code from the output editor.
See it in action
Examples of C to Fortran conversion
These examples show C source code and the corresponding Fortran translation. Generated results can vary as AI models are updated.
Example 1
Is String Palindrome
Program that checks if a string is a palindrome or not.
C code
Fortran code
Example 2
Even or Odd
A well commented function to check if a number if odd or even.
C code
Fortran code
Language comparison
Key differences between C and Fortran
| Characteristic | C | Fortran |
|---|---|---|
| Syntax | C has a syntax that is similar to other programming languages like Java and C++. It uses curly braces to define blocks of code and semicolons to end statements. | Fortran has a syntax that is more similar to mathematical notation. It uses keywords like 'DO' and 'END DO' to define loops and has a more verbose syntax for array operations. |
| Paradigm | C is a procedural programming language, which means that it focuses on defining procedures or functions that perform specific tasks. | Fortran is a procedural programming language, but it also has support for object-oriented programming through the Fortran 2003 standard. |
| Typing | C is a statically typed language, which means that variable types are defined at compile time and cannot be changed during runtime. | Fortran is a statically typed language, but it also has support for dynamic memory allocation through the 'ALLOCATABLE' keyword. |
| Performance | C is known for its high performance and is often used for systems programming and embedded systems. | Fortran is also known for its high performance, especially in scientific computing and numerical analysis. |
| Libraries and frameworks | C has a large number of libraries and frameworks available, including the standard C library and popular frameworks like GTK+ and Qt. | Fortran has a smaller number of libraries and frameworks available, but it does have support for the BLAS and LAPACK libraries for numerical analysis. |
| Community and support | C has a large and active community, with many resources available for learning and support. | Fortran also has a dedicated community, especially in the scientific computing and numerical analysis fields. |
| Learning curve | C has a steep learning curve, especially for beginners who are not familiar with low-level programming concepts. | Fortran also has a steep learning curve, especially for beginners who are not familiar with scientific computing and numerical analysis concepts. |
Common questions
Frequently Asked Questions
How do I convert C to Fortran?
Paste your C code into the input box, confirm the languages are set to C and Fortran, and click Convert. CodeConvert AI analyzes your C code and generates equivalent Fortran code in seconds, preserving the original logic and structure.
What are the main differences between C and Fortran?
C and Fortran differ in syntax, type system, standard libraries, and common idioms, so copying code line for line usually will not compile. The converter maps each C construct to its closest Fortran equivalent. See the comparison table below for the key differences between C and Fortran.
Is the converted Fortran code accurate?
The AI produces high-quality Fortran code that preserves the behavior of your original C code and follows Fortran conventions. It handles common patterns, data structures, and idioms for both C and Fortran. For large or performance-critical code, review and test the Fortran output before using it in production.
Can I convert an entire C project to Fortran?
You can convert C files one at a time by pasting each file's code. For a full migration, convert each file and then review how classes, dependencies, and project structure map from C to Fortran. Signing in for free raises the input limit to 25,000 characters per conversion for larger files.
Can I convert Fortran back to C?
Yes. CodeConvert AI converts in both directions, so you can convert Fortran to C just as easily using our Fortran to C converter. Try the Fortran to C Converter
Is the C to Fortran converter free, and do I need to install anything?
Yes, it is free and runs in your browser with nothing to install and no IDE extension required. You can convert C to Fortran without an account for up to 2 conversions per day. Sign in for free for higher limits.
What are the benefits of signing in?
Signing in unlocks CodeConvert AI's Pro converter with more powerful AI models, a built-in chat assistant, code execution, saved conversion history, and personal notes. Every free account includes 5 credits and supports up to 25,000 characters of input per conversion, with no credit card required.
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