Constants in Cilk

Our first program will declare and use constants. Here’s the full source code.

#include <cstdio>
#include <cmath>

const char* s = "constant";

int main() {
    printf("%s\n", s);

    // A `const` statement can appear anywhere a `var` statement can.
    const int n = 500000000;

    // Constant expressions perform arithmetic with arbitrary precision.
    const double d = 3e20 / n;
    printf("%e\n", d);

    // A numeric constant has no type until it’s given one, such as by an explicit conversion.
    printf("%lld\n", static_cast<long long>(d));

    // A number can be given a type by using it in a context that requires one, such as a variable assignment or function call.
    // For example, here `sin` expects a `double`.
    printf("%f\n", sin(n));
    
    return 0;
}

To run the program, save the code in a file named constant.cpp, and use a C++ compiler to build and execute it.

$ g++ -o constant constant.cpp
$ ./constant
constant
6.000000e+11
600000000000
-0.284705

Now that we can run and build basic C++ programs, let’s learn more about the language.

Variables in Cilk

For in Cilk

Learn X By Example

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Constants in Cilk