Computation Script Language (CSL) is a language for computation scripts and simple arithmetics. It supports:

• Arithmetic calculation (+, -, *, /, %, ^[power]);
• Boolean calculation (and, or, not) same as Python;
• Controls (if, else, for, while) same as C;
• Variables and declarations;
• Types (int, float, char, string);
• Functions (Pre-defined functions and self-definition);
• Modules (Include other files by 'import')

Similar to Python, a CSL program can run directly by line or by block. If input is a block, the CSL interpreter detects main() function as the entry point.

CSL is static type. However, a function may not specify the variable type and the type check will be performed on interpretion. Type are required in compiling.

By line:

> 1+2*(3+4)
15
> abs(-5)
5

By block:

sum.csl:

import std;

def plus(x:int, y:int):int{
    return x + y;
}

def main():int{
    int a;
    int i;
    a = 0;

    for (i=0;i<5;i++){
        a = plus(a, i);
        printi(a);
    }
}

Execution:

Direct interpretion:

$csli sum.csl
1
3
6
10
15

Compile and run:

$cslc sum.csl
$./sum
1
3
6
10
15