User-defined Functions

dslang functions are defined using the same syntax as the C programming language.

Naming convention

Using snake_case as the naming convention is suggested. However, the user can use any other naming conventions as well.

Function: void

This is an example of a function that does not return any value (void). This code defines my\_func which prints two integers. It's called with arguments (1, 2). Then, it prints the hexadecimal value of variable my\_var, which is 79.

  void my_func(int var, int var2) {
    printf("var = %d, var2 = %d\n", var, var2);
    return;
    printf("this statement is never shown!\n");
  }

  //
  // call function
  //
  my_func(1, 2);

  int my_var = 79;
  printf("%x\n", my_var);

Function: int

This is an example of functions that return an integer. This code defines four functions: my\_func1, my\_func2, my\_func3, and my\_func4.

my\_func1: adds 1 to its argument and prints the result.

my\_func2: multiplies its argument by 2 and prints the result.

my\_func3: also multiplies its argument by 2 and prints the result.

my\_func4: calls my\_func1, my\_func2, and my\_func3, then sums their results and prints the total.

Finally, it calls my\_func4 with an argument of 2 and prints the result.

? {
    
  int my_func1(int var1) {
    result = var1 + 1;
    printf("my_func1 %d\n", result);
    return result;
  }
  
  int my_func2(int var1) {
    result = var1 * 2;
    printf("my_func2 %d\n", result);
    return result;
  }
  
  int my_func3(int var1) {
    result = var1 * 2;
    printf("my_func3 %d\n", result);
    return result;
  }
  
  int my_func4(int var1) {
    result = my_func1(var1) + my_func2(var1) + my_func3(var1);
    printf("my_func4 %d\n", result);
    return result;
  }

  printf("%d\n", my_func4(2));
}