NEWTON

Asked

3 months ago

118

views

0

Hello! This is day 9 of the 17 days of the Cairo Challenge. And I have no idea how to solve the playground exercise “Field Elements 2”. Perhaps you can help me?

```
// As you saw in the previous challenge, the operator '/' does not denote
// truncated (i.e., rounding down) integer division as in other programming
// languages. Instead, one can use library functions such as
// unsigned_div_rem().
//
// Note that unsigned_div_rem() does not work for negative numbers.
%builtins output range_check
// Import unsigned_div_rem() from the math module.
from starkware.cairo.common.math import unsigned_div_rem
from starkware.cairo.common.serialize import serialize_word
func main{output_ptr: felt*, range_check_ptr}() {
let (q, r) = unsigned_div_rem(value=12, div=3);
// Output the quotient (12 // 3).
serialize_word(q);
// Output the remainder (12 % 3).
serialize_word(r);
// Add code that outputs the quotient and remainder of 13 / 3 in addition to 12 / 3 here.
return ();
}
```

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N

Newton

asked

3 months ago

0

Accepted answer

```
%builtins output range_check
// Import unsigned_div_rem() from the math module.
from starkware.cairo.common.math import unsigned_div_rem
from starkware.cairo.common.serialize import serialize_word
func main{output_ptr: felt*, range_check_ptr}() {
let (q, r) = unsigned_div_rem(value=12, div=3);
// Output the quotient (12// 3).
serialize_word(q);
// Output the remainder (12 % 3).
serialize_word(r);
// Add code that outputs the quotient and remainder of 13 / 3 in addition to 12 / 3 here.
let (a, b) = unsigned_div_rem(value=13, div=3);
// Output the quotient (13// 3).
serialize_word(a);
// Output the remainder (13 % 3).
serialize_word(b);
return ();
}
```

```
Program output:
4
0
4
1
Number of steps: 70
Program hash: 0x0238e10075bbd2ad40c6275fc85e62ffd27a649bd13415ae8b74a5ff49647509
```

**unsigned_div_rem** function signature looks like this:

```
func unsigned_div_rem{range_check_ptr}(value, div) -> (q : felt, r : felt):
```

It accepts two argument value and div. The value of div is restricted to make sure there is no overflow and it returns quotient and remainder such that:

`0 <= q < rc_bound, 0 <= r < div and value = q * div + r`

IR

Ishita Rastogi

answered

3 months ago

0

Here is my solution for today's challenge

```
%builtins output range_check
// Import unsigned_div_rem() from the math module.
from starkware.cairo.common.math import unsigned_div_rem
from starkware.cairo.common.serialize import serialize_word
func main{output_ptr: felt*, range_check_ptr}() {
let (q, r) = unsigned_div_rem(value=12, div=3);
// Output the quotient (12 // 3).
serialize_word(q);
// Output the remainder (12 % 3).
serialize_word(r);
// Add code that outputs the quotient and remainder of 13 / 3 in addition to 12 / 3 here.
let (q2,r2) = unsigned_div_rem(value=13, div=3);
serialize_word(q2);
serialize_word(r2);
return ();
}
```

answered

3 months ago

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