Binary C Track

[fossil robin]

Hello i want to make this exercise. But first i dont know how to make an int from a string

[rotund zephyr]

Which track? What have you tried so far?

[fossil robin]

I tried nothing for the moment

because first i have to use an int

I don't see how I can convert directly from a string.

i have a doubt

i make this

for the moment

I think it makes more sense to use an integer rather than a string.

[rotund zephyr]

In general please share codeblocks, not images. For example, you can type the following. Note, the ``` must be on their own line.
```
for number in range(10):
total += number;
```
Discord will render that as so:

for number in range(10):
    total += number;

Click here to learn more about codeblocks: https://exercism.org/docs/community/being-a-good-community-member/writing-support-requests and http://bit.ly/howto-ask

[fossil robin]

Thank you for this

int convert(const char *input){
    if(!convert) return NULL;

    


}```

[rotund zephyr]

But more importantly what track is this for? Exercism offers 77 tracks so letting us know which one you’re working on will help us help you.

[fossil robin]

Its C track

[rotund zephyr]

Can you update the thread title please to reference the track for increased visibility?

[tulip storm]

The instructions say to do it from first principles. How would you convert that by hand using only paper and pencil?

[fossil robin]

Okay no problem

Binary C Track

[fossil robin]

I understand how to convert from binary to decimal

But i dont know how to do this in C with a string

[tulip storm]

Start by writing out the steps in English. Then, if there's any specific bit you can't figure out how to translate from English to C, you can ask about that specific step, vs saying you don't know how to do any of it.

Which part of the conversion are you having trouble with?

[fossil robin]

Finally i understand how to proceed

we have a string but its an array

[tulip storm]

Yes. That's how C strings work 😉 A string is a series (array) of characters.

[fossil robin]

I have to write a C program that converts a binary string into a decimal number. To do that, I’ll first check if the string only contains '0' and '1', and then I’ll use the position of each bit to compute its corresponding power of 2 and add it to the result.

[fossil robin]

thank you

[tulip storm]

Sounds like a plan. For bonus points, try to solve it without doing any exponent operators 🙂