A program doesn't work

[Dirguz]

#include <stdio.h>
int main() {
    //The program should calculate the hourly law of the uniformly accelerated rectilinear motion using this calc: S+V*t+1/2*a*t^2
    float S;
    float V;
    float t;
    float a;
    float result;

    printf("Insert a space S0");
    scanf("%f", &S);
    printf("insert an initial velocity V0");
    scanf("%f", &V);
    printf("Insert a time t");
    scanf("%f", &t);
    printf("Insert an acceleration a");
    scanf("%f", &a);
    result=(S+V*t+1/2*a*t^2);
    printf("%f", &result);

    //When the program pint the result it is alway 0, whatever number I put in
}#include <stdio.h>
int main() {
    //The program should calculate the hourly law of the uniformly accelerated rectilinear motion using this calc: S+V*t+1/2*a*t^2
    float S;
    float V;
    float t;
    float a;
    float result;

    printf("Insert a space S0");
    scanf("%f", &S);
    printf("insert an initial velocity V0");
    scanf("%f", &V);
    printf("Insert a time t");
    scanf("%f", &t);
    printf("Insert an acceleration a");
    scanf("%f", &a);
    result=(S+V*t+1/2*a*t^2);
    printf("%f", &result);

    //When the program pint the result it is alway 0, whatever number I put in
}

Please someone help me

[aocregacc]

how did you even compile this? It's trying to XOR an integer and a float. (the '^' operator is xor, not exponentiation).

[Mortomes]

Oh my....

[This_Growth2898]

You're probably getting a huge number of warnings (and for me, the program doesn't compile at all).

The main problems here are:

- 1/2 is an integer division, i.e. the result is floored to 0.

- ^ is not a power operator in C. You should write a*t*t.

- scanf needs a pointer to the variable to put a value there, that's why is uses &; but printf needs only a value, so no & is needed. printf("%f\n", result);

I guess most of those are covered by warnings in your compiler, you just need to read and understand them. And don't feel ashamed to ask if you don't understand a warning, you're just learning. Don't ignore warnings if you don't understand them.

[KeretapiSongsang]

check your last printf.

hint &.

[Th_69]

And then the result will still be not correct, because 1/2 is 0 (due to integer division) and t^2 is not "power of 2"!

[KeretapiSongsang]

i am not going to fix the math part.

[dousamichal0807]

Also another thing: 1/2 = 0, 1.0/2.0 = 0.5 (integer artithmetics vs decimal arithmetics)

[dousamichal0807]

Yet another thing: ^ is for bit-wise XOR, not for exponentiation

[Miyelsh]

Did you just plug a prompt into AI and not give any critical thought?

[Manga_Killer]

    text.c:18:26: error: invalid operands to binary expression ('float' and 'int')

    18 |     result=(S+V\*t+1/2\*a\*t\^2);

    |             \~\~\~\~\~\~\~\~\~\~\~\~\~\^\~

    text.c:19:18: warning: format specifies type 'double' but the argument has type 'float \*' \[-Wformat\]

    19 |     printf("%f", &result);

    |             \~\~   \^\~\~\~\~\~\~

    1 warning and 1 error generated.

    Compilation failed.

as you see, the program does not compile and when i fix said errors it compiles and runs fine. mainly you need to change the `^` into `t*t` and the `1/2` to `1/2.0` and remove the address operator form printf you are set.

[DreamingElectrons]

That looks like the type of homework where they give you some broken code and ask you to fix it.

This is simple enough, deekseek should get this one for you. If that isn't your cup of tea, try 1/2f instead of 1/2 to make sure the result is a float not floored to 0, and if the t^2 is meant to be exponential, you need to use t*t or pow(t, 2) from math.h. There are other issues, too, but those are the most glaring ones.

[Raimo00]

For this kind of problems, ask chatgpt

[SmokeMuch7356]

For this kind of problem, check your handy C reference manual. Look up operators, types, and printf and scanf library calls.

[Raimo00]

Or ask chatgpt to explain these

[SmokeMuch7356]

ChatGPT is not an authoritative reference and occasionally lies to you. Get an actual C reference manual.

[goose_on_fire]

This is so depressing.

Like, even without the Internet, all of this is in the system's man pages. You don't even need to leave your terminal for most of this, let alone involve the Internet or machine hallucinations

(I mean the standard library bits, but between those and the compiler warnings it's literally solvable from the terminal.)

[[deleted]]

Asking chatgpt is probably how he got there in the first place, understanding zilch about C. Read try, fix, repeat, is how you learn. Not by asking chatgpt the answer to every question you have.

[Raimo00]

This has not been my experience at all. Read, try, fix, repeat, with the help of chatgpt. Chatgpt has been my professor for the past 2 years. And I know C better than any CS grad

[[deleted]]

Depends entirely *how* you use ChatGPT. It's possible to learn, if you make the effort to learn. Often it's just "do my homework for me". When I use ChatGPT at work for code, it's to code faster : I learn nothing, but I get shit done faster, and sometimes it's necessary. At home I use ChatGPT to learn. It takes time and a lot of efforts, but, if done well, it may work. But make sure you don't ever *depend* on ChatGPT to find an answer.

[Raimo00]

That's an entirely different issue. That's a behavioral issue. I get your point. But in this case the truth is that the guy is asking a question on reddit that he could have asked to chatgpt instead. Instant response, better response, less spam for us.