Simple calculator project errors

[runic spade]

I made a simple C programming calculator project including areas and volumes, but there are errors.
I have attatched my code and the instructions I had.

#include <stdio.h>

int main() {

    char name[100];

    printf("Hello! I am a computer, haha\n\n");

    printf("Enter your name:\n");

    scanf("%s", name);

//Calculate geometric formulas for using user Input

    const float PI = 3.14159265;

    float Area;
    float Volume;
    int Radius;
    int Height;

    printf("\n Hello Aaron! We will calculate some geometric formulas!\n");

//Area and volume of a sphere

    printf("\n Sphere: \n\n");

    printf("Enter the radius of the sphere: \n");

    scanf("%d", Radius);

    Area = Radius * Radius * PI
    Volume = 4*PI*Radius*Radius/3

    printf("/nArea is ==> {Area}");
    printf("/nVolume is ==> {Volume}");


}

[long fox]

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[tawny herald]

well your formulas are wrong

for both of the area and volume

[runic spade]

oh

oh wait yea

[knotty light]

printf("\n Hello Aaron! We will calculate some geometric formulas!\n");
You're supposed to use "name" here btw

[runic spade]

#include <stdio.h>

int main() {

    char name[100];

    printf("Hello! I am a computer, haha\n\n");

    printf("Enter your name:\n");

    scanf("%s", name);

//Calculate geometric formulas for using user Input

    const float PI = 3.14159265;

    float Area;
    float Volume;
    int Radius;
    int Height;

    printf("\n Hello Aaron! We will calculate some geometric formulas!\n");

//Area and volume of a sphere

    printf("\n Sphere: \n\n");

    printf("Enter the radius of the sphere: \n");

    scanf("%d", Radius);

    Area = Radius * PI * Radius * Radius;
    Volume = (4 * PI * Radius * Radius * Radius) / 3;

    printf("/nArea is ==> {Area}");
    printf("/nVolume is ==> {Volume}");
}

this is the code i have so far

IOVP.c:30:17: error: format specifies type 'int *' but the argument has type 'int' [-Werror,-Wformat]
    scanf("%d", Radius);
           ~~   ^~~~~~
fatal error: too many errors emitted, stopping now [-ferror-limit=]
2 errors generated.
make: *** [<builtin>: IOVP] Error 1
$ 

and this is the error i get

[tawny herald]

did your classes cover usage of scanf?

[runic spade]

yes

[tawny herald]

so you know that scanf needs the address of the variable it's supposed to put the value in right?

[runic spade]

yes

right

[tawny herald]

anything wrong when comparing that to what you're doing? 😛

[runic spade]

hmm

umm

what is wrong

[tawny herald]

you're not giving an address to scanf

[runic spade]

well it's supposed to take user input right?

[tawny herald]

it is, but it needs an address to fill the variable that you want, and you're not giving it an address

[runic spade]

what do you mean by an address

i think i know, but i just don't know like the word address

[tawny herald]

the address of the variable it's supposed to fill with the user input

like the memory address of that variable

have you learnt about pointers and/or memory in general yet?

[runic spade]

umm, i don't think so

but i did learn scanf

wait do u mean by

scanning user input

[tawny herald]

well that explains it then

[runic spade]

then storing it into "radius"

[tawny herald]

when you do scanf("%d", Radius);, you call scanf and give it a string and the value of Radius

scanf can do nothing meaningful with the actual value, it needs to write to Radius, that's what you want it to do

[runic spade]

right

[tawny herald]

so instead of giving scanf the value of Radius, you give its memory address: scanf("%d", &Radius);

[runic spade]

oh right

u use the &

[tawny herald]

with that scanf is able to write the user input at the correct place in memory, and that place in memory happens to be what you call variable Radius in your main funtion

& yields the memory address of whatever comes next, provided it has one

[runic spade]

ahh ok

is that the only problem you see so far with my code?

wait there is a problem

cus when I do name

it shows up as Hello name! We will calculate some geometric formulas!

[tawny herald]

as pointed out, you don't print the name that you queried before, you just print "Aaron" every time

[runic spade]

when i want it to take user input and store it in naem

printf("\n Hello name! We will calculate some geometric formulas!\n");

how do i change this code

printf("\n Hello %s! We will calculate some geometric formulas!\n", name);

is that it?

[tawny herald]

sounds about right

didn't your classes cover this as well?

[runic spade]

yes, it did

forgot lol

wait how do I add like

a line of space

printf("/nArea is ==> %f", Area);
printf("/nVolume is ==> %f", Volume);
}

so for this

/nArea is ==> 25.132742/nVolume is ==> 33.510323$

it shows up like that

[tawny herald]

because /n is not the newline character

/n is two characters, namely / and n

[runic spade]

oh

[tawny herald]

you used the newline character properly before 😛

[runic spade]

printf("Area is ==> %f\n", Area);
printf("Volume is ==> %f\n", Volume);

i think this does it?

[tawny herald]

go ahead and try it 👍

[runic spade]

it worked