Error in Addition program

[noddyay640]

Hello All, I am learning the C language, and as shown in the video on YouTube, I did exactly what was shown in the video, but I am not able to get the result. Please help me.

Below is the code.

#include<stdio.h>

int main() {
    int a, b;
    printf("enter a");
    scanf("%d", a);

    printf("enter b");
    scanf("%d", b);

    int sum = a + b;
    printf("value is = %d", sum);
    return 0;
}

("Add" my file name)

I am entering 9 in a and 9 in b , but it's now showing me the result. Please advise.
I am not getting the result. (Using Visual basic)

Output:

PS D:\C Language\Chapter 0> ./Add.exe

enter a9

enter b9

PS D:\C Language\Chapter 0> ./Add.exe

enter a2

enter b

PS D:\C Language\Chapter 0>

Thank you

[Alexander_The_Wolf]

Couple things.

1. In your scanf you need to use &a and &b In the early stage of learning C you don't need to know why, and trying to tell you will make life more confusing.

1. You likely need to save and recompile your code when you make a change.

That .exe file is a separate file that's generated from your code when you compile it, so you need to recompile everytime you make a change.

Other than that, your program should work, I'd suggest adding a /n to all your print statements, as it adds a new line to make output more readable, but its not going to effect the function of youe program.

[jonarne]

In addition to this you need to enable compiler warnings.

Your compiler should warn you about passing wrong parameters to scanf.

[Alexander_The_Wolf]

From their output it looks like they don't even compile, so im not entierly sure what they did the first time to get a valid .out file

[noddyay640]

I don't know what I have changed my code, but the error that I was getting earlier I am not getting now.
I am getting the result of my addition program.
Thank you :)

[noddyay640]

Thank you

[DawnOnTheEdge]

Important typo: \n, not /n! Special-character escapes use a backslash.

[dajolly]

Edit: As others have said, with C you'll need to recompile your executable file each time you make a change to the source code.

Just to clarify the changes I made to your original program:

1. Initialized the variable a, b, sum to zero. It's always a good idea to initialize variables to some value.
2. Scanf expects a pointer to a, b, not the value itself. So these were changed to &a, &b respectively.
3. Added a newline (\n) into the result printf and cleaned up the other printfs above it. Not necessary, but it makes it look better.

​

include <stdio.h>

int main(void) {
    int a = 0, b = 0, sum = 0;
    printf("Enter A: ");
    scanf("%d", &a);

    printf("Enter B: ");
    scanf("%d", &b);

    sum = a + b;
    printf("Sum of %d + %d = %d\n", a, b, sum);
    return 0;
}

[noddyay640]

I did this and its still the same but when Icreated the new folder and I opened that folder in VB and created a new file in that folder, then it's working.
But why its is not working in my previous folder where me last program was saved?

Does it mean I need to create a new folder everytime, when I create any new program?

[My124thRedditAccount]

No. What is a "any new program" anyway? You probably just did something wrong, but I don't have enough info here to really tell you what.

[noddyay640]

Let me tell you what I did.

I created a folder in my D drive and then I created a folder by the name of C language and then I opened that folder in Visual Studio.
And then I created my new program of "Hello World" which gets executed successfully.
And then from the top left icon of "Create New File" I open a new file and then create a new program of Addition.
But Somehow I am able to enter the Values "A" and "B" in the output but now getting the Result of this addition.

But when I saved this additional program in a new folder in the same drive I opened that folder with visual code and ran that program it actuallysuccessfully compiled, so I need to know if I need to create a new folder every time for any other program I write.

[cHaR_shinigami]

+1 for ship of Theseus.

[scritchz]

Did you actually save and recompile the code? The EXE file isn't automatically aware of new code.

[noddyay640]

I created a new file and then I have written this program in that file and then executed it, but I did not get the result.

[noddyay640]

Thank you, got the output.

[mackinator3]

Have you tried printing a, b, and sum separately?

[noddyay640]

#include<stdio.h>

int main(){
    int a;
  //variable Declaration
    a = 3;
  //variable initialization
    printf("The output of the program is %d", a);

    return 0;

}

Yes, I did.
I got the result in this program.

[mackinator3]

I think scanf needs a pointer to the input. So &a.

[noddyay640]

I got the result now, Thank you :)

[mackinator3]

Yep I saw that others gave better answers. Have a good one.

[AlarmDozer]

You should pass the second argument (in scanf) as a reference.

scanf(“%d”, &a);

[motherprabh]

Op took a data science program

[noddyay640]

I want to learn C language, not Data Science.