I am trying to find the sum of two integers. I entered the following program into the Visual Studio and it is telling me that there are errors. Can someone tell me where they are please?
#include <stdio.h>
int main( void )
{
int integer1;
int integer2;
int sum;
printf( "Enter first integer\n" );
scanf( "&d", &integer1 );
printf( "Enter second integer\n" );
scanf( "%d", &integer2 );
sum = integer1 + integer2;
printf( "Sum is %d\n" , sum );
return 0;
}
Compilers usually tell you where the errors are. Some part of the output or screen should be saying something about a line number, or if you click on the error message in an IDE, it really should bring you to the line.
The only error I can see looks like a typo, where you typed an ampersand instead of a percent:
scanf( "&d", &integer1 );
should read
scanf( "%d", &integer1 );
Thanks! But even after I changed the ampersand, it still gives me an error. It says
error C2065: integer1 undeclared identifier
error C2065: integer2 undeclared identifier
and refers to the lines where there is the scanf of both integers.
OK. That would imply that the compiler isn't seeing the lines
int integer1;
int integer2;
or, more precisely, isn't seeing them as declaring local variables at that point.
Is it possible you've changed something unintentionally in trying to find a fix?
I just pasted the code above - your original code - into an old version of VC++ I have on my machine, fixed the percent in scanf, and the program compiles are runs perfectly.
Try doing exactly what I did, and see whether it works now.
It still won't work but thanks a lot!!
I don't know what happened but it worked now when I pasted the code that you used! Thanks a lot! You were really helpful :)
Great! I can' see the code I pasted a minute ago now. Dunno how that happened.
Anyway, get used to it! :-) One of the peculiarities of programming is that sometimes things mysteriously don't work, and then mysteriously do when you look at them again.
Actually, there's no mystery.
What happens is that, in looking at the same chunk of code again and again, you just stop seeing something wrong or obvious. Your eye sees it, but your brain ignores it.
The best remedy is to have somebody else take a look at the same code. It will likely be obvious to them. The next best is to type the offending line or lines in again, so that you won't ignore characters.
The effect never goes away, but you get better at handling it with practice.
Glad I could help!
In the code you provided, there are a couple of errors that are causing issues. I will explain each of them so you can fix them:
1. Incorrect format specifier in scanf:
In the line `scanf("&d", &integer1);`, you have used `&d` instead of `%d` as the format specifier. The correct format specifier for reading an integer is `%d`. So, you need to change that line to `scanf("%d", &integer1);`.
2. Missing angle bracket in #include directive:
In the first line of your code, you have used `#include <stdio.h>`. However, it seems like you forgot to include the closing angle bracket `>` in the directive. To fix this, you need to change that line to `#include <stdio.h>` so that it properly includes the standard input/output library.
After making these corrections, your program should work correctly. Here is the updated code:
```c
#include <stdio.h>
int main(void) {
int integer1;
int integer2;
int sum;
printf("Enter first integer: ");
scanf("%d", &integer1);
printf("Enter second integer: ");
scanf("%d", &integer2);
sum = integer1 + integer2;
printf("Sum is %d\n", sum);
return 0;
}
```
Now, when you run the program, it should prompt you to enter two integers and display their sum correctly.