How does VC get the current selected content, I want to get a shortcut to add 20

In fact, it is very simple to use C to make a form, but it is very difficult to make a form with C++, and it is necessary to write a lot. We don't need to use the tools of such a county, why should it be so complicated? The procedure for calculating addition is simple on c and is still visual.

If you really want it, search the Internet and I'm sure you'll find the resources you want

Is it a lot harder to use C++?

Actually, it's pretty much it.

There are a lot of calculators on the Internet, so let's go next.

Because 1 is an integer.

1 100 is an integer (0).

1 100 * 100 = 0 * 100 = 0 Integer and then assign the 0 of the integer to the a of the double type, which is still 0.

You want to do this: double a = 100 * 100;

Did you make a mistake for(i=0; i<10,i++) should be for(i=0; i<10;i++)

In this case, the answer is 64 36 otherwise it is wrong.

64 36

The squares of a[0] and a[5] are output, respectively.

Converting an infix expression (i.e., a general arithmetic expression) into a suffix expression (using a stack) is a data structure thing, and a lot of search is on the Internet.

There is a priority of various symbols involved.

In addition, if it is a large number calculation, it is necessary to use a string to store the ** below the number is an example.

For classes on the Internet, you can get the result by passing the string in the box directly, which is very convenient.

Here's how the calculator works:

Enter 4, reaction.

Enter + to determine whether it is an operator or not, if yes, record the last value to x1, record operator a1 enter 5, and record x2

Enter + to determine whether it is an operator or not, if a1 and x1 exist, the result of the calculation, displayed, recorded in x1, recorded operator a1.

It's easy to figure out the process first, and get it into the MFC. If it's not scientific computing, use stacks.

I don't understand it.,Is it a stipulation int?,Isn't it better to float the point type?,See if it works.,Use itof and then calculate.,And then split the calculation result (with decimals) with modf.,Then convert integers and decimal numbers (need to be multiplied by precision) ITOA into strings and then strcat splicing is not OK......Check out this post to see if it helps.

The first thing to correct is that i doesn't have an initial value, so your program should be.

#include

int main()

int i = 6 , j;

Secondly, if the initial value is assigned, then the result should be 25 instead of 16, and 16 should be one less ++i

The result of pressing i=6 is 25 instead of 27. The reason is a matter of priority.

The priority of +i)+(i)+(i) should be that the first two (++i)+(i) are computed as a group, and the result of i is 8 and the result is 16

Add to that the last ++i, which is 9, and the result is 25....

For this, please refer to the two books C Expert Programming or C Defects and Pitfalls... It's good for you to look at the details!

Our teacher said this, this is a defect of C!

Then you have to buy a book to read or a book. It's better to have an instance. There's something like what you're going to do.

Right-click on your control box... Just add variables...