Urgent Help for homework - sum and difference(100digits) with carry

I am not good at programming, my teacher gave me to write a program and i have to finish it in 2 days. Here is the program which i have to write

Write a program to determine the sum Z=X+Y and the difference Z=X-Y, where X, Y are n-digit integer decimal numbers and n<=100.

He showed me how does it has to start but i need to complate it. an someone help me to finish my program, here is the what he wrote;

Code:

n= 100
int x(100), Y(100), Z(101)

for (i=0, i<n,i++)
z[i]=x[i]+y[i]+c;
if (z[i]>9)
{c=1; z[i]=z[i]%10}

who can create a C++ program from this content. and plus i need to write it for z=x-y too

Originally Posted by Fatal1ty

who can create a C++ program from this content. and plus i need to write it for z=x-y too

I can.

In other words, you've made NO PROGRESS in the last 6 weeks.
Urgent Help for homework - sum and difference


Try this on paper

Code:

123456
   789 +
------

If you don't understand this much, then find an elementary maths text book.


Now imagine some boxes

Code:

+---+---+---+---+---+---+---+---+---+---+---+
| 0 | 0 | 0 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | \0|
+---+---+---+---+---+---+---+---+---+---+---+
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 8 | 9 | \0|
+---+---+---+---+---+---+---+---+---+---+---+
|   |   |   |   |   |   |   |   |   |   | \0|
+---+---+---+---+---+---+---+---+---+---+---+

Do the same, and keep track of which numbers go in which boxes.


Now imagine those boxes as char arrays

Code:

char n1[10] = "0000123456";
char n2[10] = "0000000789"
char n3[10] = "";

Repeat step 2, but mimic your actions as statements operating on the above arrays.

In other words, you've made NO PROGRESS in the last 6 weeks.

All aboard the failboat!