Question

how do i: Write a program to input 2 numbers, first and diff. The program will then create a one-dimensional array of 16 elements in an arithmetic sequence which is printed out.
 For example, if first is 21 and diff = 5, the arithmetic sequence will be:
 21 26 31 36 41 46 51 56 61 66 71 76 81 86 91 96

Answer 1

since you didn't specified any language so here's a program in python

first = input('Enter the first number: ')
diff = input('Enter the difference among the numbers: ')
count=0
while count < 16:
print first
first = first + diff
count+=1

Answer 2

int output[] = new output[16];
for (int i=0, i<16, i++)
{
output[i] = first + (diff * i);
}

It helps to ask a more specific question so we know what you're stumped on exactly and if you need to know something in a particular language or if psuedo code is suitable. I've answered above only what I guess would be the most trivial part of your problem, in a C#/Java-like language.

Answer 3

First thing to tell scherniak, please specify the language you use.
So, other can help you.

Answer 4

Thanks a alot! How can i do the same with a 2d array (in java)?

Answer 5

Be more specific - what exactly do you want to do with the 2d array?

Answer 6

input 2 numbers, first and diff. The program will then create a two-dimensional array of 4x4 in an arithmetic sequence which is printed out.
For example, if first is 21 and diff = 5, the arithmetic sequence will be:
21 26 31 36
41 46 51 56
61 66 71 76
81 86 91 96

Answer 7

for(int i = 0;i<4;i++)
{
for(int j = 0; j<4; j++)
{
output[i][j] = (cant figure out what to put here)
}

}

Answer 8

Ah okay.
output[i][j] = first + (diff * ((i * 4) + j) );

Answer 9

also... how can i reverse the diagonals? eg.

have no idea how to approach this

96 26 31 81
41 71 66 56
61 51 46 76
36 86 91 21

Answer 10

Here's one way you could do it:

for(int i = 0;i<4;i++)
{
for(int j = 0; j<4; j++)
{
if (i==j) { output[i][j] = first + (diff * ( ((3-i) * 4) + (3-j) ); }
else { output[i][j] = first + (diff * ((i * 4) + j) ); }
}

}