Copying values from one array to another - c

Question

It should be simple,two arrays,one with 5 other with 6 elements.
#include <stdlib.h>
#include <stdio.h>
int main()
{
int i=0;
int k=0;
int v[5] = {2,3,4,5,6};
int g[6];
for( i = 1; i <= 6; i++ ){
k= i + 1;
if ( 1 == i && 2 == i)
{
g[k]=v[i];
}
else
{
g[k]=(v[i]+10);
}
printf("%d\n",g[k]);
}
return 0;
}
I got this
13
14
15
16
32776
10
I really wanted
2 3 13 14 15 16
Where is my mistake?Should I create function or what?

Answer 1

Problem 1
Array indexes are 0-based, meaning v[0] and g[0] are the first element of the arrays. All your i and k are off by one 1.
Problem 2
1 == i && 2 == i is never true. If 1 == i, then 2 != i. If 2 == i, then 1 != i.
1 == i && 2 == i
should be
1 == i || 2 == i
Problem 3
Your loop has 5 passes, but it requires 6!
1) g[0] = v[0];
2) g[1] = v[1];
3) g[2] = v[1]+10;
4) g[3] = v[2]+10;
5) g[4] = v[3]+10;
6) g[5] = v[4]+10;
Solution
#include <stdlib.h>
#include <stdio.h>
int main() {
int v[5] = {2,3,4,5,6};
int g[6];
for( int i = 0; i < sizeof(g)/sizeof(*g); ++i ) {
if ( 0 == i || 1 == i )
g[i] = v[i];
else
g[i] = v[i-1]+10;
printf("%d\n", g[i]);
}
return 0;
}
Note that
if ( 0 == i || 1 == i )
can be simplified to
if ( 2 < i )

Answer 2

Your code has a few problems:
if ( 1 == i && 2 == i) will always return false as a variable cannot be both 1 and 2 at the same time.
Your loop iterator takes values larger than they should; when i becomes 5 and 6, v[i] and g[i] triggers reads to memory locations beyond the respective arrays' memory ranges, which explains the random values in your output.
I think this is what you want:
#include <stdlib.h>
#include <stdio.h>
int main()
{
int i = 0;
int v[5] = {2, 3, 4, 5, 6};
int g[6];
for ( i = 0; i < 6; i++ )
{
if ( i < 2 )
{
g[i] = v[i];
}
else
{
g[i] = ( v[i - 1] + 10 );
}
printf ( "%d\n", g[i] );
}
return 0;
}
Output:
2 3 13 14 15 16

Answer 3

It never enter in the if conditional block because i cannot be 1 and 2 at the same time..
So your code will enter just in else...
and it wil start from index 1;
so in this expresion from else : g[k]=(v[i]+10); --- v[i]=> 3 and when you arrive at index 5 or 6 it is outside of your v array....
for( i = 1; i <= 6; i++ ){
k= i + 1;
if ( 1 == i && 2 == i) //never enter here...
{
g[k]=v[i];
}
else
{
g[k]=(v[i]+10); //index get outside the vector length
}
printf("%d\n",g[k]);
}