Assembly Language for Beginners

1.20. ARRAYS

Row filling example

Let’s fill the second row with these values 0..3:

Listing 1.244: Row filling example

#include <stdio.h>

char a[3][4];

int main()
{
int x, y;

// clear array

for (x=0; x<3; x++)

for (y=0; y<4; y++)

a[x][y]=0;

// fill second row by 0..3:
for (y=0; y<4; y++)
a[1][y]=y;
};

All three rows are marked with red. We see that second row now has values 0, 1, 2 and 3:

Figure 1.92:OllyDbg: array is filled

Column filling example

Let’s fill the third column with values: 0..2:

Listing 1.245: Column filling example

#include <stdio.h>

char a[3][4];

int main()
{
int x, y;

// clear array

for (x=0; x<3; x++)

for (y=0; y<4; y++)

a[x][y]=0;

// fill third column by 0..2:
for (x=0; x<3; x++)
a[x][2]=x;
};

The three rows are also marked in red here.

We see that in each row, at third position these values are written: 0, 1 and 2.

Figure 1.93:OllyDbg: array is filled