Assigning a value to a variable gets stored in the wrong spot?
- by scribbloid
Hello,
I'm relatively new to C, and this is baffling me right now. It's part of a much larger program, but I've written this little program to depict the problem I'm having.
#include <stdio.h>
int main()
{
signed int tcodes[3][1];
tcodes[0][0] = 0;
tcodes[0][1] = 1000;
tcodes[1][0] = 1000;
tcodes[1][1] = 0;
tcodes[2][0] = 0;
tcodes[2][1] = 1000;
tcodes[3][0] = 1000;
tcodes[3][1] = 0;
int x, y, c;
for(c = 0; c <= 3; c++)
{
printf("%d %d %d\r\n", c, tcodes[c][0], tcodes[c][1]);
x = 20;
y = 30;
}
}
I'd expect this program to output:
0 0 1000
1 1000 0
2 0 1000
3 1000 0
But instead, I get:
0 0 1000
1 1000 0
2 0 20
3 20 30
It does this for any number assigned to x and y. For some reason x and y are overriding parts of the array in memory.
Can someone explain what's going on?
Thanks!
