what's wrong with this code ?
Code:// Random walk
#include <stdio.h>
#include <time.h>
#include <stdlib.h>
void set();
void print();
void generate();
int possible(int, int);
char a[10][10];
int main()
{
set();
generate();
print();
return 0;
}
void set()
{
int i=0;
int j = 0;
for(i = 0; i < 10; i++)
for(j = 0; j < 10; j++)
a[i][j] = '.';
}
void print()
{
int i,j;
for(i = 0; i < 10; i++){
for(j = 0; j < 10; j++)
printf("%c ", a[i][j]);
printf("\n");
}
}
void generate()
{
int m,n;
int next;
int step = 'A';
m = n = 0;
a[m][n] = step;
while(1){
srand((unsigned) time(NULL));
next = rand() % 4;
// printf("%d\n", next);
step += 1;
if(next == 0 && possible(m + 1, n)){ // move to right
m += 1;
a[m][n] = step;
} else if(n == 1 && possible(m, n+1)){ // move down
n += 1;
a[m][n] = step;
} else if(n == 2 && possible(m - 1, n)){ //move left
m -= 1;
a[m][n] = step;
} else if(n == 3 && possible(m, n-1)){ // move up
n -= 1;
a[m][n] = step;
}else
break;
}
}
int possible(int m, int n)
{
return m >= 0 && m <= 9 && n >=0 && n <= 9;
}