Adding numbers to a grid C - c

Question

So I am relatively new to C and have been practicing questions on it. So I came across the question, 'Where can I go?': http://www.chegg.com/homework-help/questions-and-answers/c-coding-java-c--c-coding-bouncy-string-tasked-write-program-take-parameters-command-line--q19411844
I manage to write a part of the code, but I am not sure how to get this
| | | |
| | | |
| | | |
| |X| |
I somewhat have the logic of when the counter for width = x - 1, counter for width = x + 1, counter for height = y - 1 (basically the first few steps that can be moved to from the starting position, X) the numbers placed there would be limit - 1.
Same for when it goes on
for i less than or equal to limit
the spaces between the limit - 1, will now be filled with limit - 2. So it will be like x-1 && y-1, y-2, y-1 && x+1, x+2 and so on until the last where 0 is placed.
But how do you write this and fix it in the for loop?
#include <stdio.h>
#include <stdint.h>
#include <string.h>
int main()
{
int width, height, x, y, max;
printf("Enter width: ");
scanf("%d\n", &width);
printf("Enter height: ");
scanf("%d\n", &height);
printf("Enter x: ");
scanf("%d\n", &x);
printf("Enter y: ");
scanf("%d\n", &y);
printf("Enter walking limit: ");
scanf("%d\n", &max);
int b = 0, a = 0; // initalize local variable
for (a = 0; a < height; a++) {
// fill the width
for (b = 0; b < width + 1; b++ ) {
printf("|");
if (b==x && a==y)
{
printf("X");
}else if(((b==x-1) && (a==y)) || ((b==x+1) && (a==y)) || ((a==y-1) && (b==x)))
{
printf("%d", max-1);
}else if(//i am not sure if this will be needed)
{
for(int i = 2; i <= max; i++)
{
//add max - i to spaces after C until max is over.
}
}
}
printf("\n");
}
return 0;
}

Answer 1

You should split your code in several functions.
I have done a quick example below.
First we need a function to display the array.
You need to create your array, see the malloc.
Then you set the max steps at the correct position.
Then you need a function to do the propagation, this is a very naive way to do.
Scan the array and set to the value minus one all the cell around.
Do it max times.
For example:
Enter width: 9
Enter height: 9
Enter x: 3
Enter y: 7
Enter walking limit: 3
| | | | | | | | | |
| | | | | | | | | |
| | | | | | | | | |
| | | | | | | | | |
| | | |0| | | | | |
| | |0|1|0| | | | |
| |0|1|2|1|0| | | |
|0|1|2|3|2|1|0| | |
| |0|1|2|1|0| | | |
The code
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
static void array_print(int *array, int width, int height)
{
for (int i = 0; i < height; i++) {
printf("|");
for (int j = 0; j < width; j++) {
int val = array[i * width + j];
if (val < 0) {
printf(" |");
} else {
printf("%d|", val);
}
}
printf("\n");
}
}
/**
*
* Update the array if x, y is inside the limit and
* if val is greater than the already set value
*
*/
static void
array_upate(int *array, int width, int height, int x, int y, int val) {
if (x >= 0 && x < width && y >= 0 && y < height) {
int prev = array[y * width + x];
if (val > prev) {
array[y * width + x] = val;
}
}
}
static void array_propagate(int *array, int width, int height)
{
for (int i = 0; i < height; i++) {
for (int j = 0; j < width; j++) {
int val = array[i * width + j];
if (val > 0) {
array_upate(array, width, height, j, i - 1, val - 1);
array_upate(array, width, height, j, i + 1, val - 1);
array_upate(array, width, height, j - 1, i, val - 1);
array_upate(array, width, height, j + 1, i, val - 1);
}
}
}
}
int main()
{
int width, height, x, y, max;
int *array;
printf("Enter width: ");
scanf("%d", &width);
printf("Enter height: ");
scanf("%d", &height);
printf("Enter x: ");
scanf("%d", &x);
printf("Enter y: ");
scanf("%d", &y);
printf("Enter walking limit: ");
scanf("%d", &max);
/* allocate the array */
array = malloc(sizeof(int) * width * height);
/* Set all to -1 */
memset(array, -1, sizeof(int) * width * height);
/* set the start to max */
array_upate(array, width, height, x, y, max);
/* do the propagation */
while (max-- > 0) {
array_propagate(array, width, height);
}
array_print(array, width, height);
free(array);
}