Thread: 2D array-moving a varible about problem

Hi,
have iniatlised all elements in a array to zero except for [1][1],where its value is 1.I then try to move it up,down left and right.It seems to work for down,left and right but when you press up it goes to position[0][0] instead of [0][1]

Code:

#include<iostream>
#include<string>
#include<ctime>
#include <stdlib.h>
#include"test.h"
using namespace std;
void printArray( int theGrid[][3])
{
	cout<<theGrid[0][0]<<" "<<theGrid[0][1]<<" "<<theGrid[0][2]<<endl;
    cout<<theGrid[1][0]<<" "<<theGrid[1][1]<<" "<<theGrid[1][2]<<endl;
    cout<<theGrid[2][0]<<" "<<theGrid[2][1]<<" "<<theGrid[2][2]<<endl;
}




int main(int argc,char* argv[])
{ 

	int theGrid[3][3]={  {0,0,0},
	                     {0,1,0},
	                     {0,0,0}};
	printArray(theGrid);
	char playerInput;
	cin>>playerInput;

	switch(playerInput){
		case 'w':
			for(int row=0;row<3;row++){
				for(int col=0;col<3;col++){
					if(theGrid[row][col]==1){
						cout<<"test-where 1 is  at first- [1][1] "<<row<<" "<<col<<endl;
						theGrid[row][col]=0;//changes where 1 was to 0
						row-=1;
						cout<<"test-where 1 is  at after being moved-[0][1] "<<row<<" "<<col<<endl;
						theGrid[row][col]=1;//changes new position from 0 to 1
					}}}
	    case 'a':
			for(int row=0;row<3;row++){
				for(int col=0;col<3;col++){
					if(theGrid[row][col]==1){
						theGrid[row][col]=0;
						col-=1;
						theGrid[row][col]=1;
					}}}
			break;
		case 'd':
			for(int row=0;row<3;row++){
				for(int col=0;col<3;col++){
					if(theGrid[row][col]==1){
						theGrid[row][col]=0;
						col+=1;
						theGrid[row][col]=1;
					}}}
			break;
		case 's':
			for (int row=0;row<3;row++){
				for(int col=0;col<3;col++){
					if(theGrid[row][col]==1){
						theGrid[row][col]=0;
						row+=1;
						theGrid[row][col]=1;
					}}}
			break;
		default:		
			break;
	}
			printArray(theGrid);
	
	return 0;
}

the case for down('s')works.Its the same code as for up but 1 is added to row..but if i put col+=1 in to the case for up it puts the value 1 in right place....