Thread: strange behavior of arrays in loop

I am solving interesting yet easy program.

the program works almost fine but it has strange bug that occur and im lost cuz i have no idea why it happens
I have mine field that spread mines , o is for empty space , " . " is for space where cannot be placed mine and ! is where "miner is" , he spread bombs in this direction

o o o o
o . ! o
o o o o

he would spred mines around him if is possible so in this case it would spread like this

o o ! o
o . x !
o o ! o i put the x on the original place of miner , the spreading continue till every place where mine can reach is mined. But i do not know when and why somewhere it code it just breaks and the "miner" does not spread mine in the direction he should.

First in my code i find the position of miner/s i store their x and y position in
indexX[];
indexY[];
this arrays have same length of items , so i have variable index which incerement every time something should be added.
then i loop throught arrays and if i find match ( ! ) i check if surrounding can be mined if yes add it there , everything works but somehow sometimes it just broke and i do not know why Here is paste bin [C] #include <stdio.h> #include <stdlib.h> int main() { int days=0; i - Pastebin.com as you can see in 3rd and 5th mine field , it spreaded not how ist supposed to be , how can i fix it?

Code:

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int days=0;
    int i;
    int j;
    int indexX[15];
    int indexY[15];
    int index=0;
    int x=4;
    int y=4;
    int pocet_nakazenych=0;
    char nakaza[4][4]={{'o','o','o','o'},{'o','.','o','o'},{'o','.','.','o'},{'!','o','.','o'}};
    int tmp=0;
    int changes=0;
    int ass=0;
    for(i=0;i<x;i++){
        for(j=0;j<y;j++){
            if(nakaza[i][j]=='!'){
                nakaza[i][j]='x';
                indexX[index]=i;
                indexY[index]=j;
                index++;
                pocet_nakazenych++;
            }

        }
    }
    tmp=index;
    do{
        for(i=0;i<x;i++){
            for(j=0;j<y;j++){
                if(nakaza[i][j]=='!'){
                    nakaza[i][j]='x';
                }

            }
        }

    changes=0;
    for(i=0;i<index;i++){
        if(!(indexX[i]+1>x-1)){
                if( nakaza[indexX[i]+1][indexY[i]]!='.' &&  nakaza[indexX[i]+1][indexY[i]]!='x' && nakaza[indexX[i]+1][indexY[i]]!='!'){
                    nakaza[indexX[i]+1][indexY[i]]='!';
                    pocet_nakazenych++;
                    indexX[tmp]=indexX[i]+1;
                    indexY[tmp]=indexY[i];
                    printf("Nakaza %d:%d xhore\n",indexX[tmp],indexY[tmp]);
                    printf("plati pre indexX=%d indexY = %d\n",indexX[i],indexY[i]);
                    tmp++;
                    changes++;

                }
        }
        if(!(indexX[i]-1<0)){
                if( nakaza[indexX[i]-1][indexY[i]]!='.' &&  nakaza[indexX[i]-1][indexY[i]]!='x' &&  nakaza[indexX[i]-1][indexY[i]]!='!'){
                    nakaza[indexX[i]-1][indexY[i]]='!';
                    pocet_nakazenych++;
                    indexX[tmp]=indexX[i]-1;
                    indexY[tmp]=indexY[i];
                    printf("Nakaza %d:%d xdole\n",indexX[tmp],indexY[tmp]);
                    printf("plati pre indexX=%d indexY = %d\n",indexX[i],indexY[i]);
                    tmp++;
                    changes++;

                }
        }
        if(!(indexY[i]+1>y-1)){
                if( nakaza[indexX[i]][indexY[i]+1]!='.' &&  nakaza[indexX[i]][indexY[i]+1]!='x' &&  nakaza[indexX[i]][indexY[i]+1]!='!'){
                    nakaza[indexX[i]][indexY[i]+1]='!';
                    pocet_nakazenych++;
                    indexX[tmp]=indexX[i];
                    indexY[tmp]=indexY[i]+1;
                    printf("Nakaza %d:%d ydoprava\n",indexX[tmp],indexY[tmp]);
                    printf("plati pre indexX=%d indexY = %d\n",indexX[i],indexY[i]);
                    tmp++;
                    changes++;

                }
        }
        if(!(indexY[i]-1<0)){
                if( nakaza[indexX[i]][indexY[i]-1]!='.' &&  nakaza[indexX[i]][indexY[i]-1]!='x' &&  nakaza[indexX[i]][indexY[i]-1]!='!'){
                    nakaza[indexX[i]][indexY[i]-1]='!';

                    pocet_nakazenych++;
                    indexX[tmp]=indexX[i];
                    indexY[tmp]=indexY[i]-1;
                    printf("Nakaza %d:%d ydolava\n",indexX[tmp],indexY[tmp]);
                     printf("plati pre indexX=%d indexY = %d\n",indexX[i],indexY[i]);
                    tmp++;
                    changes++;

                }
        }
    }

    index=tmp;

    tmp=0;
    if (changes!=0){
        days++;

    }else{
        break;
    }
    for(i=0;i<x;i++){
        for(j=0;j<y;j++){
           printf("%c ",nakaza[i][j]);
        }
        printf("\n");
    }
    printf("days = %d\n",days);
    }
    while(changes);
    for(i=0;i<x;i++){
        for(j=0;j<y;j++){
           printf("%c ",nakaza[i][j]);
        }
        printf("\n");
    }


    printf("dni = %d\npocet nakazenych = %d",days,pocet_nakazenych);


}

I wish I understood the rules for this game, but I don't

Edit: Even though I don't understand the rules I do think that your program can be simplified (or at least made easier to read). Have you learned about functions yet?