CODEWITHSUNDEEP
c
João Figueiredo
João Figueiredo

Reputation: 107

Strange Output while using the iterating variable of a "for" loop in C

I'm currently developing a simple naval battle game for my first exam at my college but i'm getting a strange output on my gameboard...

GameBoard

It should be iterating my "j" variable, but instead I get that strange character...

Here's my code: 

//CREATES COORDENATES OF THE GAMEBOARD
    //ATTRIBUTE ONE LETTER TO EACH TRAY LINE
        for (i=0;i<11;i++){
            tabuleiro[i][0] = letra[i-1];
        }
    //ATTRIBUTE ONE NUMBER TO EACH TRAY COLUMN
        for (j=1;j<11;j++){
            tabuleiro[0][j] = j;
        }

    //CREATES THE "SEA"
        for (i=1;i<11;i++){
            for (j=1;j<11;j++){
                tabuleiro[i][j] = '~';
            }
        }

I've tryied to change my tabuleiro[0][j] = j; to tabuleiro[0][j] = (j+'0'); but then it only iterates until 9 and give me strange characters again...

GameBoard_2

If I'm not wrong I think this has something to do with the ASCII code (please correct me if I'm wrong) but I've no clue how to fix this.

Could you explain me how can I solve this please.

Upvotes: 0

Views: 75

Answers (2)

001
001

Reputation: 13533

The issue is the char code for 10 + '0' = 58 which is the char code for ':'. You might consider removing the column and row names out of the game array. They are just labels and not part of the game (I assume).

#define board_size 10

And 

// Create game board and initialize grid to '~', in main() possibly
// Game is 10x10 grid
char tabuleiro[board_size][board_size];
for (int row = 0; row < board_size; row++) {
    for (int col = 0; col < board_size; col++) {
        tabuleiro[row][col] = '~';
    }
}

Have a function that draws the game board:

void drawBoard(char tabuleiro[board_size][board_size]) {
    // Print top line
    printf("  ");
    for (int col = 0; col < board_size; col++) {
        printf(" %-2d", col+1);
    }
    printf("\n");

    // Print grid
    for (int row = 0; row < board_size; row++) {
        // Print letter
        printf("%c ", 'A' + row);
        // Print board
        for (int col = 0; col < board_size; col++) {
            printf(" %c ", tabuleiro[row][col]);
        }
        printf("\n");
    }
}

Upvotes: 3

pm100
pm100

Reputation: 50110

to have precise control of the character i suggest

tabuleiro[0][j] = "123456789T"[j];

This will pick the jth character from that string

BTW the reason you got ':' is becasue ':' is the next ascii character after '9' - see http://www.asciitable.com/

Upvotes: 4

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