c - 是什么导致了这种奇怪的输出？

Question

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已关闭 11 年前。

我有以下代码:

void doPlayerMove(void)
{
    bool moved = false;

    while (!moved) 
    {
        printf("\nWhere is the piece you want to move?(rc):");
        int r = getchar() - '0';// gets the row number
        int c = getchar() - '0';// gets the column number

        printf("%d:%d", r, c);// prints the chosen row/column

        clearInput();
        printf("\nWhere is the space you want to move to?(rc):");
        int r2 = getchar() - '0';
        int c2 = getchar() - '0';

        printf("%d:%d", r2, c2);

        ...
    }
}

void clearInput(void)
{
    while(getchar() != '\n');
}

这是我得到的输出:

Where is the piece you want to move?(rc):51
5:1
Where is the space you want to move to?(rc):40
4:00

多出来的0是怎么回事？有人看出问题出在哪里吗？

Answer 1

正如OP在评论中所说:

Problem solved, it was some output from some function i was calling in the ... sorry for the false alarm!