c - Printf 在某些时候不起作用并且无法计算出公式

Question

这是我为学校做的一个项目。我有两个问题一直无法解决。它们出现在 admindistance 和 distancefunc 函数中。我不明白为什么距离没有被正确计算。这会导致功能无法完全发挥作用。秒问题是在 admindistance 函数中应该打印距离，但是这个 printf 语句似乎不起作用。感谢任何人能够提供的任何帮助。

#include <stdio.h>
#include <time.h>
#include <math.h>

int generatenum ( int num)
{
    return rand() % num + 1;
}

char admin ( int nrow, int ncolumn)
{
    char bypass;
    printf ( "Anything to tell me?\n");
    scanf ( " %c", &bypass);
    if ( bypass == 'A')
    {
        printf ( "Oh, your an administrator\n");
        printf ( "The random location is %i,%i\n", nrow, ncolumn);
        return bypass;
    }
    else
    {
    }
}

float admindistance ( int nrow, int ncolumn)
{
    float grow,gcolumn,distance,rowdifference,columndifference,rowpower,columnpower,oldistance;
    _Bool foundtarget=0;

    printf ( "What is your first guess?");
    scanf ( "%i%i", &grow, &gcolumn);
    rowdifference = nrow - grow;
    rowpower = pow ( rowdifference, 2.0);
    columndifference = ncolumn - gcolumn;
    columnpower = pow ( columndifference, 2.0);
    distance = sqrt ( rowdifference - columndifference);
    printf ( "Distance is %f\n", distance);
    while ( !foundtarget)
    {
        printf ( "What is your next guess?");
        scanf ( "%i%i", &grow, &gcolumn);
        if ( grow >= nrow)
        {
            printf ( "Error: Value entered is outside array size");
        }
        else if ( gcolumn >= ncolumn)
        {
            printf ( "Error: Value entered is outside array size");
        }
        else
        {
            /* CONTINUE */
        }
        rowdifference = nrow - grow;
        rowpower = pow ( rowdifference, 2.0);
        columndifference = ncolumn - gcolumn;
        columnpower = pow ( columndifference, 2.0);
        distance = sqrt ( rowdifference - columndifference);
        printf ( "Distance is %f\n", distance);
        if ( nrow == grow && ncolumn == gcolumn)
        {
            foundtarget = 1;
            printf ( "Congrats you win!");
        }
        else if ( nrow - grow <= 1 && ncolumn - gcolumn <= 1)
        {
            printf ( "YOU ARE ON FIRE!\n");
        }
        else if ( oldistance <= distance)
        {
            printf ( "You are getting colder\n");
        }
        else
        {
            printf ( "You are getting hotter\n");
        }
        oldistance = distance;
    }
    return 0;
}

float distancefunc ( int  nrow, int ncolumn)
{
    float grow,gcolumn,distance,rowdifference,columndifference,rowpower,columnpower,oldistance;
    _Bool foundtarget = 0;

    printf ( "What is your first guess?");
    scanf ( "%i%i", &grow, &gcolumn);
    while ( !foundtarget)
    {
        printf ( "What is your next guess?");
        scanf ( "%i%i", &grow, &gcolumn);
        if ( grow >= nrow)
        {
            printf ( "Error: Value entered is outside array size");
        }
        else if ( gcolumn >= ncolumn)
        {
            printf ( "Error: Value entered is outside array size");
        }
        else
        {
            /* CONTINUE */
        }
        rowdifference = nrow - grow;
        rowpower = pow ( rowdifference, 2.0);
        columndifference = ncolumn - gcolumn;
        columnpower = pow ( columndifference, 2.0);
        distance = sqrt ( rowdifference - columndifference);
        if ( nrow == grow && ncolumn == gcolumn)
        {
            foundtarget = 1;
            printf ( "Congrats you win!");
        }
        else if ( nrow - grow <= 1 && ncolumn - gcolumn <= 1)
        {
            printf ( "YOU ARE ON FIRE!");
        }
        else if ( oldistance <= distance)
        {
            printf ( "You are getting colder");
        }
        else
        {
            printf ( "You are getting hotter");
        }
        oldistance = distance;
    }
    return 0;
}

int main ( char bypass)
{
    int row, column,nrow,ncolumn,grow,gcolumn,admininput;

    printf ( "Welcome to the Hotter-Colder Game!\n\n");
    printf ( "How many rows and columns are in the grid?\n\n");
    scanf ( "%i%i", &row, &column);
    time_t seconds = time ( NULL);
    int seed = ( unsigned)( seconds);
    srand ( seed);
    int i = 0;
    nrow = generatenum ( row);
    ncolumn = generatenum ( column);
    admin ( nrow, ncolumn);
    if ( admininput == bypass)
    {
        admindistance ( nrow, ncolumn);
    }
    else
    {
        distancefunc ( nrow, ncolumn);
    }
    return 0;
}

Answer 1

您计算rowpower和columnpower，然后不使用它们。

rowdifference = nrow - grow;
rowpower = pow(rowdifference,2.0);
columndifference = ncolumn - gcolumn;
columnpower = pow(columndifference,2.0);
distance = sqrt(rowdifference - columndifference);

我认为最后一行应该是

distance = sqrt(rowpower + columnpower);

The seconds issue is that in the admindistance function it is supposed to print the distance, but this printf statement does not seem to work.

这里的 printf 语句本身没有任何问题，所以我假设它是由于相同的错误导致您的距离没有被打印。