C语言高手帮帮忙！超急问题！

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#include "stdio.h"
#include "math.h"
#include "stdlib.h"

void binarytodecimal( char *b, int b_count )
{
int result = 0;

for ( int i = b_count; i >= 0; i-- )
if ( b[i] == '1' )
result = result + pow( 2.0, b_count - i );

printf("你输入的二进制数对应的十进制数为:%d\n",result);
}

void decimaltobinary( int d )
{
int d_count = 0;
char p[20];

while ( d > 0 )
{
p[d_count++] = d % 2 + 48;
d = ( d - d % 2 ) / 2;
}

for ( int i = d_count - 1; i >= 0; i-- )
printf("%c",p[i]);
printf("\n");
}

void main()
{
char c;
int count = 0; //计算输入二进制数的长度
char binary[20]; //定义字符数字存放二进制数，最长可输入20位二进制数
int decimal;

printf("二进制转十进制请按B，十进制转二进制请按D.\n");
scanf("%c&