#include<stdio.h>
#define FALSE 0
#define TURE 1
longBinaryInput();
int isInputError( int binary);
long Binarytodecimal( int binary);
int main(void)
{
    long binary,decimal;
    while(1)
    {
        binary=BinaryInput();
        if(isInputError(binary)==FALSE)
        continue;
        else
        {
            decimal=Binarytodecimal(binary);
            break;
        }
    }
    printf("二进制数%d对应的十进制数是:%d\n",binary,decimal);
    return 0;
}
long BinaryInput()
{
    int a;
    printf("请输入一个二进制数：");
    scanf("%d",&a);
    return a;
}
 int isInputError( int binary)
 {
    int b,t=1;
    while (binary>0)
    {
        b=binary%10*t;
        binary=binary/10;
        t=t*2
    }
    if(binary)
    return 0;
    else
    return 1;
 }
long Binarytodecimal( int binary)

{
    int sum=0,p=1;
    while (binary)
    {
      int b;
      b=binary%10;
      sum=sum+b*p;
      p=p*2;
      binary=binary/10;
      return sum;
    }
}

int Binarytodecimal( int binary)
{
    int sum=0,p=1;
    while (binary>0)
    {
      int b;
      b=binary%10;
      sum=sum+b*p;
      p=p*2;
      binary=binary/10;
    }
    return sum;
}

还是不对啊，1010转换时是0

对了，看错了

对了，看错了

试试这一个
#include<stdio.h>
#include<math.h>
int BinaryInput();
int isInputError(int binary);
int fun(int binary,int k);
int main(void)
{
     int binary,decimal,k;
     binary=BinaryInput();
     k=isInputError(binary);
     decimal=fun(binary,k);
     printf("二进制数%d对应的十进制数是:%d\n",binary,decimal);
     return 0;
}
int BinaryInput()//输入一个十进制数表示二进制数
{
     int a;
     printf("请输入一个二进制数，最前一个数为1：");
     scanf("%d",&a);
     return a;
 }
 int isInputError(int binary)//统计二进制数的位数
 {
     int i=0;
     while (binary>0)
     {
         binary=binary/10;
         i++;
     }
     return i;
 }
 int fun(int binary,int k)//将二进制数转换为十进制数
 
{
    int i,j,sum=0;
    for(i=0;i<k;i++)
    {
        j=binary%10;
        binary=binary/10;
        sum+=pow(2,i)*j;
    }
    return sum;

}

试试这一个
#include<stdio.h>
#include<math.h>
int BinaryInput();
int isInputError(int binary);
int fun(int binary,int k);
int main(void)
{
     int binary,decimal,k;
     binary=BinaryInput();
     k=isInputError(binary);
     decimal=fun(binary,k);
     printf("二进制数%d对应的十进制数是:%d\n",binary,decimal);
     return 0;
}
int BinaryInput()//输入一个十进制数表示二进制数
{
     int a;
     printf("请输入一个二进制数，最前一个数为1：");
     scanf("%d",&a);
     return a;
 }
 int isInputError(int binary)//统计二进制数的位数
 {
     int i=0;
     while (binary>0)
     {
         binary=binary/10;
         i++;
     }
     return i;
 }
 int fun(int binary,int k)//将二进制数转换为十进制数
 
{
    int i,j,sum=0;
    for(i=0;i<k;i++)
    {
        j=binary%10;
        binary=binary/10;
        sum+=pow(2,i)*j;
    }
    return sum;

}

谢谢

#include<stdio.h>

#define FALSE 0
#define TRUE 1

long BinaryInput();
int isInputError(unsigned int binary);
long Binarytodecimal(unsigned int binary);

int main(void)
{
    long binary,decimal;
    while(1)
    {
        binary=BinaryInput();
        if(isInputError(binary)==FALSE)
            continue;
        else
        {
            decimal=Binarytodecimal(binary);
            break;
        }
    }
    printf("二进制数%d对应的十进制数是:%d\n",binary,decimal);
    return 0;
}

long BinaryInput()
{
    int a;
    printf("请输入一个二进制数：");
    scanf("%d",&a);
    return a;
}

int isInputError(unsigned int binary)
{
    for (; binary; binary/=10)
        if ((binary%10) > 1)
            return FALSE;
    return TRUE;
}

long Binarytodecimal(unsigned int binary)
{
    int i, dec=0;
    for (i=0; binary; binary/=10, ++i)
        if ((binary%10) == 1)
            dec += 1<<i;
    return dec;
}