求教各位大哥!

[Tcs_win]

求教各位大哥,我想做数字进制转换,为什么变量J 没输入就出错了!

**********************
#include "stdafx.h"
#include "iostream"
#include "math.h"
using namespace std;
double _fun(char *p,double x);
int main()
{

double b;
char str[100];
double j;
printf("please input str!\n");
gets(str);
printf("please input j\n");
scanf("%lf",j);
b=_fun(str ,j);
printf("%f",b);
return 0;
}
double _fun(char *p,double x)
{
double newdata=0;
int len;
len = strlen(p);
p = p+len-1;
for(int i=0;i<len ;i++)
{
newdata+=((*p)-'0')*pow(x,i);
p--;

}

return newdata;
}

[帅得不敢出门]

#include "stdafx.h" 
#include "iostream" 
#include "math.h" 
using namespace std; 

double _fun(char *p,double x); 
int main() 
{ 
    
double b; 
char str[100]; 
double j; 
printf("please input str!\n"); 
gets(str); 
printf("please input j\n"); 
scanf("%lf",&j); //这里
printf("j==%lf\n",j);
b=_fun(str ,j); 
printf("%f",b); 
return 0; 
} 
double _fun(char *p,double x) 
{ 
double newdata=0; 
int len; 
len = strlen(p); 
p = p+len-1; 
for(int i=0;i <len ;i++) 
{ 
newdata+=((*p)-'0')*pow(x,i); 
p--; 

} 

return newdata; 
}

[太乙]

wo jiefen laile

[toadzw]

#include "iostream"
#include "math.h"
using namespace std;

double _fun(char *p,double x);
int main()
{

double b;
char str[100];
double j;
printf("please input str!\n");
gets(str);
printf("please input j\n");
scanf("%lf",&j); //这里
printf("j==%lf\n",j);
b=_fun(str ,j);
printf("%f",b);
return 0;
}
double _fun(char *p,double x)
{
double newdata=0;
int len;
len = strlen(p);
p = p+len-1;
for(int i=0;i <len ;i++)
{
newdata+=((*p)-'0')*pow(x,i);
p--;

}

return newdata;
}

right.............

[Tcs_win]

我太伤心了!!
我总是那么的不小心!
谢谢各位大哥!!