清霜一梦

while执行两次的问题,已经解决

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//2013 5 11

//designer :pengxiaoen

// function change the number 'd' to 'b'

#include "stdio.h"

unsigned long int in_un_number;

char in_c_choice; int s[33];

int i;

 

void output_function ()

{  

printf ("\nSUCCESS\n") ;  

printf ("%d = (%d)",in_un_number,i);  

for (i=i-1;i>=0;i--)    printf ("%d",s[i]);   printf ("\n\n\n");

}

 

void choice_function ()

{  

printf ("please choice next operation:\n");  

printf ("'c' for contiue\n");             

}

 

void transform_function(unsigned long int temp)

{  

i = 0;    

temp = in_un_number;    

while (temp != 0)    

{      

s[i] = temp % 2;      

temp = temp /2;      

i++;    

}         

}

 

 

int main ()

{            

in_c_choice = 'c';    

for (i=33;i>=0;i--) s[i] = 0;        

printf ("The function is change 'd' to 'b'\n");

 

//-------------------------------------------------------------  

while (in_c_choice == 'c')  

{   

printf ("Please enter your positive number : ");   

scanf("%d",&in_un_number);   

   transform_function(in_un_number);   

output_function();   

choice_function();       

scanf("%d",&in_c_choice);

 }   

system ("pause");

}  

 

 

第一次键入值正确

可是当我再键入 c 的时候就出现了死循环

不知道为什么?????????????????????????????????????????????????????????

修改:

将scanf("%d",&in_c_choice);和choice_functon注释掉,正常

 

 

 

问题解决办法:

因为第二次执行scanf的时候,读取内存数据,由于上一次的残留,程序以外其中有数,输入完毕

解决办法  在scanf之前 清除缓存数据

 fflush(stdin);