c - C程序中的浮点异常

Question

我在以下代码中遇到浮点异常。

int heavy_decimal_count ( int A, int B )        
{        
 char * markup = "Heavy";    
 int i , value;   
 int tempA = A;   
 int tempB = B;    
 int reminder = 0;    
 int sum = 0;     
 float average = 0.00;     
 int counter = 0;    
 if( (tempA < 0) || ( tempB <0 )||( B < A ) )    
 {    
    printf(" Error -> Numbers are negative or B is less than A");     
    return 0;     
 }    
 for (  i = A ; i <= B ; i++)     
 {    
     value = i;     
     while( value > 0 )    
     {    
        printf(" the value is %d ", value );     
        counter += counter;     
        reminder = value % 10;      
        value /= 10;    
        sum += reminder;     
        average =  sum/counter ;     

    }     
    if( average > 7.0 )    
            printf(" %d \t  avg= %f\t %s\t" ,i , average , markup);   
        else     
            printf(" %d \t  avg=%f\t " ,i , average );     
}     
return 0;      
 }     

Answer 1

尽管有这个名字，当您 / 或 % 一个整数乘以 0 时，实际上会发生“浮点异常”。我的猜测是它发生在这里:

average =  sum/counter ;

因为计数器仍然是0。我想你的意思是

counter += counter;

成为

counter += 1;

此外，您可能希望将部门更改为

average =  (float)sum/counter ;

因此它可以作为小数值而不是整数出现。