我无法处理以下代码行:
double answer;
answer = num[count] / den[count]
cout << " Fraction" << count + 1 << " " << num[count]
<< " / " << den[count] << " = " << answer << endl;
为什么我的答案无法奏效?我在俯视什么吗?我正在使用数组,并且正在从单独的文本文件中获取数据。当我使用上面的代码时,我得到要正确除数的数字,但答案不正确。它是通常为0或1的随机数。
这是我的代码:
#include <iostream>
#include <fstream>
#include <iomanip>
#include <cstdlib>
using namespace std;
void read_data(int num[], int den[], int size);
void showValues(int num[],int den[], int size);
int main()
{
const int size1 = 12;
const int size2 = 12;
ifstream dataIn;
int num[12];
int den[12];
read_data(num,den,size1);
cout << "Here are the fractions: " << endl;
showValues(num,den,size1);
system("PAUSE");
return 0;
}
void read_data(int num[], int den[], int size)
{
ifstream dataIn;
dataIn.open("walrus.txt");
if( dataIn.fail() )
{
cout << "File does not exist." << endl;
exit(1);
}
int count;
for ( count = 0; count < size; count++ )
{
dataIn >> num[count];
}
for (count = 0; count < size; count++)
{
dataIn >> den[count];
}
dataIn.close();
}
void showValues(int num[],int den[], int size)
{
int count;
for (count = 0; count < size; count++)
{
if (den[count] == 0)
{
cout << " Fraction" << count + 1 << " "
<< num[count] << " /" << den[count]
<< " Is invalid" << endl;
}
else
{
double answer;
answer = num[count] / den[count];
cout << " Fraction" << count + 1 << " "
<< num[count] << " / " << den[count]
<< " = " << answer << endl;
}
}
}
@mainifstream dataIn;
您没有使用此对象
@function read_data:
int count;
for ( count = 0; count < size; count++ )
{
dataIn >> num[count];
}
for (count = 0; count < size; count++)
{
dataIn >> den[count];
}
假设您的文件看起来像:
1 2 23 32 44 // numerators
2 3 1 99 24 // den
正确的阅读方式是:
int count = 0;
while( count < size && dataIn >> num[count++] ) // numerators
;
count = 0;
while( count < size && dataIn >> den[count++] )
;
@function showValues:尝试更改
double answer;
answer = num[count] / den[count];
cout << " Fraction" << count + 1 << " "
<< num[count] << " / " << den[count]
<< " = " << answer << endl;
到 :
double answer = static_cast<double>(num[count]) / den[count];
cout << " Fraction" << count + 1 << " "
<< num[count] << " / " << den[count] << " = " << answer << endl;
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