每行读取int并显示百分比

Reading int per line and displaying percentage

本文关键字：显示 百分比 int 读取      更新时间：2023-10-16

所以，我目前正在尝试编写一个程序，它读取一个名为"input.txt"的文件，其中存储的整数如下，并计算它们中大于零，小于零和等于零的百分比。

10
-4
0
34
42
-2
0

这是我的代码:

ifstream inputFile;
int count = 0;
int value,negative,positive,zero;
double negPerc,posPerc,zeroPerc;
inputFile.open("input.txt");
if ( !inputFile.fail()){
    while (inputFile >> value)
          {
            count++;
            if(value < 0)
                negative++;
            if(value == 0)
                zero++;
            if(value > 0)
                positive++;
          }
        }
else
 {
    cout << "nError, unable to open input file ";
 }
cout << fixed << setprecision(1);
negPerc = (negative/count)*100;
posPerc = (positive/count)*100;
zeroPerc = (zero/count)*100;

cout << "There were " << negPerc << "% negative numbers." << endl;
cout << "There were " << zeroPerc << "% numbers equal to zero." << endl;
cout << "There were " << posPerc << "% numbers greater than zero." << endl;

和文稿:

There were 1864443476.0% negative numbers.
There were 204178000.0% numbers equal to zero.
There were 0.0% numbers greater than zero.

我仔细检查了我的代码，并试图诊断为什么会这样，但我找不到任何问题。我做错了什么?

这是你的代码和每个人的评论放在一起供你学习。

// Compile with "g++ yourCPPfile.cpp -o yourExecName -g -Wall"
#include <iostream>
#include <iomanip>
#include <fstream>
using std::ifstream;
#include <cstdio>
using std::cout;
int main() {
    ifstream inputFile;
    int count, value, negative, positive, zero;
    count = negative = positive = zero = 0;
    double negPerc, posPerc, zeroPerc;
    inputFile.open("input.txt");
    if (!inputFile.fail()) {
        while (inputFile >> value) {
            count++;
            if (value < 0)
                negative++;
            if (value == 0)
                zero++;
            if (value > 0)
                positive++;
        }
    }
    else {
        cout << "nError, unable to open " << inputFile << "!n";
    }
    // Stays this way until you setPrecision() to something else.
    cout << std::setprecision(1);
    // Troubleshooting!!
    cout << negative << "n";
    cout << positive << "n";
    cout << zero << "n";
    cout << count << "n";
    // Calculations.
    negPerc = (negative * 100.0 / count);
    posPerc = (positive * 100.0 / count);
    zeroPerc = (zero * 100.0 / count);
    // Your desired result...
    cout << "There were " << std::fixed << negPerc << "% negative numbers." << "n";
    cout << "There were " << std::fixed << zeroPerc << "% numbers equal to zero." << "n";
    cout << "There were " << std::fixed << posPerc << "% numbers greater than zero." << "n";
    return 0;
}
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