C++は基本計算に2つの異なる答えを与えます

Question

これを実行すると、if文の外で正しい答えが得られ、if文の中で間違った答えが得られます。 EXと3は長さと幅が9です何か他のものは、後でので、O/Pラインを改ざん - 条件の内側にそれは私が

cout << "you entered 2 for Rectangle\n"; 
cout << "Enter the length of the Rectangle.\n"; 
cin >> lengthRec; 

cout << "Enter the width of the Rectangle.\n"; 
cin >> widthRec; 

areaRec = lengthRec * widthRec; 
cout << areaRec; 

if ((lengthRec > 0) && (widthRec > 0)) { 
    areaRec = lengthRec * widthRec; 
    cout << "\nlength is " << lengthRec << "\n"<< "width is " << 
    widthRec << "\n"; 
    cout << "The area is "; 
    cout << areaRec; 
} 
else { 
    cout << "Invalid entry, Please re run with a positive number\n"; 
} 

Answer 1

は罰金は問題ワークスない...すべてのヘルプは素晴らしいことだダブルフロートint型... を試してみました ...私に92を与えますドン;「\ n」

#include <iostream> 
#include <stdio.h> 
#include <iostream> 

using namespace std; 

int main(){ 
    int lengthRec, widthRec, areaRec; 
    cout << "you entered 2 for Rectangle\n"; 
    cout << "Enter the length of the Rectangle.\n"; 
    cin >> lengthRec; 

    cout << "Enter the width of the Rectangle.\n"; 
    cin >> widthRec; //CHECK HERE 

    areaRec = lengthRec * widthRec; 
    cout << areaRec<<"\n"; 

    if ((lengthRec > 0) && (widthRec > 0)) { 

     areaRec = lengthRec * widthRec; 
     cout << "\nlength is " << lengthRec << "\n"<< "width is " << 
     widthRec << "\n"; 
     cout << "The area is "; 
     cout << areaRec<<"\n"; //CHECK HERE 
    } 
    else { 
     cout << "Invalid entry, Please re run with a positive number\n"; 
    } 
    return 0; 
} 

出力： -

you entered 2 for Rectangle 
Enter the length of the Rectangle. 
Enter the width of the Rectangle. 
9 
length is 3 
width is 3 
The area is 9