计算汽车省油，用英里每加仑比较，允许重复比较
//mile for gallon 汽车省油
#include<iostream>const double GALLON = 0.264179; double milepergallon(double kilo,double mile);int main()
{using namespace std;double kilo[2],mile[2],milebygallon[2];char ans;do{cout<<"Enter the kilo and the mile of number first:\n";cin>>kilo[0]>>mile[0];cout<<"Enter the kilo and the mile of number second:\n";cin>>kilo[1]>>mile[1];milebygallon[0] = milepergallon(kilo[0],mile[0]);milebygallon[1] = milepergallon(kilo[1],mile[1]);cout<<"The first result is "<<milebygallon[0]<<" mile/gallon.\n";cout<<"The second result is "<<milebygallon[1]<<" mile/gallon.\n";if(milebygallon[0] > milebygallon[1])cout<<"The first car fuel saving!"<<endl;else if(milebygallon[0] < milebygallon[1])cout<<"The second car fuel saving!"<<endl;elsecout<<"The two cat are same saving oil!"<<endl;cout<<"Do you want again?";cin>>ans;}while('y' == ans || 'Y' ==ans);return 0;
}double milepergallon(double kilo,double mile)
{double gallon;gallon = kilo * GALLON;return (mile / gallon);
}结果：
Enter the kilo and the mile of number first:
1 0.264179
Enter the kilo and the mile of number second:
1 0.264179
The first result is 1 mile/gallon.
The second result is 1 mile/gallon.
The two cat are same saving oil!
Do you want again?y
Enter the kilo and the mile of number first:
1 1
Enter the kilo and the mile of number second:
10 2
The first result is 3.78531 mile/gallon.
The second result is 0.757062 mile/gallon.
The first car fuel saving!
Do you want again?y
Enter the kilo and the mile of number first:
1 1
Enter the kilo and the mile of number second:
2 2
The first result is 3.78531 mile/gallon.
The second result is 3.78531 mile/gallon.
The two cat are same saving oil!
Do you want again?转载于:https://blog.51cto.com/9320314/1546778
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