C++程序设计实验报告(七十九)---第十六周任务一

#include<fstream>

#include<iostream>

#include<iomanip>

using namespace std;

void salary(double a[],int num);

void bubble_sort(double a[], int num);

void output_array(double a[], int num);

int main()
{
double sal[500] ;

ifstream infile( "salary.txt", ios::in );

if(!infile)
{
cerr << "open error" << endl;

exit(1);
}

for(int i = 0; i < 500; ++i)
{
infile >> sal[i];
}

infile.close();

salary(sal, 500);
bubble_sort(sal, 500);   //用冒泡法按降序排序a中元素
output_array(sal, 500);   //输出排序后的数组
ofstream outfile("ordered_salsry.txt", ios::out);

if(!outfile)
{
cerr << "open error!" << endl;

exit ( 1 );
}

for(int i = 0; i < 500; i++ )
{
outfile << sal[i] << '\t' ;

if( (i+1) % 15 == 0 )
{
cout << endl ;
}

}

outfile.close() ;
system("pause");
return 0 ;
}
void salary( double a[], int num )
{
for(int i = 0; i < num; i++ )
{
a[i] = a[i] + 100.00;
}
}

void bubble_sort(double a[], int num )
{
double t;

for(int j = 0; j < num-1; j++)
{
for(int i = 0; i < num-1-j; i++)
{
if(a[i] < a[i+1])
{
t = a[i];
a[i] = a[i+1];
a[i+1] = t;
}
}
}
}

void output_array(double a[], int num)
{
for(int i = 0; i < num; i++ )
{
cout << a[i] << "  " ;

if( (i+1) % 15 == 0 )
{
cout << endl ;
}
}
}