我有一個C++程序計算標記的平均值,方差,標準偏差和變異係數,但它只能從鍵盤讀取值。 正在尋求一種C++程序的幫助,它可以計算上述所有內容,但是可以從計算機中讀取數值(例如,從計算機讀取包含多列的文件和/或表格,並像計算足球聯賽表格一樣獨立計算所有列的所有數據)下面 是,我要進行修改,以滿足上述所有要求從C++的計算機讀取文件和/或表格
#include<iostream.h>
#include<cmath>
#define MAXSIZE 1000
#include<fstream>
using namespace std;
void sd(void);
void average(void);
void variance(void);
void coeff(void);
void all(void);
float x[MAXSIZE];
int i=0, n, choice, c=0;
float avrg=0,var,stdv,cv, sum1=0, sum=0;
main()
{
cout<<"Enter the numbers (press -200 when finished)\n";
int hasrun=0;
for(int i=0; i<MAXSIZE; i++) ///INTERCHANGE n WiTH c
{
if (hasrun == 0)
{
cin>>x[i];
if (x[i] == -200)
{
hasrun =1;
}
c++;
}
if(x[i]<0|x[i]>100)
{
break;
cout<<"\nthe entered value is invalid\n";
hasrun =1;
}
}
for(;;)
{
cout<<"\n\nEnter Your Choice\n"
"1.Calculate average\n"
"2.Calculate variance\n"
"3.Calculate standard deviation\n"
"4.Calculate the coefficient of variation\n"
"5.Display all\n"
"6.end\n\n";
cin >> choice;
int exit = 0;
switch (choice)
{
case 1:
average();
break;
case 2:
variance();
break;
case 3:
sd();
break;
case 4:
coeff();
break;
case 5:
all();
break;
case 6:
exit=1;
break;
default:
cout<<"invalid choice"<<endl;
}
if (exit==1){
break;}
}
}
/* Compute the sum of all elements */
void average(void)
{
sum = 0;
cout<<"\tMEAN OF STUDENTS MARKS:\n\t_____________________\n";
for(int j=0; j<(c-1); j++)
{
sum = sum + x[j];
}
avrg = sum /(float)(c-1);
cout<<"\t\t";
cout<<avrg;
cout<<"\n\n";
//system("PAUSE");
}
void variance()
{
sum1=0;
cout<<"\tVARIANCE OF THE STUDENTS MARKS:\n\t_______________________________\n";
for(i=0; i<(c-1); i++)
{
sum1 = sum1 + pow((x[i] - avrg),2);
}
var = (sum1 /(float)(c-1));
cout<<"\t\t\t";
cout<<var;
cout<<"\n\n";
}
void sd()
{
cout<<"\tSTANDARD DEVIATION OF THE STUDENTS MARKS:\n\t________________________________\n";
stdv=sqrt(var);
cout<<"\t\t\t";
cout<<stdv;
cout<<"\n\n";
}
void coeff()
{
cout<<"\tCOEFFICIENT OF VARIATION:\n\t__________________________\n";
cv=stdv/avrg;
cout<<"\t\t\t";
cout<<cv;
cout<<"\n\n";
}
void all()
{
cout<<"\tDISPLAY ALL:\n\t********************\n";
cout<<"average=";
cout<<avrg;
cout<<"\n\n";
cout<<"variance=";
cout<<var;`enter code here`
cout<<"\n\n";
cout<<"standard deviation=";
cout<<stdv;
cout<<"\n\n";
cout<<"coefficient of variation=";
cout<<cv;
cout<<"\n\n";
}
這是我自己的工作,我只是一個學生,誰愛嘗試新的東西我的計劃草案,我教過最上面的功能自己.HELP ..............
「#include」 - 你必須是一個真正的老學生... –
2013-07-17 22:43:41
例如,嘗試搜索堆棧溢出「[C++]讀取文件變量」 –