#include <stdio.h>
#include <stdlib.h>
//200624101101杨振平
//2008年11月4日21：43编写
//the algorithm of the force method
void main()
{
//the defination of printing menu function
int menu();
//the defination of Algorithm of double method
void dbAlgorithm();
//the defination of Algorithm of int method
void intAlgorithm();
//inputs variable to choose menu's item
int quit=0;
while(!quit)
switch(menu())
{
case 1: dbAlgorithm();break;
case 2: intAlgorithm();break;
default: quit=1;
}
}
//print menu
int menu()
{
printf("|----------------------------------------|/n");
printf("|Please choose a menu: |/n");
printf("| 1 :Algorithm of double method |/n");
printf("| 2 :Algorithm of int method |/n");
printf("|Other keys:exit... |/n");
printf("|----------------------------------------|/n");
int ch;
scanf("%d",&ch);
return ch;
}
//the implement of double method algorithm
void dbAlgorithm()
{
double a,b,c,d,temp;
for(a=0.01;a<7.11;a=a+0.01)
for(b=0.01;b<7.11;b=b+0.01)
{
if(7.11-a-b>0)
for(c=0.01;c<7.11;c=c+0.01)
{
d=7.11-a-b-c;
if(d>0)
{
temp=a*b*c*d;
if(temp>7.109999 && temp<7.110001)
{
printf("a=%f,/tb=%f,/tc=%f,/td=%f,/t/n",a,b,c,d);
return ;
}
}
}
}
}
//the implement of int method algorithm
void intAlgorithm()
{
int a,b,c,d,temp;
for(a=1;a<711;a++)
for(b=1;b<711;b++)
{
if(711-a-b>0)
for(c=1;c<711;c++)
{
d=711-a-b-c;
if(d>0)
{
temp=a*b*c*d;
if(temp==711000000)
{
printf("a=%f,/tb=%f,/tc=%f,/td=%f,/t/n",(float)a/100,(float)b/100,(float)c/100,(float)d/100);
return ;
}
}
}
}
}
