帮我改一下这个C++程序

1：#include
#include

using namespace std;

int main(int argc, char *argv[])
{

int x,y,z,count=0;
for(x=0;x<=100;x++)
for(y=0;y<=100;y++)
{z=100-x-y;
if(x*5+y*3+z/3==100)
{cout<<"cout="<cout<<"x="<cout<<"y="<cout<<"z="<cout<}
}
system("PAUSE");
return EXIT_SUCCESS;
}

2：#include
#include
#include
using namespace std;

int main(int argc, char *argv[])
{

int n;
double rate;
double capital;
double deposit;
cout<<"Please enter rate,year,capital:"<
system("PAUSE");
return EXIT_SUCCESS;
}

3：#include
#include
#include
using namespace std;

int main(int argc, char *argv[])
{

int a,b,c,d,e,f;
cout<<"\nPlease enter an integer greater than three:\n";
cout<<"a=";
cin>>a;
c=(a/1000)*1000;
d=a-(a/10)*10;
b=a/10;
e=b-(b/10)*10;
b=b/10;
f=b-(b/10)*10;
c=c+e*100;
c=c+f*10;
c=c+d;
cout<<"Transformed figures are:"<
system("PAUSE");
return EXIT_SUCCESS;
}

4：#include
#include
using namespace std;

int main()
{
float salary,tax,rate;
cout<<"\nPlease input salary!\n";
cout<<"salary=";
cin>>salary;
if(salary<=850)
rate=0;
else if(salary<=1350)
rate=0.05;
else if(salary<=2850)
rate=0.1;
else if(salary<=5850)
rate=0.15;
else
rate=0.2;
tax=rate*(salary-850);
cout<<"tax="< system("pause");
}