This is in c++. I get the following errors: error: expression list treated as co

Question

This is in c++.

I get the following errors:

error: expression list treated as compound expression in functional cast (at   for(int i=0;i<75;i++)
for(int j=0;j<21;j++)

What does it mean and how do I fix it?

#include <iostream>
#include <iomanip>
#include <string>

using namespace std;

int main()
{
int a;
int b;
float t1, t2, m, p2, p1, w, p, j, i,t;

double pt [75][21] = { . . . }

cout << "input temperature"<< endl;
cin >> t;

cout << "input pressure"<< endl;
cin >> p;

for int(i=0, i<21, i++)
for int (j=0, j<75, j++)
{

if pt[75][21]>=p
{
if pt>=
}
}
p1=aray[j-1][i];
x2=aray[j][i];
break;
}
}
cout<<"p1"<<p1;
cout<<"p2"<p2;
for(int i=0;i<75;i++)
for(int j=0;j<21;j++)
{
if(aray[i][j]>=t)
{
t1=aray[i][j-1];
t2=aray[i][j];
break;
}
}
cout<<"t1"<<t1;
cout<<"t2"<<t2;
m=(t2-t1)/(p2-p1);
cout.precision(4);
cout<<"The slope is: "<<m<<" ";
cin.get();

w=t1-(m*p1);
cout<<"the y interceptis: "<<w<<" ";
cout<<"the line equation is: y=("<<m<<")*p + "<<b<<" ";
system("pause");
}
if (p = 10)

a=3

}

...

b= (12+t)/3.4;

cout << "the answer is" << pt[a][b]<< endl;

return 0;
}

Thanks very much for your time and help!

Explanation / Answer

First of all The code is very unclear, You should try again with neater code,

There are lot of mistakes in your code like

1)or int(i=0, i<21, i++)

for int (j=0, j<75, j++)

it should have been

for (int i=0, i<21, i++)
for (int j=0, j<75, j++)

The int should be within bracket of FOR loop because you are defining variable i,j

2)

The brackets {} used in your codes are inconsistent, they are not properly placed, I can see you have used

more number of closed brackets "}" than open brackets "{"

3)

I am unable to provide correct code for the above because the above code in incomplete for eg.

if pt[75][21]>=p
{
if pt>=
}

What is "if pt>=" ?, please provide full code for better understanding.

I think if you correcty use brackets for your code then error will be removed

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