Edminas - 10 months ago 42

C++ Question

so, I got a code and I need to express my answers into 3 columns with x,y,a in program, by compiling I only get the calculation answers - 1 column with y value throughout the cycle [5] . How do I make it to a table with x, y, a columns and their values? Do I need another for cycle? Any suggestions are appreciated.

`#include < iostream>`

using namespace std;

float fy(float x, float a);

int main()

{

float a[5] = { -8, -6, -4, -2, 0 }

float y = 0;

int i = 0;

for (float x = -1; x <= 1; x += 0.5)

{

cout << fy(x, a[i]) << endl;

i++;

}

cin.get();

return 0;

}

float fy(float x, float a)

{

float y = 0;

if (sin(x)*a > 0)

y = sqrt(sin(x)*a);

else

cout << "no solution\n";

return y;

}

Answer Source

I guess what you want is something like this:

```
x y a
-1 2.59457 -8
-0.5 1.69604 -6
0 -nan -4
0.5 -nan -2
1 -nan 0
```

Right?

Following code should do the job:

```
#include <iostream>
#include <math.h>
using namespace std;
float fy(float x, float a);
int main() {
float a[5] = {-8, -6, -4, -2, 0};
float y = 0;
int i = 0;
cout << "x"
<< "\t"
<< "y"
<< "\t"
<< "a" << endl;
for (float x = -1; x <= 1; x += 0.5)
{
cout << x << "\t" << fy(x, a[i]) << "\t" << a[i] << endl;
i++;
}
cin.get();
return 0;
}
float fy(float x, float a) {
float y = 0;
if (sin(x) * a > 0)
y = sqrt(sin(x) * a);
else
y = sqrt(-1);
return y;
}
```

The problem in your code is that you only print the result of the function. So you neither print x nor you print the a[i] value. Check the replaced cout line and you'll see how to print the other values.