Вложенные циклы

#include <iostream.h>
#include<conio.h>
#include<math.h>
void main() {
float x,a,f;
for (a=1; a<=5; a++){
for (x=0,2; x<=1; x+0,1);
f=a*x/cos(x)+4;
}
cout<<"f= "<<f;
getch();
}

for (a=1; a<=5; a++)
{
    for (x=0,2; x<=1; x+0,1);
        f=a*x/cos(x)+4;
    cout << f << endl;
}

double f;
 
for (double a = 1; a <= 5; a++)
{
    for (double x = 0.2; x <= 1; x + 0.1);
        f = a * x / cos(x) + 4;
    cout << f << endl;
}

a += 1;

double f;
 
for (double a = 1; a <= 5; a+=1)
{
    for (double x = 0.2; x <= 1; x += 0.1); f = a * x / cos(x) + 4;
    cout << f << endl;
}

double f;
 
    for (double a = 1; a <= 5; a += 1)
    {
        for (double x = 0.2; x <= 1; x + 0.1);
            f = a * x / cos(x) + 4;
        cout << f << endl;
    }

#include <iostream.h>
#include<conio.h>
#include<math.h>
void main() {
float x,a,f ;
for (a = 1; a <= 5; a+= 1)
{
for (x = 0.2; x <= 1; x+=0.1);
f=a*x/cos(x) + 4;
cout<<f<<endl;
}
getch();
}

cout<< setprecision(6) << f <<endl;