values from an array aren't passing onto a function

Projects Programming
1

i'm having problems with my S() function. it takes values from the array segment[] but it doesn't want to take values from theta[].

int theta[3];
int Stheta[5];
int segment[3];

int j;

void setup()
{

int h=2;
int m=15;
int s=0;

Serial.begin(9600);

theta[0] = 30h;
theta[1] = 6m;
theta[2] = 6*s;
Serial.println(theta[0]);
Serial.println(theta[1]);
Serial.println(theta[2]);

segment[0] = fsegment(theta, j=0);
segment[1] = fsegment(theta, j=1);
segment[2] = fsegment(theta, j=2);

Serial.println(segment[0]);
Serial.println(segment[1]);
Serial.println(segment[2]);

S(theta, segment, Stheta);

Serial.println(Stheta[0]);
Serial.println(Stheta[1]);
Serial.println(Stheta[2]);

}

void loop()
{
}

int fsegment(int theta[], int j)
{
int s=0;
do{
theta[j]=theta[j]/75;
s++;
}while(theta[j]>0);

return s-1;
}

void S(int theta[], int segment[], int Stheta[])
{
Stheta[0] = theta[0];
Stheta[1] = theta[1];
Stheta[2] = theta[2];
}

inside setup i printed various values to console to see where things were going wrong.
and inside function S() i set Stheta[j] = theta[j] ; so then in the console, the Stheta[] values should be the same as the theta[] values. but they're not. i have no idea why.

console:

60
90
0
0
1
0
0
0
0

arduino IDE v1.0.6

2

S is working fine - you're missing the fact that fsegment() side-effects its argument array.
Arrays are passed by reference, not by value (ie they are not copied).

3

To see what's going on, add this code fragment:

Serial.println("The new thetas");
     Serial.println(theta[0]);
     Serial.println(theta[1]);
     Serial.println(theta[2]);

just before you call S().

4

fixed it; thanks a bunch

int fsegment(int theta[], int j)                
{
  int b[3];
  int s=0;
  b[j] = theta[j];
  do{
    b[j]=b[j]/75;
    s++;
  }while(b[j]>0);
  
  return s-1;
}