How to move object towards an angle in degrees? (C, C++) - c++

Question

I'm trying to move a bullet object towards a player position. I found this angle function online, and it seems to convert it to those coordinates in the comments. But i can't make the bullet follow in the direction.
float Angle(int p1x, int p1y, int p2x,int p2y)
{
//Make point1 the origin, make point2 relative to the origin so we do point1 - point1, and point2-point1,
//since we dont need point1 for the equation to work, the equation works correctly with the origin 0,0.
int deltaY = p2y - p1y;
int deltaX = p2x - p1x; //Vector 2 is now relative to origin, the angle is the same, we have just transformed it to use the origin.
float angleInDegrees = atan2(deltaY, deltaX) * 180 / PI;
//float angleInRadians = atan2(deltaY, deltaX);
angleInDegrees *= -1; // Y axis is inverted in computer windows, Y goes down, so invert the angle.
//Angle returned as:
// 90
// 135 45
//
// 180 Origin 0
//
// -135 -45
//
// -90
return angleInDegrees;
}
if (bulletsData[3] == STDEACTIVE){ //bulletData: 0 = x, 1 = y, 2 = dir, 3 = state
bulletsData[2] = Angle(bulletsData[0],bulletsData[1], plData[0], plData[1]);
bulletsData[3] = STACTIVE;
}
if (bulletsData[3] == STACTIVE){
if (ardu.everyXFrames(1)){
bulletsData[0] += cos(bulletsData[2]) * 1; //My attempt to move it towards the direction.
bulletsData[1] += sin(bulletsData[2]) * 1;
}
}

Answer 1

You are explicitly calculating angles in degrees, yet sin and cos expect radians, not degrees.
Without analyzing whether or not the Angle function is correct, your code will make more sense if you change the function to return a value in radians. You even have the required line there commented out.
So, something like this perhaps:
float angleInRadians = atan2(deltaY, deltaX);
return -angleInRadians; // Return negative angle to compensate for Y-down