Function call a for loop - c

Question

I'm trying to function call the for loop and print AngleValue and SinValue, but whatever I do I can't get it to work. All I need is to print those 2 from the loop into the main function.
int trigof(int x, double y, double AngleValue, double SinValue);
int main(void)
{
printf("%35s","***************************\n");
printf("%35s","****TABLE OF SIN VALUES****\n");
printf("%35s","***************************\n");
printf("%17s", "ANGLE(DEG)");
printf("%18s","SIN(ANGLE)\n");
printf("Press any key to exit");
getchar();
return 0;
}//endprogram
int trigof(int x, double y, double AngleValue, double SinValue)
{
for (x = 0; x < 18; x++)
{
y = AngleValue * PI / 180;
SinValue = sin(y);
printf("%13.1f", AngleValue);
printf("%18.4f\n", SinValue);
AngleValue = AngleValue + 20.0;
}
return AngleValue;
return SinValue;
}

Answer 1

First of all there are lots of mistakes.
You have declared function but you haven't called it in your main. To call function inside main use this statement inside main function trigof(0,0,45,0); 45 is the angle value. Secondly you don't need x, y, signvalue as function parameters. You can declare them locally inside your trigof function. Lastly there should be only one return statement returning only one object.

Answer 2

#define PI (4*atan(1))
static void trigOf(void);
int main(void) {
printf("%35s","***************************\n");
printf("%35s","****TABLE OF SIN VALUES****\n");
printf("%35s","***************************\n");
printf("%17s", "ANGLE(DEG)");
printf("%18s","SIN(ANGLE)\n");
trigOf();
printf("Press any key to exit");
getchar();
return 0;
}//endprogram
static void trigof() {
int x;
double y=0.0,AngleValue=0.0,SinValue=0.0;
for (x = 0; x < 18; x++) {
y = AngleValue * PI / 180;
SinValue = sin(y);
printf("%13.1f", AngleValue);
printf("%18.4f\n", SinValue);
AngleValue = AngleValue + 20.0;
}
}

Answer 3

For starters...
You have to define global variables.
#define PI 3.14159265358979323846
Your function prototype is incorrect, it requires no parameters in this scenario.
//this is wrong
int trigof(int x, double y, double AngleValue, double SinValue);
//this is right
int trigof();
You never call the function trigof(); in main therefore you get no results.
printf("%35s","***************************\n");
printf("%35s","****TABLE OF SIN VALUES****\n");
printf("%35s","***************************\n");
printf("%17s", "ANGLE(DEG)");
printf("%18s","SIN(ANGLE)\n");
//you should have function call here
trigof();
You simply need to define your local variables in the function.
example:
int trigof()
{
//these are local variables
int x;
double y, AngleValue, SinValue;
for (x = 0; x < 18; x++)
{
y = AngleValue * PI / 180;
SinValue = sin(y);
printf("%13.1f", AngleValue);
printf("%18.4f\n", SinValue);
AngleValue = AngleValue + 20.0;
}
return AngleValue;
return SinValue;
}
If you want your output to resemble this:
***************************
****TABLE OF SIN VALUES****
***************************
ANGLE(DEG) SIN(ANGLE)
0.0 0.0000
20.0 0.3419
40.0 0.6425
60.0 0.8658
80.0 0.9847
100.0 0.9850
120.0 0.8666
140.0 0.6437
160.0 0.3434
180.0 0.0016
200.0 -0.3404
220.0 -0.6413
240.0 -0.8650
260.0 -0.9844
280.0 -0.9852
300.0 -0.8673
320.0 -0.6450
340.0 -0.3448