*** process returned -1 ***

[bilbo67216]

has anyone run across this error before? *** process returned -1 ***

I am writing this program for class and I am getting this error in the command screen but I have no compiler issues. It simply asks me to press a key and it exits the program. Can someone help me with this and let me know what I am doing wrong? Below is the code I have written so far.

[tabstop]

This line is an error:

printf("Power is %f watts.  Power is at Maximum level. \n");

as your compiler says, "too few arguments for format".

You are using R2 without it being initialized.

[bilbo67216]

Ok, got that line corrected. What do you mean by R2 not being initialized? My compiler isn't telling me too few arguments for format. it tells me

Building Maximum Power.
Writing debug information
Compacting CodeView information
Done.

[tabstop]

Ok, got that line corrected. What do you mean by R2 not being initialized?

When you first get to the line

while (R2 !=0)

R2 has the value p98yupoqiwhefp98ahsffgp;9uq3wp48y5q23;rj, since no real value has been stored in that variable.

[bilbo67216]

ok, so the statement R2 = 5000 is after the fact and needs to be before somewhere? What would you suggest?

[bilbo67216]

Does anyone have any suggestions here? I have tried changing up that while statement many ways and still get the "process returned -1" error. This is getting really frustrating.

[DeadPlanet]

When you first get to the line

while (R2 !=0)

R2 has the value p98yupoqiwhefp98ahsffgp;9uq3wp48y5q23;rj, since no real value has been stored in that variable.

Aren't all global variables initialised to 0 by the compiler?

(Note that if the code has been edited since you wrote that, then just ignore this).

In your current code, you have a while loop with the condition as "R2 != 0", this won't run at all (because of what I mentioned above, I'm fairly sure of it anyway).

Apply the changes suggested so far and re-upload the code (or just post it here in code tags, it's not terribly long).

Also, your indentation is pretty horrible. It will make the code easier to read for yourself and everyone with good indentation. You do have some indentation, it's just not consistent enough.

[bilbo67216]

#include <stdio.h>

#define R1 100

int R2;
int RL;
double V;
double VR2;
double VR1;
double VRL;
double PR2;
double PRL;
double I;

int
main (void){

int valid = 0;

while (valid == 0) { /*page 195*/
	printf("Enter Power Supply Voltage Setting on the Programmable Power Supply in 0.1 volt increments (1-15)>\n");
 	scanf("%3lf", &V);
	if (V > 15){
		printf("\n Invalid value.  The value must be 15 or less. \n");
		valid = 0;}
	else if (V < 1){
		printf("\n Invalid value.  The value must be one or greater. \n");
		valid = 0; }
	else 
		valid = 1;

}

int result = 0;

while (result == 0) {		
	printf("Enter Total Load Resistance in one ohm increments (100-5000)>\n");
	scanf("%d", &RL);
	if (RL > 5000 ){
		printf("\n Invalid value.  The value must be 5000 or less. \n");
		result = 0;}
	else if (RL < 100){
		printf("\n Invalid value.  The value must be 100 or greater. \n");  
		result = 0;}
	else
		result = 1;

}
int R2 = 5000;

while (R2 != 0){	
		R2 = 5000;
	
/*total current*/
I = V / (R2 + R1 + RL);
printf("Total current is %f amps. \n", I);

/*Voltage drop across R2*/
VR2 = (I * R2);
printf("Voltage of R2 is %f VDC. \n", VR2);

/*Voltage drop across R1*/
VR1 = (I * R1);
printf("voltage of R1 is %f VDC. \n", VR1);

/*Voltage drop across load*/
VRL = (I * RL);
printf("Voltage of load is %f VDC. \n", VRL);

/*Power drop across R2*/
PR2 = I * VR2;
printf("Power across R2 is %f watts.  \n", PR2);

 /*Power drop across load*/
PRL = I * VRL;
		if (R2 != 0){
			printf("Power is %f watts.  \n", PRL);
			R2 = R2 - 1;}
		else
			printf("Power is %f watts.  Power is at Maximum level. \n", PRL);
}
return(0);}

I guess I am not understanding what changes need to be made. I need the loop to execute until R2 = 0. At that point I want the loop to end and the final statement of max power stated. Sorry, but three months ago I didn't even know what C programming was. You stated to make the changes stated but I guess I am not seeing what changes need to be made. I can be pretty dense sometimes while the obvious is biting my leg.

[bilbo67216]

int R2 = 5000;

while (R2 > 0){

here is a change I made that still results in that error. It seems everything I do won't fix it.

[DeadPlanet]

First thing's first:

#include <stdio.h>

#define R1 100

int R2;
int RL;
double V;
double VR2;
double VR1;
double VRL;
double PR2;
double PRL;
double I;

int main (void)
{
        int valid = 0;

        while (valid == 0)  /*page 195*/
        {
	        printf("Enter Power Supply Voltage Setting on the Programmable Power Supply in 0.1 volt increments (1-15)>\n");
 	        scanf("%3lf", &V);
	        if (V > 15)
                {
		        printf("\n Invalid value.  The value must be 15 or less. \n");
		        valid = 0;
                }
	        else if (V < 1)
                {
		        printf("\n Invalid value.  The value must be one or greater. \n");
		        valid = 0;
                }
	        else 
		        valid = 1;
        }

        int result = 0;

        while (result == 0) 
        {		
	        printf("Enter Total Load Resistance in one ohm increments (100-5000)>\n");
	        scanf("%d", &RL);
	        if (RL > 5000 )
                {
		        printf("\n Invalid value.  The value must be 5000 or less. \n");
		        result = 0;
                }
	        else if (RL < 100)
                {
		        printf("\n Invalid value.  The value must be 100 or greater. \n");  
		        result = 0;
                }
	        else
		        result = 1;
        }

        int R2 = 5000;

        while (R2 != 0)
        {	
                R2 = 5000;
	
                /*total current*/
                I = V / (R2 + R1 + RL);
                printf("Total current is %f amps. \n", I);

                /*Voltage drop across R2*/
                VR2 = (I * R2);
                printf("Voltage of R2 is %f VDC. \n", VR2);

                /*Voltage drop across R1*/
                VR1 = (I * R1);
                printf("voltage of R1 is %f VDC. \n", VR1);

                /*Voltage drop across load*/
                VRL = (I * RL);
                printf("Voltage of load is %f VDC. \n", VRL);

                /*Power drop across R2*/
                PR2 = I * VR2;
                printf("Power across R2 is %f watts.  \n", PR2);

                /*Power drop across load*/
                PRL = I * VRL;
		
                if (R2 != 0)
                {
		        printf("Power is %f watts.  \n", PRL);
		        R2 = R2 - 1;
                }
		else
		        printf("Power is %f watts.  Power is at Maximum level. \n", PRL);
        }
        return(0);
}

Indentation makes your code a hell of a lot easier to read. The curly braces don't need to be set out as I have (different people have different preferences) but you should always add levels of indentation for anything nested. Good text editors (notepad++ for windows does it) can do this automatically for you if you specify you're using C. IDEs will do it as well.

[DeadPlanet]

You're resetting R2 to 5000 every time you loop around, so it will never reach 0. You made the right change by initialising it before the loop (even though you redeclared it, it will still work) but it seems you forgot to take it out of the loop when you did.

[bilbo67216]

Ok, I have taken out the repetitive R2 = 5000 inside the loop. I have a statement R2 = R2 - 1 that should decrement R2 by one. Do you think it isn't reading that?

[DeadPlanet]

What is it printing, what is it getting up to?

It will never print the final printf("Power is %f watts. Power is at Maximum level. \n", PRL); message because R2 can never be 0 when you get to that point (it should have exited at the beginning). Other than that first glance suggests that it would be working fine.

[bilbo67216]

I am still getting the error "process returned -1" I can't really see what it is doing beyond that as that is the only thing that appears along with press any key to continue.

[DeadPlanet]

Compiling with MinGW (through Code::Blocks) the code works exactly as I specified in my last post. It works perfectly except that it doesn't print the final Power measurement.

The process is returning 0.

Try to paste the code just above into your IDE/editor and compile it as a completely new file.