Stack around the variable 'Output' was corrupted

I have the following code which can compile, build and run, however, stack around the variable 'Output' was corrupted and the PrintTable function is unable to produce the output I want.Please refer to the output.gif where the last Input Signals are different from the 1st and 2nd set of Input Signals ??

Thank you.

insert

Code:

#include <stdio.h>

void InputSignal(int size, float *pInput);
void FilterProcess (int size, float *pInput, float *pOutput);
void PrintTable(int size, float *pInput, float *pOutput);

void main(void)
{
	int size;
	float Input[20], Output[20], *pInput, *pOutput;

	printf("Enter the total number of digital signals to be processed :");
	scanf("%d", &size);
	
	pInput=Input;
	pOutput=Output;
	InputSignal(size, &pInput);
	FilterProcess(size, &pInput, &pOutput);
	PrintTable(size, &pInput, &pOutput);

}

void InputSignal(int size, float *pInput)
{
    int i;
	
	printf("Enter the %d digital signals :", size);
	
	for (i=0;i<size; i++)
	{
		scanf("%f", (pInput+i));
		
	}
   
	printf("Signal No      Input Signals\n");
    printf("---------      -------------\n");
	
	for (i=0; i<size; i++)
		printf("%d%20.2f\n", i+1, pInput[i]);
}

void FilterProcess (int size, float *pInput, float *pOutput)
{
	int i;
	
	printf("Signal No      Input Signals     Output Signals\n");
	printf("---------      -------------     --------------\n");
		
	for (i=0; i<size; i++)
	{
		if (i==0) 
			pOutput[i]=pInput[i];	
		else {		
			if (i==size-1)
			{
				pOutput[i]=pInput[i];
				
			}
		   else pOutput[i]=(pInput[i-1] + pInput[i] + pInput[i+1])/3.0;
			
		}
	printf("%5d%18.2f%18.2f\n", i+1, *(pInput+i), *(pOutput+i));
	
	} 
}


void PrintTable(int size, float *pInput, float *pOutput)
{
   int i;

   printf("Signal No      Input Signals     Output Signals\n");
   printf("---------      -------------     --------------\n");
  
    
  for (i=0; i<size; i++){
	  printf("%5d%18.2f%18.2f\n", i+1, pInput[i], pOutput[i]);
   }
}

&pInput is float** while function expects float*

You should not ignore warnings that compiler gives you

what do you mean by float** ?

Thank you for your reply and it works.

Originally Posted by jacksb68

what do you mean by float** ?

float ** is shorthand for "a pointer to a pointer to a float".

@OP
Never use void main(void), instead int main(void).