Need Visual C++ functions to implement Digital Image Processing

#include<iostream.h>
#include<stdlib.h>
#include <fstream.h>
#include<math.h>

 void main()

    {

     unsigned char buffer;  
	 int width=0,height=0,i=0,y=0,s=0,temp;
     char inputFile[]="test2.bmp";			//This is the input image
	 char ouputFile[]="C:\\outdata.bmp";	//This is the output image 
	 float j=1.75,s1=0,temp1=0;
	 double gamma;
		

	 ifstream input(inputFile,ios::in|ios::binary);   
	ofstream output(ouputFile,ios::out|ios::binary);

	cout<<"Gamma Correction Example"<<endl;	
	cout<<"Type value for gamma = "<<endl;

	cin>>gamma;


     if (!input)                        

       cout << "Error in file name"<<endl;    

     else

       {                                
		 		
         cout << "File: " << inputFile << endl;
		 //Calculate Image width
		 for(i=0;i<=3;i++)
		 {
	
			input.seekg(18+i,ios::beg);
			input.get(buffer);
			width += (buffer<<8*i);
		
		 }
		 //Calculate Image height
		 for(i=0;i<=3;i++)
		 {
			input.seekg(22+i,ios::beg);
			input.get(buffer);
			height += (buffer<<8*i);
		
		 }
	
	
		

		 cout<<"Width of image in pixels = "<<width<<endl; 
		 cout<<"Height of image in pixels = "<<height<<endl; 

	if (gamma < 1)
	{
		while(y <= 254)
		{
				y = pow(255,gamma)*j;
				j = j + 0.01;
				
		}

	}

		//Copy same header and color table for the output image
		for(i=0;i<=(54+1024+width*height-1);i++)
		{
			input.seekg(i,ios::beg);
			input.get(buffer);//Here we read input data from input image

			if (i > 1077)
			{
			////////////////////////////////////////////////////
			//HERE YOU WRITE THE CODE FOR PROCESSING INPUT DATA
			///////////////////////////////////////////////////
				if (gamma >= 1)
				{
					temp = buffer;
					s = pow(temp,gamma)/pow(255,(gamma-1));
					buffer = s;
					output.put(buffer);
					//cout<<s<<endl;
				}
				else
				{

					
					temp1 = buffer;
					s1 = pow(temp1,gamma)*j;
					buffer = s1;
					output.put(buffer);//Here you copy data to the output image
					//cout<<s1<<endl;
				}
			////////////////////////////////////////////////////
			//HERE ENDS IMAGE PROCESSING CODE
			///////////////////////////////////////////////////

			}
			else
			output.put(buffer);//Here you copy data to the output image
			
		
		}

			
     }  
}