A pointer in C is the address of something. It is a rare case indeed when we care what the specific address itself is, but pointers are a quite common way to get at the contents of something. The unary operator ‘&’ is used to produce the address of an object, if it has one. Thus
int a, b;
b = &a;
puts the address of a into b We can’t do much with it except print it or pass it to some other routine, because we haven’t given b the right kind of declaration. But if we declare that b is indeed a pointer to an integer, we’re in good shape:
int a, *b, c;
b = &a;
c = *b;
b contains ...
Tuesday, July 12, 2011
CREATE NEGATIVE FROM PNG IMAGE
HI,here we will discuss about how we can create a negative image from png image by using C program.The source code of C Program is given below.Just try it.
SOURCE CODE
/*CREATE NEGATIVE FROM PNG IMAGE*/
#include <stdio.h>
#include <error.h>
#include <gd.h>
int main(int argc, char *argv[]) {
FILE *fp = {0};
gdImagePtr img;
char *iname = NULL;
char *oname = NULL;
int color, x, y, w, h;
int red, green, blue;
color = x = y = w = h = 0;
red = green = blue = 0;
if(argc != 3)
error(1, 0, "Usage: gdnegat input.png output.png");
else ...
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