Tag Archives: C&C++

Sometimes I am still a little bit confused by the relationship between a pointer and a multiple dimensional array. Let’s see some sample code: #include <stdio.h> // void printArr( int *arr, int row, int col ){    int i, j;    for( … Continue reading →

Here is a sample code, runs well in GCC, but not in visual studio 2008. #include <stdio.h>using namespace std;int main( void ){    printf( “%s\n”, “hello” );} but in visual studio 2008, I got   in order to make the namespace … Continue reading →

When you create header file in Code::Block, you would always see something like this : #ifndef LEFTROTATION_H_INCLUDED#define LEFTROTATION_H_INCLUDED .. #endif why these header guard should be there? Suppose you have a header file named a.h,  then in multiple file, let’s … Continue reading →

I always will meet some ‘segment fault’ or ‘memory is not accessible’ error when I uses pointers. some memory issue is impercitable. I have a  C function like this : void swap5(char** p, char** t) { char temp = **t; … Continue reading →

I met a c constant pointer and it take me sometime to figure it out.  Here is the code: char *leftRotation2(char *arr, int N, int K) { while(K–) { int j = arr[N-1]; for(int i=N-1;i>0;i–) { arr[i] = arr[i-1]; } … Continue reading →

When I read some C code about tree, C double pointer attract my attention. void insert(node ** tree1, node * item) { 12         if(!(*tree)) { 13                 *tree = item; 14                 return; 15         } 16         if(item->val<(*tree)->val) 17                 insert(&(*tree)->left, item); 18         else … Continue reading →