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The formula used by pointer substraction is: ( q - p ) == ( addr( q ) - addr( p ) ) / sizeof( T ) with T being the type of both p and q. int array[10]; int* p1 = array + 2; int* p2 = array + 5; ptrdiff_t a = p2 - p1; // 3 ptrdiff_t b = p1 - p2; //...
A pointer is a variable declared to store a memory address. type * ptr-var-name; ptr-var-name can hold the address of a variable of type Important pointer-related operators: & : address-of *: dereference (not the same as the used for declarations!!!)...
Using pointer to an array itself as a loop variable
Program 1: #include <stdio.h> int main(void) { int a[] = {10, 20, 30, 40, 50}; int i, *p; p=a+4; for(i=4;i>=0;i--) printf("%d\n", *(p-i)); return 0; } Output: Changing the direction of the loop: Program 2: #include <stdio.h> int main(void)...
This program combines dereferencing, pre- / post- increment and assignment operations. Try figuring out the output yourself first before reading the output and explanation. Program: #include <stdio.h> int main() { int A[] = {10, 20, 30, 40, 50}; in...
#define MAX 10 int main() { int a[MAX]; int b[MAX]; int i; for(i=0; i<MAX; i++) a[i]=i; b=a; return 0; } b = a is not allowed.
