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...int a[][3] = {1,2,3,4,5,6}; int (*ptr)[3] = a;
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2 3 3 4 but the output is: 2 3 5 6 I am expecting the output as 2 3 3 4 because initially the ptr is pointing to the first row of double dimensional array a[][3]. Therefore (*ptr)[1] of first printf will give us 2, like wise (*ptr)[2] will give us 3. But after the ++ptr line it will start pointing to the second element of the first row of a[][3].
Output: 15 Description: ptr = &a; copies the address of a in ptr making *ptr = a and the statement *ptr = *ptr * 3; can be written as a = a * 3; making a as 15. Question 2 What will be the output?
#include int main () { int a [] [3] = {1, 2, 3, 4, 5, 6}; int (*ptr) [3] = a; printf ("%d %d ", ... (b) 2 3 4 5 (c) 4 5 0 0 (d) none of the above
To start solving the first problem, given the declaration int a[][3] = {1, 2, 3, 4, 5, 6};, understand how the elements are arranged in the 2-dimensional array based on the provided initialization values.
接着 *（ptr-1） 显示的是5 ，数组和指针的没弄明白。 在书上给 出了这样一个解释，提到&（a+1）指的是下一个数组的首地址，并且已经越过了数组的界限，还是有些似懂非懂的感觉，希望后面能够彻底顿悟数组与指针的内容。
find the output int (*ptr) [3] = a; // here ptr is pointer to an array of 3 integers. At first ptr is pointing to first row. Say address of 1st row is 2000 Now ++ptr is updating pointer to next row. So, Now ptr pointing to address 2000+3*4=2012 @srestha,here if i want to point to address of 2..then what should i write??
Here, p is pointer to 0th element of the array arr, while ptr is a pointer that points to the whole array arr. The base type of p is int while base type of ptr is 'an array of 5 integers'.
For the binarySearch method in Section 6.7.2, what is low and high after the first iteration of the while loop when invoking binarySearch (new int [] {1, 4, 6, 8, 10, 15, 20}, 11)?
Concept: a = address of 0 th index of 2D array i.e address of 1D array {1,2,3,4,5}. *a = address of 0 th index element of 0 th index of above array i.e address of first element of array (1) **a = value of 0 th index element of 0 th index of array above i.e 1.
arr array contains five numbers from 0 to 4. p is an array of pointers to integers and it is filled with "addresses" of the numbers stored in arr. ptr is a pointer to a pointer to integer and it is initialized with p (because in C language an array of pointers is equivalent to a pointer to a pointer).