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89 lines
2.2 KiB
89 lines
2.2 KiB
#include <stdlib.h>
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#include <stdio.h>
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void displayArray(int arr[], size_t size);
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void displayArrayPtr(int *arr, size_t size);
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void displayArray(int arr[], size_t size) {
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for (size_t i = 0; i < size; i++) {
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// both variants are possible
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printf("%d\n", arr[i]);
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//printf("%d\n", *(arr + i));
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}
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}
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void displayArrayPtr(int *arr, size_t size) {
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for (size_t i = 0; i < size; i++) {
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// both variants are possible
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printf("%d\n", *(arr + i));
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//printf("%d\n", arr[i]);
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}
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}
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int main(void) {
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int vector[5] = {1,2,3,4,5};
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int *pv;
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pv = vector;
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printf("length of vector: %zu\n", sizeof(vector)/sizeof(int));
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int matrix[2][3] = {{1,2,3},{4,5,6}};
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for (size_t index = 0; index < 2; index++) {
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printf("&matrix[%zu]: %p sizeof(matrix[%zu]): %zu\n",
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index, &matrix[index], index, sizeof(matrix[index]));
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}
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// pointer notation and arrays
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int value = 3;
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for (size_t index = 0; index < sizeof(vector)/sizeof(int); index++) {
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// all following operations are equivalent
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*pv++ *= value;
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//pv[index] *= value;
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//*(pv + index) *= value;
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//vector[index] *= value;
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}
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for (size_t index = 0; index < sizeof(vector)/sizeof(int); index++) {
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printf("vector[%zu]: %d\n", index, vector[index]);
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}
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// using malloc to create a one-dimensional array
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pv = (int*) malloc(5 * sizeof(int));
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for (size_t i = 0; i < 5; i++) {
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pv[i] = i + 1;
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}
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for (size_t i = 0; i < 5; ++i) {
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*(pv + i) = i + 1;
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}
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for(size_t index = 0; index < 5; index++) {
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printf("pv[%zu]: %d\n", index, pv[index]);
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}
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// passing array to function using array notation
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displayArray(vector, sizeof(vector)/sizeof(int));
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// passing array to function using pointer notation
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displayArrayPtr(vector, sizeof(vector)/sizeof(int));
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// using one-dimensional array of pointers
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{
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int *arr[5];
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for (size_t i = 0; i < 5; i++) {
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// both variants are equivalent
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arr[i] = (int*) malloc(sizeof(int));
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*arr[i] = i;
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//*(arr + i) = (int*) malloc(sizeof(int));
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//**(arr + i) = i;
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}
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}
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return 0;
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}
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