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Arrays/arrays.md

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+# ARRAYS
+
+Method of clubbing multiple entities of similar type into a large group.
+-
+---
+
+## DECLARE ARRAY:
+---
+
+define the data type (like int) and specify the name of the array followed by square brackets[].
+
+```c
+int myNumbers[];{a,b,c}
+```
+---
+
+## INITIALIZING ARRAYS 
+---
+
+### ***Method 1: Initialize an array using an Initializer List***
+---
+
+>>An initializer list initializes elements of an array in the order of the list.
+
+```c
+int arr[5] = {1, 2, 3, 4, 5};
+
+int arr[5] = {1, 2, 3, 4, 5};
+```
+
+```c
+// Valid. Size of the array is taken as the number of elements
+// in the initializer list (5)
+int arr[5] = {1, 2, 3, 4, 5};
+
+#include <stdio.h>
+
+int main() {
+    // You must mention the size of the array, if you want more than one
+    // element initialized to 0
+    // Here, all 5 elements are set to 0!
+    int arr[5] = {0};
+    for (int i=0; i<5; i++) {
+        printf("%d\n", arr[i]);
+    }
+    return 0;
+}
+```
+
+Output
+
+0
+0
+0
+0
+0
+
+>>>If you’re using multi-dimensional arrays, you can still initialize them all in one block, since arrays are stored in a row-wise manner.
+
+```c
+#include <stdio.h>
+
+int main() {
+    int arr[3][3] = {1,2,3,4,5,6,7,8,9};
+    for (int i=0; i<3; i++)
+        for (int j=0; j<3; j++)
+            printf("%d\n", arr[i][j]);
+    return 0;
+}
+
+A similar method can also be used for other datatypes, like float, char, char*, etc.
+
+#include <stdio.h>
+
+int main() {
+    // Array of char* elements (C "strings")
+    char* arr[9] = { "Hello", [1 ... 7] = "JournalDev", "Hi" };
+    for (int i=0; i<9; i++)
+        printf("%s\n", arr[i]);
+    return 0;
+}
+```
+**Output**
+
+>Hello
+>JournalDev
+>
+>JournalDev
+>
+>JournalDev
+>
+>JournalDev
+>
+>JournalDev
+>
+>JournalDev
+>
+>JournalDev
+>
+>Hi
+
+---
+
+### ***Method 2: Initialize an array in C using a for loop***
+---
+
+We can also use the for loop to set the elements of an array.
+
+```c
+#include <stdio.h>
+
+int main() {
+    // Declare the array
+    int arr[5];
+    for (int i=0; i<5; i++)
+        arr[i] = i;
+
+    for (int i=0; i<5; i++)
+        printf("%d\n", arr[i]);
+
+    return 0;
+}
+```
+
+__Output__
+
+- 0
+- 1
+- 2
+- 3
+- 4
+
+---
+
+### ***Method 3: Using Designated Initializers (For gcc compiler only)***
+---
+
+If you’re using _gcc_ as your __C compiler__, you can use designated initializers, to set a specific range of the ~~array~~ to the same value.
+
+```c
+#include <stdio.h>
+
+int main() {
+    int arr[9] = { 0, [1 ... 7] = 10, 0 };
+    for (int i=0; i<9; i++)
+        printf("%d\n", arr[i]);
+    return 0;
+}
+```
+
+[For more info on Arrays click link:](https://www.tutorialspoint.com/cprogramming/c_arrays.htm "C Tutorials")
+
+[![Image]()]()