add exercise21 and exercise22

add array execises

codeforwin_c_exercises/array_and_matrix_programming_exercises/exercise21/exercise21.c

@@ -0,0 +1,67 @@
+/*
+Write a C program to left rotate an array by n position. 
+How to rotate left rotate an array n times in C programming. 
+Logic to rotate an array to left by n position in C program.
+*/
+
+#include<stdio.h>
+#define SIZE 10
+
+void printArray(int arr[],int size);
+void rotateArray(int arr[]);
+
+int main(){
+
+    int arr[SIZE];
+    int rotation;
+
+
+    printf("Enter 10 elements in array:");
+    for (int i = 0; i < SIZE; i++)
+    {
+        scanf("%d",&arr[i]);
+    }
+
+    printf("Enter number of times to left rotate:");
+    scanf("%d",&rotation);
+
+    rotation = rotation % SIZE;
+
+    printf("Array before rotation\n");
+    printArray(arr,SIZE);
+
+    for (int i = 0; i < rotation; i++)
+    {
+        rotateArray(arr);
+    }
+
+    puts("");
+
+    printf("Array after rotation\n");
+    printArray(arr,SIZE);
+
+    return 0;
+}
+
+
+void rotateArray(int arr[]){
+    int temp;
+
+    temp = arr[0];
+
+    for (int i = 0; i < SIZE-1; i++)
+    {
+        arr[i] = arr[i+1];
+    }
+
+    arr[SIZE-1] = temp;
+}
+
+
+void printArray(int arr[],int size){
+    for (int i = 0; i < size; i++)
+    {
+        printf("%d ",arr[i]);
+    }
+
+}

codeforwin_c_exercises/array_and_matrix_programming_exercises/exercise22/exercise22.c

@@ -0,0 +1,67 @@
+/*
+Write a C program to right rotate an array by n position. 
+How to right rotate an array n times in C programming. 
+Logic to rotate an array to right by n position in C program.
+*/
+
+#include<stdio.h>
+#define SIZE 10
+
+void printArray(int arr[],int size);
+void rotateArray(int arr[]);
+
+int main(){
+
+    int arr[SIZE];
+    int rotation;
+
+
+    printf("Enter 10 elements in array:");
+    for (int i = 0; i < SIZE; i++)
+    {
+        scanf("%d",&arr[i]);
+    }
+
+    printf("Enter number of times to left rotate:");
+    scanf("%d",&rotation);
+
+    rotation = rotation % SIZE;
+
+    printf("Array before rotation\n");
+    printArray(arr,SIZE);
+
+    for (int i = 0; i < rotation; i++)
+    {
+        rotateArray(arr);
+    }
+
+    puts("");
+
+    printf("Array after rotation\n");
+    printArray(arr,SIZE);
+
+    return 0;
+}
+
+
+void rotateArray(int arr[]){
+    int temp;
+
+    temp = arr[SIZE-1];
+
+    for (int i = SIZE-1; i > 0; i--)
+    {
+        arr[i] = arr[i-1];
+    }
+
+    arr[0] = temp;
+}
+
+
+void printArray(int arr[],int size){
+    for (int i = 0; i < size; i++)
+    {
+        printf("%d ",arr[i]);
+    }
+
+}