C Program to Left Rotate Array Items

Write a C program to left rotate array items for a given number of times using a for loop. This C example allows the user to enter the number of times the array has to left rotate, size, and elements.

#include<stdio.h>

void PrintArray(int a[], int Size) 
{		
 	for(int i = 0; i < Size; i++)  	
    {
        printf("%d  ", a[i]);
    }
} 

int main()
{
    int Size, i, j, num, temp;

    printf("Please Enter the Size of an Array = ");
    scanf("%d", &Size);

    int a[Size];

    printf("Please Enter the Array Elements = ");
    for(i = 0; i < Size; i++) 
    {
        scanf("%d", &a[i]);
    }
    
    printf("\nNumber of Times to Left Rotate an Array = ");
    scanf("%d", &num);

    for(i = 0; i < num; i++) 
    {
        temp = a[0];
        for(j = 0; j < Size - 1; j++)
        {
            a[j] = a[j + 1];
        }
        a[Size - 1] = temp;
    }
    
    printf("\nArray Elements After Left Rotating Array  :  ");
    PrintArray(a, Size);
    return 0;
}

C Program to Left Rotate Array Items using a while loop

#include<stdio.h>

void PrintArray(int a[], int Size) 
{	
    int i = 0;	
 	while(i < Size)  	
    {
        printf("%d \t ", a[i]);
        i++;
    }
} 

int main()
{
    int Size, i, j, num, temp;

    printf("\n Please Enter the Size = ");
    scanf("%d", &Size);

    int a[Size];

    printf("\n Please Enter the Elements = ");
    i = 0;
    while(i < Size) {
        scanf("%d", &a[i]);
        i++;
    }
    
    printf("\n Number of Times to Left Rotate an Array = ");
    scanf("%d", &num);
    
    i = 0;
    while(i < num) 
    {
        temp = a[0];
        j = 0; 
        while(j < Size - 1)
        {
            a[j] = a[j + 1];
            j++;
        }
        a[Size - 1] = temp;
        i++;
    }
    
    printf("\n Elements After Left Rotating Array  :  ");
    PrintArray(a, Size);
    return 0;
}

 Please Enter the Size = 8

 Please Enter the Elements = 22 33 44 55 66 77 88 99

 Number of Times to Left Rotate an Array = 6

 Elements After Left Rotating Array  :  88    99      22    33       44      55      66      77

This C program rotates array items to the left hand side for the user given times using functions.

#include<stdio.h>

void PrintArray(int *a, int Size) 
{		
 	for(int i = 0; i < Size; i++)  	
    {
        printf("%d  ", *(a + i));
    }
    printf("\n");
} 

void leftRotateArray(int a[], int size, int num)
{
    for(int i = 0; i < num; i++) 
    {
        int temp = a[0];
        for(int j = 0; j < size - 1; j++)
        {
            a[j] = a[j + 1];
        }
        a[size - 1] = temp;
    }
}

int main()
{
    int size, num;

    printf("\nPlease Enter the Size = ");
    scanf("%d", &size);

    int a[size];
    printf("\nPlease Enter the Elements = ");
    for(int i = 0; i < size; i++) {
        scanf("%d", &a[i]);
    }
    
    printf("\nNumber of Times to Left Rotate an Array = ");
    scanf("%d", &num);

    leftRotateArray(a, size, num);
    
    printf("\nElements After Left Rotating Array =  ");
    PrintArray(a, size);
}

Please Enter the Size = 10

Please Enter the Elements = 10 20 30 40 50 60 70 80 90 100

Number of Times to Left Rotate an Array = 4

Elements After Left Rotating Array =  50  60  70  80  90  100  10  20  30  40