C program to print how many times a character occurs in an array

Below is a C program which allows a user to enter a maximum of 10 characters. The program prints the count of how many times a given character occurs in the array.

/*Program to print how many times a given character occurs in an array*/
#include<stdio.h>
#include<conio.h>
void main()
{
    char arr[10],ch,i,num,flag=0,count=0;
    printf("How many characters you want to enter:");
    scanf("%d",&num);
    if(num>10)
    {
        printf("Size cannot be greater than 10.Try again...!");
    }
    else
    {
        /*Reading the array elements*/
        printf("Enter the array elements:\n");
        for(i=0;i<num;i++)
        {
            fflush(stdin);
            scanf("%c",&arr[i]);
        }
        /*Reading the character to search in the array*/
        printf("Enter the character you want to search:");
        fflush(stdin);
        scanf("%c",&ch);
        /*Code to check if the character is available in the array or not*/
        for(i=0;i<num;i++)
        {
            if(arr[i]==ch)
            {
                flag = 1;
                count++;
            }
        }
        if(flag==0)
        printf("Given character is not available in the array.");
        else
        printf("Given character '%c' occurs %d times in the array",ch,count);
    }
    getch();
}


Sample input and output:

How many characters you want to enter:6
Enter the array elements:
a
b
c
a
d
a
Enter the character you want to search:a
Given character 'a' occurs 3 times in the array

C program to search for a given character in an array

Below is a C program which allows an user to enter a maximum of 10 characters . It also allows an user to search whether a given character is available in the array or not. If the given character is available, the program displays the index within the array at which the character is found.

/*Program to search for a given character in an array*/
#include<stdio.h>
#include<conio.h>
void main()
{
    char arr[10],ch,i,num,flag=0;
    printf("How many characters you want to enter:");
    scanf("%d",&num);
    if(num>10)
    {
        printf("Size cannot be greater than 10.Try again...!");
    }
    else
    {
        /*Reading the array elements*/
        printf("Enter the array elements:\n");
        for(i=0;i<num;i++)
        {
            fflush(stdin);
            scanf("%c",&arr[i]);
        }
        /*Reading the character to search in the array*/
        printf("Enter the character you want to search:");
        fflush(stdin);
        scanf("%c",&ch);
        /*Code to check if the character is available in the array or not*/
        for(i=0;i<num;i++)
        {
            if(arr[i]==ch)
            {
                printf("%c is found at index %d\n",ch,i);
                flag = 1;
            }
        }
        if(flag==0)
        printf("Given character is not available in the array.");
    }
    getch();
}


Sample input and output:

How many characters you want to enter:5
Enter the array elements:
a
b
c
d
e
Enter the character you want to search:b
b is found at index 1

C program to search for a given number in an array

Below is a C program which allows an user to enter a maximum of 10 numbers. It also allows an user to search whether a given number is available or not. If the given number is available, the program displays the index within the array at which the number is found.

/*Program to search for a given number in an array*/
#include<stdio.h>
#include<conio.h>
void main()
{
    int arr[10],n,i,num,flag=0;
    printf("How many numbers you want to enter:");
    scanf("%d",&num);
    if(num>10||num<1)
    {
        printf("Size cannot be greater than 10 and less than 1.Try again...!");
    }
    else
    {
        /*Reading the array elements*/
        printf("Enter the array elements:\n");
        for(i=0;i<num;i++)
        {
            scanf("%d",&arr[i]);
        }
        /*Reading the number to search in the array*/
        printf("Enter the number you want to search:");
        scanf("%d",&n);
        /*Code to check if the number is available in the array or not*/
        for(i=0;i<num;i++)
        {
            if(arr[i]==n)
            {
                printf("%d is found at index %d\n",n,i);
                flag = 1;
            }
        }
        if(flag==0)
        printf("Given number is not available in the array.");
    }
    getch();
}


Sample input and output:

How many numbers you want to enter:5
Enter the array elements:
1 2 3 4 5
Enter the number you want to search:3
3 is found at index 2

C program to read integers into an array and print them back

Below is a C program which accepts a maximum of 10 numbers from the user, stores them in an array and prints them back.

/*Program to read n numbers into an array and print them*/
#include<stdio.h>
#include<conio.h>
void main()
{
    int a[10],num,i;
    printf("Enter the number of elements:");
    scanf("%d",&num);
    if(num>10)
    {
        printf("No of elements cannot be more than 10. Try again..!");
    }
    else
    {
        /*Reading array elements*/
        for(i=0;i<num;i++)
        scanf("%d",&a[i]);
        /*Printing the array elements*/
        printf("Elements in the array are:\n");
        for(i=0;i<num;i++)
        printf("%d ",a[i]);
    }
    getch();
}


Sample input and output:

Enter the number of elements:6
1 3 5 7 9 0
Elements in the array are:
1 3 5 7 9 0

C program to read characters into an array and print them

Below is a C program which accepts a maximum of 10 characters from the user, stores them in an array and prints the array back.

/*Program to read n characters into an array and print them*/
#include<stdio.h>
#include<conio.h>
void main()
{
    char a[10],num,i;
    printf("Enter the number of elements:");
    scanf("%d",&num);
    if(num>10)
    {
        printf("No of elements cannot be more than 10. Try again..!");
    }
    else
    {
        /*Reading the array elements*/
        printf("Enter the elements:\n");
        for(i=0;i<num;i++)
        {
            fflush(stdin);
            scanf("%c",&a[i]);
        }
        /*Printing the array elements*/
        printf("Elements in the array are:\n");
        for(i=0;i<num;i++)
        printf("%c ",a[i]);
    }
    getch();
}


Sample input and output:

Enter the number of elements:5
Enter the elements:
a
f
u
w
k
Elements in the array are:
a f u w k

C program to reverse the elements in an array and print it

Below is C program which allows a user to enter a maximum of 10 numbers, then reverses the array using a temporary variable and finally prints the elements of the reversed array.

/*Program to reverse an array using a temporary variable*/
#include<stdio.h>
#include<conio.h>
void main()
{
    int arr[10],n,i,j,temp;
    printf("Enter the number of elements:");
    scanf("%d",&n);
    if(n>10 || n<1)
    {
        printf("Invalid size.Try again...!");
    }
    else
    {
        /*Reading the array elements*/
        printf("Enter the elements into the array:\n");
        for(i=0;i<n;i++)
        scanf("%d",&arr[i]);
        /*Reversing the elements in the array*/
        for(i=0,j=n-1;i<n/2;i++,j--)
        {
            temp = arr[i];
            arr[i] = arr[j];
            arr[j] = temp;
        }
        /*Prinitng the array elements after reversing it*/
        printf("After reversing, the array elements are:\n");
        for(i=0;i<n;i++)
        printf("%d ",arr[i]);
    }
    getch();
}


Sample input and output:

Enter the number of elements:6
Enter the elements into the array:
1 2 3 4 5 6
After reversing, the array elements are:
6 5 4 3 2 1