Write a C program to swap two integers using pointers.

 Source code:

/*Write a C program to swap two integers using pointers. You have to write a swap function that will accept the address of two integer and swap their values.  */

#include <stdio.h>

void swap(int *a,int *b)

{

    int t;

     t   = *a;

    *a   = *b;

    *b   =  t;

}

int main()

{

    int num1,num2;

    printf("Enter 1st number: ");

    scanf("%d",&num1); /*Enter value of num1 */

    printf("Enter 2nd number: ");

    scanf("%d",&num2); /*Enter value of num2 */

     

    swap(&num1,&num2);

     

    /*print values after swapping */

    printf("num1=%d, num2=%d\n",num1,num2);    

    return 0;

}

Output:

Write a C Program to find if the given square matrix is skew symmetric or not.

 Source code:

/*A Matrix whose Transpose is negative to that of the original Matrix, it is known as a Skewed Symmetric Matrix. Write a C Program to find if the given square matrix is skew symmetric or not. 

Ex. A^T = -A*/

#include<stdio.h>

void tranpose();

void getmatrix();

int check();

 

int m, n, rows, columns;

int matrix[3][3], transpose[3][3];

void tranpose()

{

    for(rows = 0 ; rows < m ; rows++)

    {

        for(columns = 0; columns < n; columns++)

        {

            transpose[columns][rows] = matrix[rows][columns];

        }

    }

}

 

void getmatrix()

{

printf("Enter a matrix:\n");

    for(rows = 0; rows < m; rows++)

    {

        for(columns = 0; columns < n; columns++)

        {

            scanf("%d", &matrix[rows][columns]);

        }

    }

}

 

int check()

{

    if(m == n)

    {

        for(rows = 0; rows < m; rows++)

        {

            for(columns = 0; columns < m; columns++)

            {

                if(matrix[rows][columns] != -transpose[rows][columns])

                {

                    break;

                }

            }

            if(columns != m)

            {

                break;

            }

        }

    if(rows == m)

        {

            return 0;

        }

    }

    else

    {

        return 1;

    }

}

int main()

{

    int x;

    printf("Enter the number of row:");

    scanf("%d", &m); /*Enter the Number of Rows: */

    printf("Enter the number of column:");

    scanf("%d", &n); /*Enter the Number of Columns: */

    getmatrix();  /*Get the Elements of the Square Matrix from input case */

    tranpose(); /*Function to perform transpose of the matrix */

    x = check(); /*To check if the matrix is a skewed symmetric matrix */

    if(x == 0)

    {

        printf("The Entered Matrix is A Skewed Symmetric Matrix\n");

    }

    else

    {

        printf("The Entered Matrix is Not A Skewed Symmetric Matrix\n");

    }

    return 0;

}

Output:

Write a C program which will sort number of elements in an ascending by using bubble sort using pointer.

 Source code:

/*Write a C program which will sort number of elements in an ascending by using bubble sort. We will rewrite the algorithm by using pointer. Read 5 elements and sort in ascending order. */

#include<stdio.h>

void bubble(int *ptr,int s)

{

int i,j;

int temp;

for(i=1;i<s;i++)

  {

  for(j=0;j<s-i;j++)

    {

    if(*(ptr+j)>*(ptr+j+1))

    {

      temp=*(ptr+j);

      *(ptr+j)=*(ptr+j+1);

      *(ptr+j+1)=temp;

    }

    }

}

}

int main()

{

int arr[10];

int i;

int size=5;

/* Read Array Elements */

printf("Enter 10 elements: ");

for(i=0;i<size;i++)

scanf("%d",&arr[i]);

 

bubble(arr,size);

printf("The sorted elements:\n");

for(i=0;i<size;i++)

printf("%d\n",arr[i]);

return 0;

}

Output:

Write a C program which sort strings in lexicographical order.

 Source code:

//Write a C program which sort strings in lexicographical order.

#include<stdio.h>

#include <string.h>

int main()

{

    int i, j;

    char str[10][50], temp[50];

printf("Enter a string: ");

    /* Read 10 elements */

    for(i=0; i<10; ++i)

        scanf("%s[^\n]",str[i]);

for(i=0; i<9; ++i)

        for(j=i+1; j<10 ; ++j)

        {

            if(strcmp(str[i], str[j])>0)

            {

                strcpy(temp, str[i]);

                strcpy(str[i], str[j]);

                strcpy(str[j], temp);

            }

        }

printf("In Lexicographical Order\n");

    for(i=0; i<10; ++i)

    {

        puts(str[i]);

    }

    return 0;

}

Output:

Write a C program to pass multidimensional array to a function as it's parameter.

 Source code:

/*Consider a program, of passing multidimensional array to a function. Consider an two dimensional array of size 3x3 and write a function. Write a function displayarray() by passing two dimensional array as it's parameter.*/

#include<stdio.h>

void displayarray(int arr[3][3]);

void displayarray(int arr[3][3])

{

    int i, j;

    printf("The complete array is");

    for (i = 0; i < 3; ++i)

    {

        printf("\n");

                 

      for (j = 0; j < 3; ++j)

        {

            printf("%d ", arr[i][j]);

        }

    }

}

int main()

{

    int arr[3][3], i, j;

    /* Read 9 elements */    

    printf("Enter a matrix:\n");

for (i = 0; i < 3; ++i)

    {

        for (j = 0; j < 3; ++j)

        {

            scanf("%d", &arr[i][j]);

        }

    }

   /* passing the array as argument */

    displayarray(arr);

    return 0;

}

Output:

Write a C program to find average using findavg() function.

Source code:

 /*Consider the function find average findavg() , which takes an array as an argument along with another argument and based on the passed arguments and it returns the average of the numbers passed through the array. Consider an array of size 10. It reads 5 marks and find the average.  */

#include<stdio.h>

int findavg(int marks[]);

int findavg(int marks[])

{

    int i, sum = 0;

    int avg;

    for (i = 0; i <= 4; i++) {

        sum += marks[i];

    }

    avg = (sum / 5);

    return avg;

}

int main()

{

    int avg; int marks[10];int i;int n=5;

    /* Read Marks*/

    printf("Enter marks of 5 subject: ");

    for (i=0; i<n; i++)

        scanf("%d",&marks[i]);

    avg = findavg(marks);

    printf("Average=%d", avg);

    return 0;

}

Output: