C program to reverse an array.

C program to reverse an array.

#include <stdio.h>

int main()

{

   int n, c, d, a[100], b[100];

   printf("Enter the number of elements in array\n");

   scanf("%d", &n);

   printf("Enter the array elements\n");

   for (c = 0; c < n ; c++)

      scanf("%d", &a[c]);

   /*

    * Copying elements into array b starting from end of array a

    */

   for (c = n - 1, d = 0; c >= 0; c--, d++)

      b[d] = a[c];

   /*

    * Copying reversed array into original.

    * Here we are modifying original array, this is optional.

    */

   for (c = 0; c < n; c++)

      a[c] = b[c];

   printf("Reverse array is\n");

   for (c = 0; c < n; c++)

      printf("%d\n", a[c]);

   return 0;

}

Output:-

C program to merge two arrays.

C programming code to merge two sorted arrays

#include <stdio.h>

 

void merge(int [], int, int [], int, int []);

 

int main() {

  int a[100], b[100], m, n, c, sorted[200];

 

  printf("Input number of elements in first array\n");

  scanf("%d", &m);

 

  printf("Input %d integers\n", m);

  for (c = 0; c < m; c++) {

    scanf("%d", &a[c]);

  }

 

  printf("Input number of elements in second array\n");

  scanf("%d", &n);

 

  printf("Input %d integers\n", n);

  for (c = 0; c < n; c++) {

    scanf("%d", &b[c]);

  }

 

  merge(a, m, b, n, sorted);

 

  printf("Sorted array:\n");

 

  for (c = 0; c < m + n; c++) {

    printf("%d\n", sorted[c]);

  }

 

  return 0;

}

 

void merge(int a[], int m, int b[], int n, int sorted[]) {

  int i, j, k;

 

  j = k = 0;

 

  for (i = 0; i < m + n;) {

    if (j < m && k < n) {

      if (a[j] < b[k]) {

        sorted[i] = a[j];

        j++;

      }

      else {

        sorted[i] = b[k];

        k++;

      }

      i++;

    }

    else if (j == m) {

      for (; i < m + n;) {

        sorted[i] = b[k];

        k++;

        i++;

      }

    }

    else {

      for (; i < m + n;) {

        sorted[i] = a[j];

        j++;

        i++;

      }

    }

  }

}

Output:-

Matrix multiplication in c.

Matrix multiplication in c language

#include <stdio.h>

 

int main()

{

  int m, n, p, q, c, d, k, sum = 0;

  int first[10][10], second[10][10], multiply[10][10];

 

  printf("Enter the number of rows and columns of first matrix\n");

  scanf("%d%d", &m, &n);

  printf("Enter the elements of first matrix\n");

 

  for (c = 0; c < m; c++)

    for (d = 0; d < n; d++)

      scanf("%d", &first[c][d]);

 

  printf("Enter the number of rows and columns of second matrix\n");

  scanf("%d%d", &p, &q);

 

  if (n != p)

    printf("Matrices with entered orders can't be multiplied with each other.\n");

  else

  {

    printf("Enter the elements of second matrix\n");

 

    for (c = 0; c < p; c++)

      for (d = 0; d < q; d++)

        scanf("%d", &second[c][d]);

 

    for (c = 0; c < m; c++) {

      for (d = 0; d < q; d++) {

        for (k = 0; k < p; k++) {

          sum = sum + first[c][k]*second[k][d];

        }

 

        multiply[c][d] = sum;

        sum = 0;

      }

    }

 

    printf("Product of entered matrices:-\n");

 

    for (c = 0; c < m; c++) {

      for (d = 0; d < q; d++)

        printf("%d\t", multiply[c][d]);

 

      printf("\n");

    }

  }

 

  return 0;

}

Output:-