What will be the output of the following program? | Set-2

1. Write a program to allocate memory to represent a 2d array, where the size of the array will be provided by the user and we’ve to put some data and display those data in a matrix form

Here we are basically creating code for showing a Matrix

Input 1:

#include <stdio.h>
#include <stdlib.h>

int main()
{

    int **p;
    int i, j, r, c;

    // Get the number of elements for the array
    printf("Enter the number of rows: ");
    scanf("%d", &r);
    printf("Enter the number of column: ");
    scanf("%d", &c);

    // Dynamically allocate memory using malloc()
    p = (int **)malloc(sizeof(int *) * r);
    for (i = 0; i < r; i++)
    {
        *(p + i) = (int *)malloc(sizeof(int) * c);
    }
    printf("Enter elements of the array:n");
    for (i = 0; i < r; ++i)
    {
        for (j = 0; j < c; ++j)
        {
            scanf("%d", &p[i][j]);
            p[i][j] = *(*(p + i) + j);
        }
    }

    // printing the result
    printf("The answer is:n");
    for (i = 0; i < r; ++i)
        for (j = 0; j < c; ++j)
        {
            printf("%d   ", p[i][j]);
            if (j == c - 1)
            {
                printf("n");
            }
        }

    return 0;
}

Output 1:

write a program in C to insert 10 elements in array and display it

Input 2:

#include <stdio.h>
int main()
{
    int n, arr[20];
    printf("Enter the size ");
    scanf("%d", &n);

    for (int i = 0; i < n; i++)
    {
        printf("Enter the element ");
        scanf("%d", &arr[i]);
    }

    for (int j = 0; j < n; j++)
    {
        printf("The element of %d position is: %d n ",j, arr[j]);
    }

    return 0;
}

Output 2:

3. Write a program to exchange character from small to capital and vice versa.

Input

#include <stdio.h>
int main()
{
    char a;
    printf("Enter the character here-");
    scanf("%c",&a);
    if (a>=97 && a<=122)
       a=a-32;
    else if(a>=65 && a<=90)
    a=a+32;
    printf("The complementary alphabet is= %c",a);
    return 0;
}

Output

Write a code to concatinate two strings.

Input

#include <stdio.h> 
int main()
{

    char str1[100], str2[100];
    char str3[100];
    int i = 0, j = 0;
    printf("nEnter first string: ");
    scanf("%s", str1);
    printf("nEnter second string: ");
    scanf("%s", str2);
    while (str1[i] != '')
    {

        str3[j] = str1[i];
        i++;
        j++;
    }

    i = 0;
    while (str2[i] != '')

    {
        str3[j] = str2[i];
        i++;
        j++;
    }

    str3[j] = '';
    printf("nConcatenated string: %s", str3);
    return 0;
}

Output