C Program to Find Largest Number Using Dynamic Memory Allocation

What are Pointers?

A pointer is a variable whose value is the address of another variable, i.e., direct address of the memory location. Like any variable or constant, you must declare a pointer before using it to store any variable address.

The general form of a pointer variable declaration is −

• type *var-name;

Here, type is the pointer’s base type; it must be a valid C data type and var-name is the name of the pointer variable.

The asterisk * used to declare a pointer is the same asterisk used for multiplication. However, in this statement the asterisk is being used to designate a variable as a pointer.

The unary or monadic operator & gives the “address of a variable’”.

The indirection or dereference operator * gives the “contents of an object pointed to by a pointer”.

Below is the source code for C Program to Find Largest Number Using Dynamic Memory Allocation which is successfully compiled and run on Windows System to produce desired output as shown below :

SOURCE CODE : :

/*  C Program to Find Largest Number Using Dynamic Memory Allocation  */

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

int main()
{
    int i, num;
    float *data;

    printf("How many elements u want to enter :: ");
    scanf("%d", &num);

    // Allocates the memory for 'num' elements.
    data = (float*) calloc(num, sizeof(float));

    if(data == NULL)
    {
        printf("\nError!!! memory not allocated.");
        exit(0);
    }

    // Stores the number entered by the user.
    for(i = 0; i < num; ++i)
    {
       printf("\nEnter Number %d :: ", i + 1);
       scanf("%f", data + i);
    }

    // Loop to store largest number at address data
    for(i = 1; i < num; ++i)
    {
       // Change < to > if you want to find the smallest number
       if(*data < *(data + i))
           *data = *(data + i);
    }

    printf("\nLargest element = %.2f\n", *data);

    return 0;
}

Output : :

/*  C Program to Find Largest Number Using Dynamic Memory Allocation  */

How many elements u want to enter :: 6

Enter Number 1 :: 3

Enter Number 2 :: 1

Enter Number 3 :: 5

Enter Number 4 :: 7

Enter Number 5 :: 3

Enter Number 6 :: 8

Largest element = 8.00

Process returned 0

Above is the source code for C Program to Find Largest Number Using Dynamic Memory Allocation which is successfully compiled and run on Windows System.The Output of the program is shown above .