C Malloc()

Why Malloc?

Now it's time to partition the microprocessor's memory to your 6 teams of your startup company, If you want to allocate contiguous memory location to every team, then malloc() will help you out there.

What is Malloc?

• malloc() is the programmer's shorthand to represent memory allocation.
• malloc() allocates a block of size bytes to a program from the heap.
• malloc() allocate an exact quantity of memory explicitly to a program, when required.
• allocation of memory is done in contiguous location.

Syntax - Malloc()

void *malloc  (size_t size);

C program - without using malloc() for unknown data

In the following program we will consider that we want to store two integer data , but unfortunately we are forced to store 4 integer data, but we allocated an array of size 2. Let us see what happen when we add 4 integer data in an array whose size is 2.

#include <stdio.h>
int main()
{
int numbers[2], i;
numbers[0] = 0;
numbers[1] = 1;
numbers[2] = 2;
numbers[3] = 3;
printf("\nStored integers are ");
for(i = 0; i < 4; i++)
printf("\nnumbers[%d] = %d ", i, numbers[i]);
return 0;
}

C program - using malloc() for unknown data

Let us redesign the above program using malloc() instead of array because when a memory is allocated either by using malloc() or calloc() inbuilt function, it can be reallocated using realloc() inbuilt function when some memory is demanded.

#include <stdio.h>
#include <stdlib.h>
int main()
{
int *numbers = (int*)malloc(4* sizeof(int));
int i;
numbers[0] = 0;
numbers[1] = 1;
numbers[2] = 2;
numbers[3] = 3;
printf("\nStored integers are ");
for(i = 0; i < 4; i++)
printf("\nnumbers[%d] = %d ", i, numbers[i]);
return 0;
}

Did You Know?

Once a block memory is allocated by using malloc() inbuilt function. Each individual blocks of memory are represented by some garbage value.

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