# C PROGRAMS
Pointers Examples
➤ Pointer Basic Examples
➤ Dynamic Memory Allocation
➤ Read Write Array with Pointer
➤ Sum Avg of Array with Pointer
➤ Sort Array with Pointer
➤ Search in Array using Pointer
➤ Sum of N Numbers
➤ Largest Number by DMA
Others
➤ C Program Without Main()
➤ Hello World Without ;
➤ Process & Parent Process ID
➤ C Program Without Header File
➤ void main(), main() vs int main()
➤ fork() function in C
➤ Why gets function is dangerous
➤ Undefined reference to sqrt
Relation between Array and Pointer
In C programming, the name of the array always points to address of the first element of an array So, &arr[0] is equivalent to arr. Since the addresses of both are the same, the values of arr and &arr[0] are also the same.
arr[0] is equivalent to *arr (value of an address of the pointer)
Similarly,
&arr[1] is equivalent to (arr + 1) AND, arr[1] is equivalent to *(arr + 1)
&arr[2] is equivalent to (arr + 2) AND, arr[2] is equivalent to *(arr + 2)
&arr[3] is equivalent to (arr + 3) AND, arr[3] is equivalent to *(arr + 3)
&arr[i] is equivalent to (arr + i) AND, arr[i] is equivalent to *(arr + i)
C Program to Read and write an array using the
#include<stdio.h>
int main()
{
int x[5], i;
int *pa;
pa = &x[0]; // or, pa = &x;
printf("Enter array element: ");
for(i=0;i<5;i++)
{
scanf("%d", (pa+i));
}
printf("Displaying Array: ");
for(i=0;i<5;i++)
{
printf("%d\t",*(pa+i));
}
printf("\n");
return 0;
}Output:-
Enter array element: 5
10
15
20
25
Displaying Array: 5 10 15 20 25
Read and write an array using function and pointer
#include<stdio.h>
void read(int *p);
void display(int *q);
int main()
{
int a[5];
read( &a[0] );
display( &a[0] );
return 0;
}
void read(int *p)
{
int i;
printf("Enter array elements: ");
for(i=0;i<5;i++)
{
scanf("%d",p+i);
}
}
void display(int *q)
{
int i;
printf("Array elements are:\n");
for(i=0;i<5;i++)
{
printf("%d\t",*(q+i));
}
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