Pointers (Lecture Notes) : CUSAT s1s2 Questions

Hi friends,

Here I'm posting some important concepts asked in CUSAT B Tech S1 S2 C programming examination. All the concepts are descried here in very briefly so that you can grasp it quickly.

Here we go..!!! :)

Pointer

· Pointer is a variable that represents the location of a data item.

· Address operator (&) : It evaluates the address of its operand.

· Indirection Operator(*): Used to access data item referenced by a pointer.

Example:

Main()

{

Int a=3;

Int *ptr;

Ptr=&a;

Printf(“%d %u” , *ptr, ptr);

}

Pointer to an array

· A pointer can be used to reference an array.

· The name of an array will work as the pointer to its first element.

Main()

{

Int a[]= { 1, 2 , 3, 4};

Int *ptr =a;

For(int i=0; i<4;i++)

{

Printf(“%d”,* ptr+i);

}

Arrays of Pointers

· A group of pointers are stored in an array.

· Arrays of pointers can be used to store multidimensional arrays

Datatype *array[size];

Structures:

· A collection of heterogeneous elements.

· In structure memory will be allocated for each element.

Struct student {

Char name[20];

Int mark;

};

Union

· Similar to structures, A collection of heterogeneous elements.

· Memory will be allocated for largest member only. Other members have to share this memory.

union student {

Char name[20];

Int mark;

};

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SELECTION SORT ~ CUSAT Previous Questions with Answers- C programming.( S1 S2)

Hi friends,

Here I'm posting a C program implementing Selection sort. It is specially dedicated to S1 S2 B tech students because Selection sort is one of the most frequently asking questions in "Computer  Programming" exams. Hope this will be Useful  4  you.!!! :)



#include<stdio.h>
#include<conio.h>
void main()
{
clrscr();
int n,i,j,temp,a[50]; 

printf("\nEnter how many elements=");
scanf("%d",&n); 

printf("\nEnter %d elements",n);// Input the elements
for(i=0;i<n;i++)
{
scanf("%d",&a[i]);
} 



for(i=0;i<n-1;i++)// Sorting the elements
{
for(j=i+1;j<n;j++)
{
if(a[i]>a[j])
{
temp=a[j];
a[j]=a[i];
a[i]=temp;
}
}
}
printf("\nSorted Array:\n");
for(i=0;i<n;i++)
{
printf("%d\n",a[i]);
}

}


Any doubt in the code? Comment it here..!!

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CUSAT Previous Questions with Answers- C programming.( S1 S2)

Hi Friends,


here I'm posting one of the frequently asking question in CUSAT B tech C programming ( s 1 s2 ) and its solution:

Question:

Write a C program which prints all Armstrong numbers between 1 and 1000.


Solution:



#include<stdio.h>
main()
{
int number, temp, digit=0, dup;

printf("Printing all Armstrong numbers between 1 and 500:\n\n");

number = 1;

while (number <= 500)
{
temp=0;
dup=number;
while(dup>0)
{
digit=dup%10;
temp+=(digit*digit*digit);
dup=dup/10;
}
if (temp==number)
{
printf("\nAmstrong Number:%d", temp);
}
number++;
}
getch();
}
 

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