C Program to demonstrate dynamic memory allocation example.

Write a C Program to demonstrate dynamic memory allocation example.
Dynamic memory allocation means you can allocate or relocate (manipulate) the memory at the run time, using malloc, calloc, and realloc functions.
Using malloc, We can allocate block of memory for a variable
Using calloc function, We can allocate multiple blocks of memory for a variable.
We can alter, reassign the allocated memory using the realloc function.
We can releasing the allocated memory using the free function. Read more about C Programming Language .

/***********************************************************
* You can use all the programs on www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact info@c-program-example.com
* To find more C programs, do visit www.c-program-example.com
* and browse!
*
* Happy Coding
***********************************************************/



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

int main() {
int* grades;
int sum = 0, i, numberOfStudents;
float average;


printf("Enter the number of students: ");
scanf("%d", &numberOfStudents);
getchar();

if((grades = (int*) malloc(numberOfStudents * sizeof(int))) == NULL) {
printf("nError: Not enough memory to allocate grades arrayn");
exit(1);
}

printf("nEnter the grades of %d students (in separate lines):n", numberOfStudents);

for(i = 0; i < numberOfStudents; i++) {
scanf("%d", &grades[i]);
getchar();
}

/* calculate sum */
for(i = 0; i < numberOfStudents; i++)
sum += grades[i];

/* calculate the average */
average = (float) sum / numberOfStudents;

printf("nThe average of the grades of all students is %.2f",
average);

getchar();
return(0);
}

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C Program which produces its own source code as its output.

Write a c program which produces its own source code as its output.
This C program uses the C File i/o operations like fopen(), fclose(). In this program, We pritn the source code of the program.Read more about C Programming Language .

/***********************************************************
* You can use all the programs on www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact info@c-program-example.com
* To find more C programs, do visit www.c-program-example.com
* and browse!
*
* Happy Coding
***********************************************************/

#include<stdio.h>
int main()
{
FILE *fp;
char c;

fp = fopen(__FILE__,"r");

do{

c= getc(fp);

putchar(c);

}
while(c!=EOF);

fclose(fp);

return 0;

}


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C Basic

C File i/o

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C Program to find the strong number.

Write a C Program to find the given number is strong or not?
A number is called strong number if sum of the factorial of its digit is equal to number itself.
Example: 145 since 1! + 4! + 5! = 1 + 24 + 120 = 145.
Read more about C Programming Language .

/***********************************************************
* You can use all the programs on www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact info@c-program-example.com
* To find more C programs, do visit www.c-program-example.com
* and browse!
*
* Happy Coding
***********************************************************/
#include<stdio.h>
#include<conio.h>

int main()
{
int num,i,f,r,sum=0,num1;
clrscr();
printf("Enter a number: ");
scanf("%d",&num);

num1=num;
while(num){
i=1,f=1;
r=num%10;

while(i<=r){
f=f*i;
i++;
}
sum=sum+f;
num=num/10;

}
if(sum==num1)
printf("%d is a strong number",num1);
else
printf("%d is not a strong number",num1);
getch();
return 0;

}
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C Program for Simple DSC order Priority QUEUE Implementation

Data structures using C,Priority QUEUE is a abstract data type in which the objects are inserted with respect to certain priority. In this program, we created the simple descending order priority queue, here items are inserted in descending order. Read more about C Programming Language .

/***********************************************************
* You can use all the programs on www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact info@c-program-example.com
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* and browse!
*
* Happy Coding
***********************************************************/
#define SIZE 5 /* Size of Queue */
int PQ[SIZE],f=0,r=-1; /* Global declarations */

PQinsert(int elem)
{
int i; /* Function for Insert operation */
if( Qfull()) printf("nn Overflow!!!!nn");
else
{
i=r;
++r;
while(PQ[i] <= elem && i >= 0) /* Find location for new elem */
{
PQ[i+1]=PQ[i];
i--;
}
PQ[i+1]=elem;
}
}

int PQdelete()
{ /* Function for Delete operation */
int elem;
if(Qempty()){ printf("nnUnderflow!!!!nn");
return(-1); }
else
{
elem=PQ[f];
f=f+1;
return(elem);
}
}

int Qfull()
{ /* Function to Check Queue Full */
if(r==SIZE-1) return 1;
return 0;
}

int Qempty()
{ /* Function to Check Queue Empty */
if(f > r) return 1;
return 0;
}

display()
{ /* Function to display status of Queue */
int i;
if(Qempty()) printf(" n Empty Queuen");
else
{
printf("Front->");
for(i=f;i<=r;i++)
printf("%d ",PQ[i]);
printf("<-Rear");
}
}

main()
{ /* Main Program */
int opn,elem;
do
{
clrscr();
printf("n ### Priority Queue Operations(DSC order) ### nn");
printf("n Press 1-Insert, 2-Delete,3-Display,4-Exitn");
printf("n Your option ? ");
scanf("%d",&opn);
switch(opn)
{
case 1: printf("nnRead the element to be Inserted ?");
scanf("%d",&elem);
PQinsert(elem); break;
case 2: elem=PQdelete();
if( elem != -1)
printf("nnDeleted Element is %d n",elem);
break;
case 3: printf("nnStatus of Queuenn");
display(); break;
case 4: printf("nn Terminating nn"); break;
default: printf("nnInvalid Option !!! Try Again !! nn");
break;
}
printf("nnnn Press a Key to Continue . . . ");
getch();
}while(opn != 4);
}


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