#include<stdio.h>
#include<stdlib.h>
int MAX=4,count;
struct student
{
char usn[10];
char name[89];
char branch[4];
int sem;
char phno[10];
struct student*next;
};
typedef struct student NODE;
NODE*head;
int countnodes()
{
NODE*p;
count=0;
p=head;
while(p!=NULL)
{
p=p->next;
count++;
}
return count;
}
NODE*getnode()
{
NODE*newnode;
newnode=(NODE*)malloc(sizeof(NODE));
printf("\nenter usn,name,branch,sem,phno\n");
fflush(stdin);
gets(newnode->usn);
fflush(stdin);
gets(newnode->name);
fflush(stdin);
gets(newnode->branch);
fflush(stdin);
gets(newnode->sem);
scanf("%d",&(newnode->sem));
fflush(stdin);
gets(newnode->phno);
newnode->next=NULL;
return newnode;
}
NODE*display()
{
NODE*p;
if(head==NULL)
printf("\nno student data\n");
else
{
p=head;
printf("\n____ STUDENT DATA____\n");
printf("\nusn\ntname\t\tbranch\tsem\tphno");
while(p!=NULL)
{
printf("\n%s\t%s\t\t%s\t%d\t%s",p->usn,p->name,p->branch,p->sem,p->phno);
p=p->next;
}printf("\nthe no of nodes in list is:%d",countnodes(head));
}
return head;
}
NODE* create()
{
NODE*newnode;
if(head==NULL)
{
newnode=getnode();
head=newnode;
}
else
{
newnode=getnode();
newnode->next=head;
head=newnode;
}
return head;
}
void insert_front()
{
if(countnodes(head)==MAX)
printf("\nlist is full!");
else
head=create();
}
void insert_rear()
{
NODE*p,*newnode;
p=head;
if(countnodes(head)==MAX)
printf("\nlist is full(QUEUE)!!");
else
{
if(head==NULL)
{
newnode=getnode();
head=newnode;
}
else
{
newnode=getnode(head);
while(p->next!=NULL)
{
p=p->next;
}
p->next=newnode;
}
}
}
void insert()
{
int ch;
do
{
printf("\n1.insert at front(first)\t2.insert at END(rear/last)\t3.exit");
printf("\nenter your choice:");
scanf("%d",&ch);
switch(ch)
{
case 1:insert_front();break;
case 2:insert_rear();break;
case 3:break;
}
display();
}
while(ch!=3);
}
void delete_front()
{
NODE*p;
if(head==NULL)
printf("\nlist is empty/underflow(STACK/QUEUE)");
else
{
p=head;
head=head->next;
free(p);
printf("\nfront(first)node is deleted");
}
}
void delete_rear()
{
NODE*p,*q;
p=head;
if(count==1)
{
delete_front();
return;
}
while(p->next!=NULL)
{
q=p;
p=p->next;
}
free(p);
q->next=NULL;
printf("\nlast(end)entry is deleted");
}
void del()
{
int ch;
do
{
printf("\n1.delete from front(first)\t2.delete from end(rear/last)\t3.exit");
printf("nenter your choice:");
scanf("%d",&ch);
switch(ch)
{
case 1: delete_front();
break;
case 2:delete_rear();
break;
case 3: break;
}
display();
}while(ch!=3);
}
NODE*stack()
{
int ch;
do
{
printf("\nSSL used as stack...");
printf("\n1.1.insert at front(PUSH)\t2.delete from front(POP))\t3.exit");
printf("\nenter your choice:");
scanf("%d",&ch);
switch(ch)
{
case 1:insert_front();
break;
case 2:delete_front();
break;
case 3:break;
}
display();
}while(ch!=3);
}
void queue()
{
int ch;
do
{
printf("\nSSL used as queue...");
printf("\n 1.insert at rear(insert)\t 2.delete front(delete))\t.exit");
printf("\nenter your choice:");
scanf("%d",&ch);
switch(ch)
{
case 1:insert_rear(); break;
case 2:delete_front();break;
case 3:break;
}
display();
}while(ch!=3);
}
void main()
{
int ch,i,n;
head=NULL;
printf("\n*----------student database----------*");
do
{
printf("\n 1.create\t 2.display\t 3.insert\t 5.stack\t 6.queue\t 7.exit");
printf("\nenter your choice:");
scanf("%d", &ch);
switch(ch)
{
case 1 : printf("\nhow many student data you want to create:");
scanf("%d",&n);
for(i=0;i<n;i++)
create();
break;
case 2:display();
break;
case 3:insert();
break;
case 4:del();
break;
case 5:stack();
break;
case 6:queue();
break;
case 7:exit(0);
}
}while(ch!=7);
}
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#include <stdio.h>
int main()
{
char name[50];
printf("Enter name:");
scanf("%s", name);
printf("Hello %s \n" , name );
return 0;
}
C language is one of the most popular general-purpose programming language developed by Dennis Ritchie at Bell laboratories for UNIX operating system. The initial release of C Language was in the year 1972. Most of the desktop operating systems are written in C Language.
When ever you want to perform a set of operations based on a condition if-else is used.
if(conditional-expression) {
// code
} else {
// code
}
You can also use if-else for nested Ifs and if-else-if ladder when multiple conditions are to be performed on a single variable.
Switch is an alternative to if-else-if ladder.
switch(conditional-expression) {
case value1:
// code
break; // optional
case value2:
// code
break; // optional
...
default:
// code to be executed when all the above cases are not matched;
}
For loop is used to iterate a set of statements based on a condition.
for(Initialization; Condition; Increment/decrement){
// code
}
While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.
while(condition) {
// code
}
Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.
do {
// code
} while (condition);
Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.
data-type array-name[size];
data-type array-name[size][size];
Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity.
Two types of functions are present in C
Library functions are the in-built functions which are declared in header files like printf(),scanf(),puts(),gets() etc.,
User defined functions are the ones which are written by the programmer based on the requirement.
return_type function_name(parameters);
function_name (parameters)
return_type function_name(parameters) {
//code
}