#include<stdio.h> 
#include<conio.h> 
#include<alloc.h> 
#define NULL 0 
struct info 
{ 
int data; 
struct info *next; 
}; 
struct info *head,*temp,*disp; 
void additem(); 
void delitem(); 
void display(); 
int size(); 
void search(); 
void main() 
{ 
int choice; 
clrscr(); 
while(1) 
{ 
printf("\n1.Add records"); 
printf("\n2.Delete records"); 
printf("\n3.Display records"); 
printf("\n4.Count no. of items in the list");
printf("\n5.Searching an item in the list"); printf("\n6.Exit"); 
printf("\nEnter your choice:"); 
scanf("%d",&choice); 
fflush(stdin); 
switch(choice) 
{ 
case 1: 
 additem(); 
 break; 
case 2: 
 delitem(); 
 break; 
case 3: 
 display(); 
 break; 
case 4: 
 printf("\nThe size of the list is %d",size());  break; 
case 5: 
 search(); 
 break; 
case 6: 
 exit(0); 
} 
} 
} 
void additem() 
{ 
struct info *add; 
char proceed='y'; 
while(toupper(proceed)=='Y') 
{ 
add=(struct info*)malloc(sizeof(struct info)); printf("Enter data:"); 
scanf("%d",&add->data); 
fflush(stdin); 
if(head==NULL) 
{ 
head=add; 
add->next=NULL; 
temp=add;
} 
else 
{ 
temp->next=add; 
add->next=NULL; 
temp=add; 
} 
printf("\nWant to proceed y/n"); 
proceed=getchar(); 
fflush(stdin); 
} 
} 
void delitem() 
{ 
struct info *curr,*prev; 
int tdata; 
if(head==NULL) 
{ 
printf("\nNo records to delete"); 
return; 
} 
printf("\nEnter the data to delete"); scanf("%d",&tdata); 
fflush(stdin); 
prev=curr=head; 
while((curr!=NULL)&&(curr->data!=tdata)) { 
prev=curr; 
curr=curr->next; 
} 
if(curr==NULL) 
{ 
printf("\nData not found"); 
return; 
} 
if(curr==head) 
 head=head->next; 
else 
{ 
/*for inbetween element deletion*/ prev->next=curr->next; 
/*for the last element deletion*/
if(curr->next==NULL) 
 temp=prev; 
} 
free(curr); 
} 
void display() 
{ 
if(head==NULL) 
{ 
printf("\nNo data to display"); 
return; 
} 
for(disp=head;disp!=NULL;disp=disp->next) { 
printf("Data->%d",disp->data); 
} 
} 
int size() 
{ 
int count=0; 
if(head==NULL) 
 return count; 
for(disp=head;disp!=NULL;disp=disp->next)  count++; 
return count; 
} 
void search() 
{ 
int titem,found=0; 
if(head==NULL) 
{ 
printf("\nNo data in the list"); 
return; 
} 
printf("\Enter the no. to search:"); 
scanf("%d",&titem); 
for(disp=head;disp!=NULL&&found==0;disp=disp->next) { 
if(disp->data==titem) 
 found=1; 
} 
if(found==0)
 printf("\nSearch no. is not present in the list"); else 
 printf("\nSearch no. is present in the list"); return; 
}

C Language online compiler

Write, Run & Share C Language code online using OneCompiler's C online compiler for free. It's one of the robust, feature-rich online compilers for C language, running the latest C version which is C18. Getting started with the OneCompiler's C editor is really simple and pretty fast. The editor shows sample boilerplate code when you choose language as 'C' and start coding!

Read inputs from stdin

OneCompiler's C online editor supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample C program which takes name as input and print your name with hello.

#include <stdio.h>
int main()
{
    char name[50];
    printf("Enter name:");
    scanf("%s", name);
    printf("Hello %s \n" , name );
    return 0;
    
}

About C

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.

Key features:

  • Structured Programming
  • Popular system programming language
  • UNIX, MySQL and Oracle are completely written in C.
  • Supports variety of platforms
  • Efficient and also handle low-level activities.
  • As fast as assembly language and hence used as system development language.

Syntax help

Loops

1. If-Else:

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.

2. Switch:

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;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  // code  
}

4. While:

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 
}

5. Do-While:

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);

Arrays

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.

Syntax

One dimentional Array:

data-type array-name[size];

Two dimensional array:

data-type array-name[size][size];

Functions

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

  1. Library Functions:

Library functions are the in-built functions which are declared in header files like printf(),scanf(),puts(),gets() etc.,

  1. User defined functions:

User defined functions are the ones which are written by the programmer based on the requirement.

How to declare a Function

return_type function_name(parameters);

How to call a Function

function_name (parameters)

How to define a Function

return_type function_name(parameters) {  
  //code
}