#include<stdio.h>
void Accepttimes(int *a, int n)
{
  int i;
  printf("\n Enter values:");
  for(i=0;i<n;i++)
  {
    scanf("%d",&a[i]);
  }
}

void displaytimes(int *a, int n)
{
  int i;
  printf("\t");
  for(i=0;i<n;i++)
  {
    printf("\n %d",a[i]);
  }
  
}
int main()
{
  int arr[10],tat[10],wt[10],bt[10],ct[10]={0}, atat=0, awt=0,sum=0, i,n;
  printf("\n Enter number of processes to execute:");
  scanf("%d",&n);
  printf("\n Accepting arrival time:");
  Accepttimes(arr,n);
  printf("\n Accepting Burst time");
  Accepttimes(bt,n);
  printf("\n Calculate completion  time:");
  
  ct[0]=bt[0];
  for(i=1;i<n;i++)
  {
    if(arr[i]<ct[i-1])
    {
      ct[i]=ct[i-1]+bt[i];
    }
    else
    {
      ct[i]=(ct[i-1]+bt[i])+(arr[i]-ct[i-1]);
    }
  }
  //displaytimes(ct, n);
  printf("\n Success");
  printf("\n Calculate turnaround  time :");
  for(i=0;i<n;i++)
  {
      tat[i]=ct[i]-arr[i];
  }
  
  printf("\n Calculate waiting time");
  for(i=0;i<n;i++)
  {
    wt[i]=(tat[i]-bt[i]);
    
  }
  printf("\n");
  printf("\t Turnaround time is");
  displaytimes(tat,n);
  printf("\t Waiting times");
  displaytimes(wt,n);
  printf("\n Average turnnaruound time");
  for(i=0;i<n;i++)
  {
    sum=sum+tat[i];
  }
  atat=sum/n;
  
  printf("\t %d",atat);
  sum=0;
  printf("\n Average waiting time");
  for(i=0;i<n;i++)
  {
    sum=sum+wt[i];
  }
  awt=sum/n;
  printf("\t %d",awt);
  printf("\nGannt chart is :");
  
  for(i=0;i<n;i++)
  {
     printf("\t p%d",i+1);
     
  }
  printf("\n");
  printf("\t 0");
  for(i=0;i<n;i++)
  {
    if(ct[i]<arr[i+1])
    {
      printf("\t %d",ct[i]);
      printf("\t %d",arr[i+1]);
    }
    else
    {
      printf("\t %d",ct[i]);
    }
  }
  return 0;
}
by

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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
}