 #include <stdio.h>
int main()
{
   
int i,n,count=0,time_quantum,t=0,at[10],bt[10],rem_bt[10],wt[10],tat[10],flag=0;
float total_wt=0 , total_tat=0;
printf("Enter Total Processes:\t ");
scanf("%d",&n);
for(i=0;i<n;i++)
{ 
printf("Enter Burst Time for Process %d :",i+1);
scanf("%d",&bt[i]); 
}
printf("Enter Time Quantum:\t");
scanf("%d",&time_quantum);
for (i = 0 ; i < n ; i++) 
        rem_bt[i] =  bt[i]; 
t = 0; // Current time 
// Keep traversing processes in round robin manner  until all of them are not done. 
while (1) 
{ 
flag=1; 
// Traverse all processes one by one repeatedly 
for (i = 0 ; i < n; i++) 
{  
// If burst time of a process is greater than 0 then only need to process further 
if (rem_bt[i] > 0) 
{  
flag=0; // There is a pending process 
  if (rem_bt[i] > time_quantum)  
  { 
 // Increase the value of t i.e. shows how much time a process has been processed 
 t += time_quantum; 
  // Decrease the burst_time of current process by quantum 
  rem_bt[i] = rem_bt[i]-time_quantum;
  }  
// If burst time is smaller than or equal to quantum. Last cycle for this process 
else
{  
// Increase the value of t i.e. shows how much time a process has been processed 
  t = t + rem_bt[i]; 
   // Waiting time is current time minus time used by this process 
  wt[i] = t - bt[i]; 
  // As the process gets fully executed make its remaining burst time = 0
   rem_bt[i] = 0; 
}//else
} //if
}//for
if (flag==1) 
break;
} //while
for (i = 0; i < n ; i++)
 tat[i] = bt[i] + wt[i];
printf("\n Process  BT\t WT\t TAT \n");
for(i=0;i<n;i++) 
printf("\n %d \t %d \t %d \t %d \t",i+1,bt[i],wt[i],tat[i]);
for (i = 0; i < n ; i++)
{ 
total_wt= total_wt+wt[i];
total_tat= total_tat+tat[i]; 
}
printf("\nAverage waiting time = %f",  total_wt/n);
printf ("\nAverage turn around time = %f",total_tat/n);
} //main

created 4 years ago by Gopathi Gayathri

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#include <stdio.h>
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    return 0;
    
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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

Library Functions:

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

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
}