#include <stdio.h>
#define max 5
int main()
{
    int i,j,n,t,p[max],bt[max],pr[max],wt[max],tat[max],Total_wt=0,Total_tat=0;
float awt=0,atat=0;
printf("Enter the number of processes\n");
scanf("%d",&n);
//Enter the processes according to their arrival times
for(i=0;i<n;i++)
{
 printf("Enter the process number\n");
 scanf("%d",&p[i]); 
printf("Enter the burst time of the process\n");
 scanf("%d",&bt[i]); 
printf("Enter the priority of the process\n");
 scanf("%d",&pr[i]);
}
//Apply the bubble sort technique to sort the processes according to their priorities times
for(i=0;i<n;i++)
{
 for(j=0;j<n-i-1;j++)
 {
  if(pr[j]>pr[j+1])
  {
  // Sort according to priorities 
t=pr[j];
  pr[j]=pr[j+1];
  pr[j+1]=t; 

  // Sorting burst times
t=bt[j]; 
  bt[j]=bt[j+1];
  bt[j+1]=t; 
// Sorting Process numbers
  t=p[j];
  p[j]=p[j+1];
  p[j+1]=t;
  } //if
 } //for
} //for
printf("Processid \t Burst Time\t Priority\tWaiting Time\t Turn Around Time\n");
for(i=0;i<n;i++)
{
 wt[i]=0;
 tat[i]=0;
 for(j=0;j<i;j++)
  wt[i]=wt[i]+bt[j];
 tat[i]=wt[i]+bt[i];
 Total_wt=Total_wt+wt[i];
 Total_tat=Total_tat+tat[i];
 printf("%d\t\t %d\t\t%d\t\t %d\t\t %d\n",p[i],bt[i],pr[i],wt[i],tat[i]);
}
awt=(float)Total_wt/n;
atat=(float)Total_tat/n;
printf("The average waiting time =  %f\n",awt);
printf("The average turn aroud time = %f\n",atat);
}
by

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Read inputs from stdin

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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;
    
}

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
}