#include <stdio.h>
int main()
{
  int pid[10]={0},bt[10]={0},at[10]={0},tat[10]={0},wt[10]={0},ct[10]={0};
int n,sum=0,temp,temp1,i,j,k,temp2;
float totalTAT=0,totalWT=0;
printf("Enter number of processes ");
scanf("%d",&n);
printf("Enter the processes details\n\n");
for(i=0;i<n;i++)
 {
  printf("Enter processid");
  scanf("%d",&pid[i]);
  printf("Arrival time of process[%d] ",i+1);
  scanf("%d",&at[i]);
  printf("Burst time of process[%d] ",i+1);
  scanf("%d",&bt[i]);
  printf("\n");
 }
for (i=0; i<n-1; i++)
{
for (j=0; j<n-i-1; j++)
 {
 if (at[j]>at[j+1])
  {
  temp = at[j];
  at[j] = at[j+1];
  at[j+1] = temp; 
  temp1 = bt[j];
  bt[j] = bt[j+1];
  bt[j+1] = temp1;
  temp2=pid[j];
  pid[j]=pid[j+1];
  pid[j+1]=temp2;
  }
 }
} 
 for(j=0;j<n;j++)
 {
  sum+=bt[j];
  ct[j]+=sum;
 }

 for(k=0;k<n;k++)
 {
  tat[k]=ct[k]-at[k];
  totalTAT+=tat[k];
 }

 wt[0]=0;
 for(k=0;k<n;k++)
 {
  wt[k]=0; 
    for(j=0;j<k;j++)
 wt[k]+=bt[j];
  totalWT+=wt[k];
 }

 printf("Solution: \n\n");
 printf("PID#\t AT\t BT\t CT\t TAT\t WT\t\n\n");
 for(i=0;i<n;i++)
 {
  printf("P%d\t %d\t %d\t %d\t %d\t %d\n",pid[i],at[i],bt[i],ct[i],tat[i],wt[i]);
 }
 printf("\n\nAverage Turnaround Time = %f\n",totalTAT/n);
 printf("\nAverage Waiting Time = %f\n\n",totalWT/n);
 return 0;
}
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#include <stdio.h>
int main()
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    char name[50];
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    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
}