#include <stdio.h>
int main(){
  int bt[20],p[20],wt[20],tat[20];
  int i,j,pos,temp,n;
  int totalwt=0,totaltat=0;
  float avgwt,avgtat;
  printf("Enter Number of processes \n");
  scanf("%d",&n);
  printf("Enter Burst Time: \n");
  for(i=0;i<n;i++){
    printf("Process %d: \n",i+1);
    scanf("%d",&bt[i]);
    p[i]=i+1;
  }
  for(i=0;i<n;i++){
    for(j=0;j<n-1;j++){
      if(bt[j]>bt[j+1]){
        temp=bt[j];
        bt[j]=bt[j+1];
        bt[j+1]=temp;
        temp=p[j];
        p[j]=p[j+1];
        p[j+1]=temp;
      }
    }
  }
  printf("Process \t burst time \t Waiting time \t Turnaround Time \n");
  for(i=0;i<n;i++){
    wt[i]=0;
    tat[i]=0;
    for(j=0;j<i;j++){
      wt[i]+=bt[j];
    }
    tat[i]=wt[i]+bt[i];
    totalwt+=wt[i];
    totaltat+=tat[i];
    printf("%d \t\t %d \t\t %d \t\t %d \n",p[i],bt[i],wt[i],tat[i]);
  }
  avgwt=(float)totalwt/n;
  avgtat=(float)totaltat/n;
  printf("Averge Waiting time : %f\n",avgwt);
  printf("Average time around time : %f", avgtat);
}
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
}