Program of first come first serve(FCFS) in Operating Sysytem

Program of first come first serve(FCFS) in Operating Sysytem

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#include<stdio.h>
#include<conio.h>

void main()
{
        int a,n,i,j,pa[10],pb[10],pt[10],pc[10],pw[10],ptat[10],pa2[10];
        printf("Enter the no. of process");
        scanf("%d",&n);
        for(a=0;a<n;a++)
        {
                printf("Enter the arrival time and the cpu brust time of process %d\n",a+1);
                scanf("%d%d",&pa[a],&pb[a]);
                pc[a]=pb[a];
                pa2[a]=pa[a];
        }
        for(i=0;i<n;i++)
        {
                for(j=i;j<n;j++)
                {
                        if(pa[i]>pa[j])
                        {
                                a=pa[i];
                                pa[i]=pa[j];
                                pa[j]=a;
                                a=pb[i];
                                pb[i]=pb[j];
                                pb[j]=a;
                        }
                }
        }
        for(a=0;a<n;a++)
        {
                printf("\n%d\t%d",pa[a],pb[a]);
        }
        printf("\n");
        pt[0]=0;
        for(a=1;a<n;a++)
        {
                pt[a]=pt[a-1]+pb[a-1];

        }
        for(a=0;a<n;a++)
        {
                pw[a]=pt[a]-pa[a];
                ptat[a]=pw[a]+pb[a];
                //printf("\nWaiting Time %d\t %d",a+1,pw[a]);

        }
        for(i=0;i<n;i++)
        {
                for(j=0;j<n;j++)
                {
                        if(pb[j]==pc[i] && pa[j]==pa2[i])
                                printf("\nTAT%d \t %d",i+1,ptat[j]);
                }
        }
        printf("\n");
        i=0;
        for(a=0;a<n;a++)
        {
                i=i+ptat[a];
        }
        printf("\nTotal TAT = %d\nAverage TAT = %d",i,i/n);

        getch();
}

Program to check leap year.

Program to check leap year.

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Q. Write a program to check leap year.


#include <stdio.h>

int main()
{
  int year;

  printf("Enter a year to check if it is a leap year\n");
  scanf("%d", &year);

  if ( year%400 == 0)
    printf("%d is a leap year.\n", year);
  else if ( year%100 == 0)
    printf("%d is not a leap year.\n", year);
  else if ( year%4 == 0 )
    printf("%d is a leap year.\n", year);
  else
    printf("%d is not a leap year.\n", year);

  return 0;
}

C program to perform addition, subtraction, multiplication and division.

C program to perform addition, subtraction, multiplication and division.

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C program to perform basic arithmetic operations which are addition, subtraction, multiplication and division of two numbers. Numbers are assumed to be integers and will be entered by the user.

#include <stdio.h>
 
int main()
{
   int first, second, add, subtract, multiply;
   float divide;
 
   printf("Enter two integers\n");
   scanf("%d%d", &first, &second);
 
   add        = first + second;
   subtract = first - second;
   multiply = first * second;
   divide     = first / (float)second;   //typecasting
 
   printf("Sum = %d\n",add);
   printf("Difference = %d\n",subtract);
   printf("Multiplication = %d\n",multiply);
   printf("Division = %.2f\n",divide);
 
   return 0;
}




In c language when we divide two integers we get integer result for example 5/2 evaluates to 2. As a general rule integer/integer = integer and float/integer = float or integer/float = float. So we convert denominator to float in our program, you may also write float in numerator. This explicit conversion is known as typecasting.

C Program to check whether the No. is Odd or Even.

C Program to check whether the No. is Odd or Even.

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Hello friends in this program we will determine whether the no is even or odd using C code. As you have study in mathematics that in decimal number system even numbers are divisible by 2 while odd are not so we may use modulus operator(%) which returns remainder, For example 4%3 gives 1 ( remainder when four is divided by three). Even numbers are of the form 2*p and odd are of the form (2*p+1) where p is is an integer.


#include<stdio.h>
#include<conio.h>

void main()
{
int n;
clrscr();
printf("Enter a no. \n");
scanf("%d",&n);
if(n%2==0)
printf("No. is even.\n");
else
printf("No. is odd\n");
getch();
}

C program to add two int numbers.

C program to add two int numbers.

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In this program we can add two integer values. Given by the user.

#include<stdio.h>

#include<conio.h>

void main()

{

int a,b,c;

clrscr();

printf("Enter two noumbers : \n");

scanf("%d %d",&a,&b);

c=a+b;

printf("addition is %d \n",c);

getch();

}

C program to Input and print a "String"

C program to Input and print a "String"

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In this program you can input a string and print it on the screen.


#include<stdio.h>
#include<conio.h>

void main()
{
char str[100] ={'p','c','w','o','r','l','d','l','i','f','e'};
clrscr();
printf("\n%s\n",str);
getch();
printf("Enter a string\n");
scanf("%s",str);
printf("\nEntered string is\n%s \n",str);
getch();
}

C program to take input and print the value of a Int And Float.

C program to take input and print the value of a Int And Float.

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In this program you will learn about to take input to the variables and print their values. The values are depends on the input .

#include<stdio.h>

#include<conio.h>

void main()

{

int a;

float c;

clrscr();                                            //to clear the screen.

printf("Enter the value of int\n");   //\n is used for new line

scanf("%d",&a);

printf("\na = %d",a);                      //& is used to store the value at the location of a, %d for int.

printf("\n\nEnter the value of float\n");

scanf("%f",&c);

printf("\nc = %f",c);

getch();

}