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RAILWAY RESERVATION SYSTEM

DATA FLOW DIAGRAM

Data Flow Diagram (DFD) is used widely for modelingthe requirement.

They have been used for many yearsprior to the advent of computer. DFDs show the flow of data through the system.

The system may be a company,an organization, a set of procedural, a computer hardwaresystem, a software system, or any combination of thepreceding.

Case diagram

Level 1 Data Flow Diagram :-

1. Multiply the numbers in your data set by the weights.
2. Add the numbers in Step 1 up. Set this number aside for a moment.
3. Add up all of the weights.
4. Divide the numbers you found in Step 2 by the number you found in Step 3.

• All the probabilities must be between 0 and 1 inclusive
• The sum of the probabilities of the outcomes must be 1.

What’s even better, is that the last portion of the variance is the mean squared. So, the two formulas that we will be using are:

1. i) Determine the two equations of regression
2. ii) Calculate the expected marks in A corresponding to 75 marks obtained in B

1. #include <stdio.h>
2. #include <string.h>
3.  
4. void main()
5. {
6.     char string[25], reverse_string[25] = {'\0'};
7.     int i, length = 0, flag = 0;
8.  
9.     printf("Enter a string \n");
        gets(string);
    /*  keep going through each character of the string till its end */
   for (i = 0; string[i] != '\0'; i++)
    {
        length++;
    }
    printf("The length of the string '%s' = %d\n", string, length);
    for (i = length - 1; i >= 0 ; i--)
    {
        reverse_string[length - i - 1] = string[i];
    }
   /*  Check if the string is a Palindrome */
    for (flag = 1, i = 0; i < length ; i++)
    {
        if (reverse_string[i] != string[i])
            flag = 0;

    }
    if (flag == 1)
       printf ("%s is a palindrome \n", string);
    else
       printf("%s is not a palindrome \n", string);
}

Enter a string
  how  are you
The length of the string 'how  are you' = 12
how  are you is not a palindrome
-------------------------------------------------------------------
 Enter a string
   madam
 The length of the string 'madam' = 5
 madam is a palindrome

step 1 : start

step 2 : Declare variables char_string[25], reverse_string[25]
                    int i, length = 0, flag = 0;

step 3 : read value string.

step 4 : for (i = 0; string[i] != '\0'; i++)
         length++
step 5 : display 'the length of string =', string, length

step 6 : for (i = length - 1; i >= 0 ; i--)
        do reverse_string[length - i - 1] = string[i]
          /*  Check if the string is a Palindrome */

step 7 : for (flag = 1, i = 0; i < length ; i++)
                  if revers_string[i] ! = string[i]
                           do flag = 0
                        if flag == 1
                         display string is palindrome.
                         else 
                         display string is not palindrome.

step 8 : stop.

#include <stdio.h>
int main() {

    int i,n, count = 0;
    float arr[100];
    printf("Enter total number of elements(1 to 100): ");
    scanf("%d",&n);
    printf("\n");
    for(i=0;i<n;++i)  /* Stores number entered by user. */
    {
       printf("Enter Number %d: ",i+1);
       scanf("%f",&arr[i]);
    }

    for(i=1;i<n;++i)  /* Loop to store largest number to arr[0] */
    {
       if(arr[0]<arr[i]) /* Change < to > if you want to find smallest element*/
       {       
       count++;
       }
           arr[0]=arr[i];
    }
    printf("Largest element = %.2f \n",arr[0]);
    printf(“the number of comparison %d”, count);    
    return 0;
       getch();
}

statement;

for(i=0; i < N; i++)
              {
                     statement;
               }

for(i=0; i < N; i++)
    {
        for(j=0; j < N;j++)
            {
              statement;
             }
    }

#include <stdio.h>
#include <string.h> 
/* Function Prototype */

void swap(int*, int *);
void main()
{
    int num1, num2;
printf("\nEnter two numbers:");
scanf("%d %d", &num1, &num2);
printf("\nThe numbers before swapping are Number1= %d Number2 = %d", num1, num2);
swap(&num1, &num2);   /* Call by Reference to function swap */
printf("\nThe numbers after swapping are Number1= %d Number2 = %d", num1, num2);

}
/* Code to swap two numbers using Assignment operator */
void swap(int *x, int *y)
  {
    *x = *x ^= *y;
    *y = *y ^= *y;
    *x = *x ^= *y;
}

The minimum number of operator assigned is six because as we can see in the void swap function in that we used assignment operator six time to swap the value of num1 and num2.