#include <stdio.h>

int main()

{

int j;

printf("enter a number of reference string");

scanf("%d",&j);



int incomingStream[j];

printf("enter a reference string");

for(int i=0;i<j;i++)

{

scanf("%d",&incomingStream[i]);

}

int pageFaults = 0;

int frames ;

printf("enter a number of franmes");

scanf("%d",&frames);

int m, n, s, pages;

pages = sizeof(incomingStream)/sizeof(incomingStream[0]);

printf("Incoming \t Frame 1 \t Frame 2 \t Frame 3");

int temp[frames];

for(m = 0; m < frames; m++)

{

    temp[m] = -1;

}

for(m = 0; m < pages; m++)

{

    s = 0;

    for(n = 0; n < frames; n++)

    {

        if(incomingStream[m] == temp[n])

        {

            s++;

            pageFaults--;

        }

    }

    pageFaults++;

    

    if((pageFaults <= frames) && (s == 0))

    {

        temp[m] = incomingStream[m];

    }

    else if(s == 0)

    {

        temp[(pageFaults - 1) % frames] = incomingStream[m];

    }

  

    printf("\n");

    printf("%d\t\t\t",incomingStream[m]);

    for(n = 0; n < frames; n++)

    {

        if(temp[n] != -1)

            printf(" %d\t\t\t", temp[n]);

        else

            printf(" - \t\t\t");

    }

}


printf("\nTotal Page Faults:\t%d\n", pageFaults);

int hit;

hit=j-pageFaults;

printf(" hits are %d\n",hit);

printf("the fault ratio is %d/%d\n",pageFaults,j);

printf("the hit ratio is %d/%d\n ",hit,j);



return 0;
}

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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
}