IP address program

Really short C program to print out your ip address. Run it as an .exe. 

#include<stdlib.h>

main()
{
system("C:\\Windows\\System32\\ipconfig");
}

Decimal to Binary Program

Simple program to Convert a decimal number to binary. If you have doubts, let me know

#include <stdio.h>
main()
{
int num,count,temp;
printf("Enter the number");
scanf("%d",&num);
for(count=31;count>= 0;count--)
{
temp=num>>count;
if(temp&1)
printf("1");
else
printf("0");
}
}

Program to copy a file

C program to copy file. If you have any doubts, let me know

#include <stdlib.h>

#include <stdio.h>
main()
{
   
FILE *source, *target;

char x, sourcef[100], targetf[100];
   printf("File to copy?");
     gets(sourcef);
   source=fopen(sourcef, "r"); 
   printf("Target File?");
      gets(targetf);
   target=fopen(targetf, "w");
       while((x=fgetc(source))!=EOF)
           fputc(x, target);
  printf("The file has been copied.");
}

Program to read from file

Program to read from a file. If you have any doubts, let me know


#include <stdlib.h>


#include <stdio.h>

main()
{
char x, name[100];
FILE *pf;
    printf("Name of file?");
    gets(name);
    pf = fopen(name,"r");
    printf("Contents are :");
         while((x=fgetc(pf))!= EOF)
         printf("%c",x);
    }

Program to find twin prime numbers.

Program to find twin prime numbers. Please comment if you need help.

#include<stdio.h>
void main( )
{
int  i,n,k,r,a[50],p;
printf("nEnter the range:  ");
scanf("%d", &r);
i=1;
p=0;
while(i<=r)
{
k=0;
n=1;
while(n<=i)
{
if( i%n==0 )
k++;
n++;
}
if(k==2)
{
a[p]=i;
p++;
}
i++;
}
for(n=0;n<p;n++)
{
if(a[n+1] - a[n]==2)
printf("\n%d and %d are twin primes", a[n], a[n+1]);
}
}

Program to implement Fibonacci series

Program to implement Fibonacci series. Comment if you need any help.

#include<stdio.h>

int fibo(int x);

main()

{

int n,i,ar[50];

printf("\n  enter the number of terms:");

scanf("%d",&n);

ar[0]=0;

for(i=1;i<n;i++)

{

ar[i]=fibo(i);

}

printf("\n");

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

printf("%d ",ar[i]);

printf("\n");

}

int fibo(int c)

{

int fib=0;

if((c==1)||(c==2))

return 1;

else

{

fib=fibo(c-1)+fibo(c-2);

return fib;

}

}

Program to write to a file and display the vowel which occurred the most

Program to write to a file and display the vowel which occurred the most often. If you need help comment below

#include<stdio.h>

main()

{

  FILE *f1;

  char c;

  int a,e,i,o,u;

  a=0;

  e=0;

  i=0;

  u=0;

  o=0;

  printf("\nEnter the letters to the file:\n");

  f1=fopen("TEXT.txt","w");

  while((c=getchar())!='\n')

    putc(c,f1);

  fclose(f1);

  f1=fopen("TEXT.txt","r");

  while((c=getc(f1))!=EOF)

   {

     if(c=='a')

       a++;

     else if(c=='e')

       e++;

     else if(c=='i')

       i++;

     else if(c=='o')

       o++;

     else if(c=='u')

       u++;

   }

  fclose(f1);

  if((a>=e)&&(a>=i)&&(a>=o)&&(a>=u))

   printf("\n\n'a'is the vowel which occured the most.\n%d times",a);

  if((e>=a)&&(e>=i)&&(e>=u)&&(e>=o))

   printf("\n\n'e' is the vowel which occured the most.\n%d times",e);

  if((i>=a)&&(i>=e)&&(i>=o)&&(i>=u))

   printf("\n\n'i' is the vowel which occured the most.\n%d times",i);

  if((o>=a)&&(o>=e)&&(o>=i)&&(o>=u))

   printf("\n\n'o'is the vowel which occured the most.\n%d times",o);

  if((u>=a)&&(u>=e)&&(u>=i)&&(u>=o))

   printf("\n\n'u' is the vowel which occured the most.\n%d times",u);

  printf("\n\n");

}