program to copy files in c language

#include <stdio.h>
#include <stdlib.h>
 
int main()
{
   char ch, source_file[20], target_file[20];
   FILE *source, *target;
 
   printf("Enter name of file to copy\n");
   gets(source_file);
 
   source = fopen(source_file, "r");
 
   if( source == NULL )
   {
      printf("Press any key to exit...\n");
      exit(EXIT_FAILURE);
   }
 
   printf("Enter name of target file\n");
   gets(target_file);
 
   target = fopen(target_file, "w");
 
   if( target == NULL )
   {
      fclose(source);
      printf("Press any key to exit...\n");
      exit(EXIT_FAILURE);
   }
 
   while( ( ch = fgetc(source) ) != EOF )
      fputc(ch, target);
 
   printf("File copied successfully.\n");
 
   fclose(source);
   fclose(target);
 
   return 0;
}

program to swap two strings in c language

#include <stdio.h>
#include <string.h>
#include <malloc.h>
 
int main()
{
   char first[100], second[100], *temp;
 
   printf("Enter the first string\n");
   gets(first);
 
   printf("Enter the second string\n");
   gets(second);
 
   printf("\nBefore Swapping\n");
   printf("First string: %s\n",first);
   printf("Second string: %s\n\n",second);
 
   temp = (char*)malloc(100);
 
   strcpy(temp,first);
   strcpy(first,second);
   strcpy(second,temp);
 
   printf("After Swapping\n");
   printf("First string: %s\n",first);
   printf("Second string: %s\n",second);
 
   return 0;
}

program to print Pascal triangle in c language

#include <stdio.h>
 
long factorial(int);
 
int main()
{
   int i, n, c;
 
   printf("Enter the number of rows you wish to see in pascal triangle\n");
   scanf("%d",&n);
 
   for ( i = 0 ; i < n ; i++ )
   {
      for ( c = 0 ; c <= ( n - i - 2 ) ; c++ )
         printf(" ");
 
      for( c = 0 ; c <= i ; c++ )
         printf("%ld ",factorial(i)/(factorial(c)*factorial(i-c)));
 
      printf("\n");
   }
 
   return 0;
}
 
long factorial(int n)
{
   int c;
   long result = 1;
 
   for( c = 1 ; c <= n ; c++ )
         result = result*c;
 
   return ( result );
}

program to generate and print armstrong numbers in c language

#include <stdio.h>
 
int main()
{
   int r;
   long number = 0, c, sum = 0, temp;
 
   printf("Enter an integer upto which you want to find armstrong numbers\n");
   scanf("%ld",&number);
 
   printf("Following armstrong numbers are found from 1 to %ld\n",number);
 
   for( c = 1 ; c <= number ; c++ )
   {
      temp = c;
      while( temp != 0 )
      {
         r = temp%10;
         sum = sum + r*r*r;
         temp = temp/10;
      }
      if ( c == sum )
         printf("%ld\n", c);
      sum = 0;
   }
 
   return 0;
}

program to reverse a number in c language

 
#include <stdio.h>
 
int main()
{
   int n, reverse = 0;
 
   printf("Enter a number to reverse\n");
   scanf("%d",&n);
 
   while (n != 0)
   {
      reverse = reverse * 10;
      reverse = reverse + n%10;
      n = n/10;
   }
 
   printf("Reverse of entered number is = %d\n", reverse);
 
   return 0;
}

program to add two numbers in c language

#include<stdio.h>
 
int main()
{
   int a, b, c;
 
   printf("Enter two numbers to add\n");
   scanf("%d%d",&a,&b);
 
   c = a + b;
 
   printf("Sum of entered numbers = %d\n",c);
 
   return 0;
}

program for prime number in c language

#include<stdio.h>
 
int main()
{
   int n, i = 3, count, c;
 
   printf("Enter the number of prime numbers required\n");
   scanf("%d",&n);
 
   if ( n >= 1 )
   {
      printf("First %d prime numbers are :\n",n);
      printf("2\n");
   }
 
   for ( count = 2 ; count <= n ;  )
   {
      for ( c = 2 ; c <= i - 1 ; c++ )
      {
         if ( i%c == 0 )
            break;
      }
      if ( c == i )
      {
         printf("%d\n",i);
         count++;
      }
      i++;
   }
 
   return 0;
}

Factorial program using for loop in c language

#include <stdio.h>
 
int main()
{
  int c, n, fact = 1;
 
  printf("Enter a number to calculate it's factorial\n");
  scanf("%d", &n);
 
  for (c = 1; c <= n; c++)
    fact = fact * c;
 
  printf("Factorial of %d = %d\n", n, fact);
 
  return 0;
}

program to find hcf and lcm using function in c language

#include <stdio.h>
 
long gcd(long, long);
 
int main() {
  long x, y, hcf, lcm;
 
  printf("Enter two integers\n");
  scanf("%ld%ld", &x, &y);
 
  hcf = gcd(x, y);
  lcm = (x*y)/hcf;
 
  printf("Greatest common divisor of %ld and %ld = %ld\n", x, y, hcf);
  printf("Least common multiple of %ld and %ld = %ld\n", x, y, lcm);
 
  return 0;
}
 
long gcd(long x, long y) {
  if (x == 0) {
    return y;
  }
 
  while (y != 0) {
    if (x > y) {
      x = x - y;
    }
    else {
      y = y - x;
    }
  }
 
  return x;
}

program to find hcf and lcm using recursion in c language

#include <stdio.h>
 
long gcd(long, long);
 
int main() {
  long x, y, hcf, lcm;
 
  printf("Enter two integers\n");
  scanf("%ld%ld", &x, &y);
 
  hcf = gcd(x, y);
  lcm = (x*y)/hcf;
 
  printf("Greatest common divisor of %ld and %ld = %ld\n", x, y, hcf);
  printf("Least common multiple of %ld and %ld = %ld\n", x, y, lcm);
 
  return 0;
}
 
long gcd(long a, long b) {
  if (b == 0) {
    return a;
  }
  else {
    return gcd(b, a % b);
  }
}

program to find hcf and lcm in c language

#include <stdio.h>
 
int main() {
  int a, b, x, y, t, gcd, lcm;
 
  printf("Enter two integers\n");
  scanf("%d%d", &x, &y);
 
  a = x;
  b = y;
 
  while (b != 0) {
    t = b;
    b = a % b;
    a = t;
  }
 
  gcd = a;
  lcm = (x*y)/gcd;
 
  printf("Greatest common divisor of %d and %d = %d\n", x, y, gcd);
  printf("Least common multiple of %d and %d = %d\n", x, y, lcm);
 
  return 0;
}

Program to reverse a sentence using recursion in c

Program to reverse a sentence using recursion


#include <stdio.h> void Reverse(); int main() { printf("Enter a sentence: "); Reverse(); return 0; } void Reverse() { char c; scanf("%c",&c); if( c != '\n') { Reverse(); printf("%c",c); } }

Program to find greatest number in c

Program to find greatest number in c

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

void main()
{
int a,b,c;
clrscr();

printf("nEnter value of a, b & c: ");
scanf("%d %d %d",&a,&b,&c);

if((a>b)&&(a>c))
    printf("na is greatest");

if((b>c)&&(b>a))
    printf("nb is greatest");

if((c>a)&&(c>b))
    printf("nc is greatest");

getch();
}

Program to implement insertion sort algorithm in c

Program to implement insertion sort algorithm in c

#include <stdio.h>
 
int main()
{
  int n, array[1000], c, d, t;
 
  printf("Enter number of elements\n");
  scanf("%d", &n);
 
  printf("Enter %d integers\n", n);
 
  for (c = 0; c < n; c++) {
    scanf("%d", &array[c]);
  }
 
  for (c = 1 ; c <= n - 1; c++) {
    d = c;
 
    while ( d > 0 && array[d] < array[d-1]) {
      t          = array[d];
      array[d]   = array[d-1];
      array[d-1] = t;
 
      d--;
    }
  }
 
  printf("Sorted list in ascending order:\n");
 
  for (c = 0; c <= n - 1; c++) {
    printf("%d\n", array[c]);
  }
 
  return 0;
}

Program to implement selection sort in c

#include <stdio.h>
 
int main()
{
   int array[100], n, c, d, position, swap;
 
   printf("Enter number of elements\n");
   scanf("%d", &n);
 
   printf("Enter %d integers\n", n);
 
   for ( c = 0 ; c < n ; c++ )
      scanf("%d", &array[c]);
 
   for ( c = 0 ; c < ( n - 1 ) ; c++ )
   {
      position = c;
 
      for ( d = c + 1 ; d < n ; d++ )
      {
         if ( array[position] > array[d] )
            position = d;
      }
      if ( position != c )
      {
         swap = array[c];
         array[c] = array[position];
         array[position] = swap;
      }
   }
 
   printf("Sorted list in ascending order:\n");
 
   for ( c = 0 ; c < n ; c++ )
      printf("%d\n", array[c]);
 
   return 0;
}

Program to check whether a number is palindrome or not

Program to check whether a number is palindrome or not


#include <stdio.h> int main() { int n, reverse=0, rem,temp; printf("Enter an integer: "); scanf("%d", &n); temp=n; while(temp!=0) { rem=temp%10; reverse=reverse*10+rem; temp/=10; } /* Checking if number entered by user and it's reverse number is equal. */ if(reverse==n) printf("%d is a palindrome.",n); else printf("%d is not a palindrome.",n); return 0; }

PROGRAM TO CHECK THE NUMBER IS ARMSTONG NO. OR NOT

PROGRAM TO CHECK THE NUMBER IS ARMSTONG NO. OR NOT


#include <stdio.h> int main() { int n, n1, rem, num=0; printf("Enter a positive integer: "); scanf("%d", &n); n1=n; while(n1!=0) { rem=n1%10; num+=rem*rem*rem; n1/=10; } if(num==n) printf("%d is an Armstrong number.",n); else printf("%d is not an Armstrong number.",n); }