C language basic to Advance

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// Decimal to Hexadecimal By C

#include<stdio.h>

int main()
{
    int rem,num,i=1,j;
    char Hexa[50];
     
    printf("Enter Decimal no: ");
    scanf("%d", &num);
    
    if(num!=0){
    while(num!=0){
    rem = num % 16;
    
    if(rem<10)
    rem=rem+48;
    
    else
    rem=rem+55;
    
    Hexa[i++]=rem;
    num=num/16;
    }}
    else{
    printf("0");
    }
    printf("\nHexadecimal Number is ");
    for(j=i;0<j;j--){
    printf("%c",Hexa[j]);
    }
    return 0;
} // @C_Codes_pro

/cc // Decimal to Hexadecimal By C #include<stdio.h> int main() {     int rem,num,i=1,j;     char Hexa[50];          printf("Enter Decimal no: ");     scanf("%d", &num);         if(num!=0){     while(num!=0){     rem = num % 16;         if(rem<10)     rem=rem+48;         else     rem=rem+55;         Hexa[i++]=rem;     num=num/16;     }}     else{     printf("0");     }     printf("\nHexadecimal Number is ");     for(j=i;0<j;j--){     printf("%c",Hexa[j]);     }     return 0; } // @C_Codes_pro

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//To check leap year

#include<stdio.h>
int main() {
    int year;
    printf("Enter a year that you want to check:");
    scanf("%d",&year);
    if((year%4==0 &&year%100!=0) ||( year%400==0))
        printf("%d is a leap year",year);
    else
        printf("%d is not a leap year",year);
    return 0;
}

/cc //To check leap year #include<stdio.h> int main() {     int year;     printf("Enter a year that you want to check:");     scanf("%d",&year);     if((year%4==0 &&year%100!=0) ||( year%400==0))         printf("%d is a leap year",year);     else         printf("%d is not a leap year",year);     return 0; }

// Dowhile loop to ask user for input until a valid number is entered:

#include <stdio.h>

int main() {
   int num;
   
   do {
      printf("Enter a number between 1 and 10: ");
      scanf("%d", &num);
   } while(num < 1 || num > 10);
   
   printf("You entered: %d", num);
   
   return 0;
}

/cc // Dowhile loop to ask user for input until a valid number is entered: #include <stdio.h> int main() {    int num;       do {       printf("Enter a number between 1 and 10: ");       scanf("%d", &num);    } while(num < 1 || num > 10);       printf("You entered: %d", num);       return 0; }

/cc // Do-while loop to ask user for input until a valid number is entered: #include <stdio.h> int main() {    int num;       do {       printf("Enter a number between 1 and 10: ");       scanf("%d", &num);    } while(num < 1 || num > 10);       printf("You entered: %d", num);       return 0; }

/cc // Do-while loop to ask user for input until a valid number is entered: #include <stdio.h> int main() {    int num;       do {       printf("Enter a number between 1 and 10: ");       scanf("%d", &num);    } while(num < 1 || num > 10);       printf("You entered: %d", num);       return 0; }

20 Questions on C loops:

`1. Write a C program to print all even numbers between 1 and 100 using a for loop.

2. Write a C program to calculate the sum of all odd numbers between 1 and 50 using a while loop.

3. Write a C program to print the multiplication table of a given number using a for loop.

4. Write a C program to find the factorial of a given number using a for loop.

5. Write a C program to check if a given number is prime or not using a for loop.

6. Write a C program to print the Fibonacci series up to a given number using a for loop.

7. Write a C program to find the sum of all elements in an array using a for loop.

8. Write a C program to find the largest element in an array using a for loop.

9. Write a C program to find the smallest element in an array using a for loop.

10. Write a C program to reverse an array using a for loop.

11. Write a C program to sort an array in ascending order using a for loop.

12. Write a C program to sort an array in descending order using a for loop.

13. Write a C program to find the sum of the digits of a given number using a while loop.

14. Write a C program to check if a given number is a palindrome or not using a while loop.

15. Write a C program to convert a decimal number to binary using a while loop.

16. Write a C program to convert a binary number to decimal using a while loop.

17. Write a C program to find the GCD of two numbers using a while loop.

18. Write a C program to find the LCM of two numbers using a while loop.

19. Write a C program to print all Armstrong numbers between 1 and 1000 using a for loop.

20. Write a C program to print all perfect numbers between 1 and 1000 using a for loop.`

// Recursion in C involves a function calling itself directly or indirectly. Here's an example of a recursive function in C:

#include <stdio.h>

void countdown(int n) {
    if (n > 0) {
        printf("%d ", n);      // Print the current number
        countdown(n - 1);     // Call the function itself with a smaller number
    }
}

int main() {
    int num = 5;
    countdown(num);
    return 0;
}

/cc // Recursion in C involves a function calling itself directly or indirectly. Here's an example of a recursive function in C: #include <stdio.h> void countdown(int n) {     if (n > 0) {         printf("%d ", n);      // Print the current number         countdown(n - 1);     // Call the function itself with a smaller number     } } int main() {     int num = 5;     countdown(num);     return 0; }

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//To check leap year #include<stdio.h> int main() {     int year;     printf("Enter a year that you want to check:");     scanf("%d",&year);     if((year%4==0 &&year%100!=0) ||( year%400==0))         printf("%d is a leap year",year);     else         printf("%d is not a leap year",year);     return 0; }

/cc //To check leap year #include<stdio.h> int main() {     int year;     printf("Enter a year that you want to check:");     scanf("%d",&year);     if((year%4==0 &&year%100!=0) ||( year%400==0))         printf("%d is a leap year",year);     else         printf("%d is not a leap year",year);     return 0; }

// Check Number #include <stdio.h> int main() {     int num;         printf("Enter Number: ");     scanf("%d", &num);         if(num>0){     printf("This Number is positive");     }     else if(num<0){     printf("This Number is negetive");     }     else if(num == 0){     printf("This Number is zero");     }         return 0; }

/cc // Check Number #include <stdio.h> int main() {     int num;         printf("Enter Number: ");     scanf("%d", &num);         if(num>0){     printf("This Number is positive");     }     else if(num<0){     printf("This Number is negetive");     }     else if(num == 0){     printf("This Number is zero");     }         return 0; }

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