C language basic to Advance - آمار و تحلیل کانال تلگرام @c_codes

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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

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/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;
}

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/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; }

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// 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;
}

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/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; }

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/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; }

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/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; }

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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.`

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// 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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/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; }

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/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; }

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// 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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/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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