1) Base of hexadecimal number system? Answer : 16 2) Universal gate in digital logic? Answer : NAND 3) Memory type that is non-volatile? Answer : ROM 4) Basic building block of digital circuits? Answer : Gate 5) Device used for data storage in sequential circuits? Answer : Flip-flop 6) Architecture with shared memory for instructions and data? Answer : von Neumann 7) The smallest unit of data in computing? Answer : Bit 8) Unit that performs arithmetic operations in a CPU? Answer : ALU 9) Memory faster than main memory but smaller in size? Answer : Cache 10) System cycle that includes fetch, decode, and execute? Answer : Instruction 11) Type of circuit where output depends on present input only? Answer : Combinational 12) The binary equivalent of decimal 10? Answer : 1010 13) Memory used for high-speed temporary storage in a CPU? Answer : Register 14) Method of representing negative numbers in binary? Answer : Two's complement 15) Gate that inverts its input signal? Answer : NOT 16)...
C program to find sum of digits of a number using recursion.
int sumOfDigits(int num);
int main() {
int num, sum;
printf("Enter a number: ");
scanf("%d", &num);
sum = sumOfDigits(num);
printf("The sum of digits of %d is %d.\n", num, sum);
return 0;
}
int sumOfDigits(int num) {
if (num == 0) {
return 0;
} else {
return (num % 10) + sumOfDigits(num / 10);
}
}
Explanation :
The program starts by including the standard input-output library stdio.h.
The program defines a function sumOfDigits that takes an integer argument num and returns the sum of its digits. The function is defined using recursion.
Inside the sumOfDigits function, there is an if statement that checks if the number num is equal to 0. If it is, the function returns 0 as the sum of digits.
If num is not equal to 0, the function calculates the sum of the last digit of num (obtained using the modulus operator %) and the sum of digits of the remaining digits (obtained using integer division /), and returns this sum.
The program defines the main function that takes no arguments and returns an integer. Inside the main function, the program declares three integer variables num, sum, and i.
The program prompts the user to enter a number using printf and reads the input using scanf.
The program calls the sumOfDigits function with the input number num and stores the result in the variable sum.
Finally, the program prints the result using printf.
The return 0 statement at the end of the main function terminates the program and returns 0 to the operating system.
Sample output :
Enter a number: 1234
The sum of digits of 1234 is 10.
Here, we have entered the number 1234 as input, and the program has calculated the sum of its digits (which is 1+2+3+4=10) using recursion and printed the result.