Question

You must write a C program that prompts the user for two numbers (no command line input) and multiplies them together using “a la russe” multiplication. The program must display your banner logo as part of a prompt to the user. The valid range of values is 0 to 6000. You may assume that the user will always enter numerical decimal format values. Your program should check this numerical range (including checking for negative numbers) and reprompt the user for correct input if necessary. The program must require the user to enter a specific character to exit the program and return back to the terminal prompt. The program should print the result in decimal format and binary format. The binary output should use the least number of bits to display the number in multiples of 8 bits. I.e., anything less than 256 should display as 8 bits, anything less than 64k should use 16 bits, etc. The value 6000 times 6000 should need 32 bits. • You may NOT use any libraries other than stdio.h • You may NOT use the multiplication operator or the division operator o Use bitwise shifting to halve and double numbers o Use modulus to detect if a value is even or odd • You must use two source files o One source file will contain the main() function, global variables, and proper function prototypes. o The other source file will contain all other functions as specified below o The program must be built using the compile command like Tutorials Point (pdf p27 – end of Chapter 8) • You must have at least the following four functions in addition to main o One function that prints your logo banner o One function that takes in a value and prints it in binary format o One function that prompts the user for input and qualifies those values o One function that takes in the two values, multiplies them and returns the result. • Your program must keep the two input values and the result in global variables • There can be no “magic numbers” in the code o Any constants must be defined with a Macro

Answer 1

C Program :

#include <stdio.h>
#include <stdint.h>

int alarusse_multiplication(int,int);

int main(void){
int run = 1;
int choice;
int multiplicand = 1;
int multiplier = 1;
int result = 1;
printf("|-------------------------------------------------|\r\n");
printf("|-------------Multiplication Program---------------|\r\n");
printf("|-------------------------------------------------|\r\n");
  
while(run){
printf(" 1. For Multiplication \r\n 2. For Exit \r\n Enter Choice:\r\n ");
fflush(stdin);
scanf("%d",&choice);
switch(choice){
case 1:
printf(" Enter multiplicand between 0 to 6000 \r\n ");
fflush(stdin);
scanf("%d",&multiplicand);
printf("Enter multiplier between 0 to 6000 \r\n ");
fflush(stdin);
scanf("%d",&multiplier);
result = alarusse_multiplication(multiplicand,multiplier);
printf("Result is %d \r\n ",result);
break;
case 2 :
run = 0;
printf("Exit...!! Good Bye!!\r\n");
break;
default:
printf("Error !! Invalid Options\r\n");
break;
}
}
return 0;
}

int alarusse_multiplication(int m,int n){
int result = 0;
  
if(n > m){
int temp = 0;
temp = m;
m = n;
n = temp;
}
  
while(n > 0)
{
if(n % 2 != 0)
{
result += m;
}
m *= 2; // double the first number   
n /= 2; // half the second number
}
  
  
return result;
}
Output:
|-------------------------------------------------|
|-------------Multiplication Program---------------|
|-------------------------------------------------|
1. For Multiplication
2. For Exit
Enter Choice:
1
Enter multiplicand between 0 to 6000
123
Enter multiplier between 0 to 6000
321
Result is 39483
1. For Multiplication
2. For Exit
Enter Choice:
2
Exit...!! Good Bye!!