Question

Problem 2 Write a Hexadecimal to Decimal converter. Program will take an input (hexadecimal number) from user and display its corresponding decimal number, as an output, on the screen. Moreover, after you're done with one conversion, ask for another input in an infinite loop fashion, link to online Hexadecimal to Decimal converter: https://www.binaryhexconverter.com/hex-to-decimal-converter 50 point
c programming

Answer 1

Here is the solution to above problem in C. Please read the code comments for more information and Please give a thumbs up if you like the solution

C CODE

#include <stdio.h>
#include<string.h>
#include<math.h>

void convert()
{
// taking input for hexadecimal number as string
printf("Enter hexadecimal number: ");
char s[1000];
scanf("%s",s);
//length of input
int len = strlen(s);
int i=len-1;
//declaring long variable to calculate the total
long total=0;
//to calculate the exponent
int c=0;
//iterating all characters in the input string
// the value of hexadecimal is calculated as
// AEFF = 10 * 16^3 + 14*16^2 + 15*16^1+ 15*16^0
while(i>=0)
{
  
if(s[i]=='F')
{
  
total+=15*pow(16,c);
}
else if(s[i]=='E')
{
total+=14*pow(16,c);
}
else if(s[i]=='D')
{
total+=13*pow(16,c);
}
else if(s[i]=='C')
{
total+=12*pow(16,c);
}
else if(s[i]=='B')
{
total+=11*pow(16,c);
}
else if(s[i]=='A')
{
total+=10*pow(16,c);
}
else if(s[i]-'0'>=0)
{
total+=(s[i]-'0')*pow(16,c);
}
i--;
c++;
}
  
printf("Decimal number to %s hexadecimal number is %ld\n", s, total);
}
int main()
{
printf("HEXADECIMAL TO DECIMAL CONVERTOR\n");
//menu driven program which runs till user exits the program
int option;
while(option!=2)
{
printf("---------MENU-----------\n");
printf("1. CONVERT A NUMBER: \n");
printf("2. EXIT\n");
printf("Enter your choice: ");
scanf("%d",&option);
switch(option)
{
  
case 1:
{
// method to convert hexadecimal to decimal
convert();
}
break;
case 2:
break;
default:
printf("Enter correct choice:\n");
}
  
}

return 0;
}

SCREENSHOT OF CODE

HEXADECIMAL TO DECIMAL CONVERTOR ---------MENU---- 1. CONVERT A NUMBER: 2. EXIT Enter your choice: 1 Enter hexadecimal number: AA3EF Decimal number to AA3EF hexadecimal number is 697327 ---------MENU----------- 1. CONVERT A NUMBER: 2. EXIT Enter your choice: 1 Enter hexadecimal number: AEFF Decimal number to AEFF hexadecimal number is 44799 ---------MENU----------- 1. CONVERT A NUMBER: 2. EXIT Enter your choice: