Question

WRITE A PROGRAM IN C THAT DOES THE FOLLOWING

Read a floating point number without using scanf or conversion functions from the C library. You would need to write a utility function that processes console input using only getc and/or getchar and flow of control logic to process character-based input from the console to process the input.

Answer 1

Points to consider:

1. First, we need to take the integer input for the number of characters in the floating-point number.
2. Then we need to take input for that many numbers of characters.
3. Then we need to convert the characters into the floating-point number.

Code

#include<stdio.h>
#include<string.h>
int main()
{
   printf("Enter the number of characters in the floating point number: ");
   float result= 0.0f;
   int dotpos = 0;
   int len;
   int n;
   int dot_start = 0;
   int after_dot = 0;
   scanf("%d", &len);
   getchar();
   for (n = 0; n < len; n++) {
       char c = (char)getchar();
       if(dot_start == 1){
           after_dot += 1;
       }
       if (c == '.') {
           dotpos = len - n - 1;
           dot_start = 1;
       }
       else {
           result = result * 10 + (c-'0');
       }
      
         
   }
   result /= power(10,dotpos);
   printf("Converted to Floating Point number: %.*f", after_dot, result);
}

int power(int n,int m)
{
   if(m==1)
       return n;
   else
       return n*(power(n,m-1));
}

Output Snippet

That was a nice question to answer
Friend, If you have any doubts in understanding do let me know in the comment section. I will be happy to help you further.
Please like it if you think effort deserves like.
Thanks