Question

"

Number Guessing Game

You should think of a number between 1 and 100. Then, over and over again, the computer can suggest an answer. Your response to the computer guess will be as following:

1. If that answer is too small, you enter the character '>'.
2. If the computer's answer is too large, you enter the character '<'.
3. If the computer's answer is just right, you enter '='

Requirements:

• Your code should show the number of time the computer needed to guess the correct number
• Make sure your code looks nice
• Make sure to write comments to explain how your algorithm works
• Please upload code + screenshot of the output

Hints:

• There are multiple ways for the computer to find the number, there are a slow algorithm and a faster algorithm (If you use the faster algorithm you will get a full mark)
• Finding a middle point always helps

Have fun!

"

Here is what I have so far:

/*
Input: <, >, and =.
Output: Number.
Description: This code will guess your number in 7 moves or less.
Language: C
*/

#include <stdlib.h>
#include <stdio.h>

void main(void)
{
int mid = 50;
int max = 100;
int min = 1;
char ans;
char small = '>';
char large = '<';
char right = '=';
int i = 0;

printf("Choose a number between 1 to 100. I can guess your number in 7 moves or less\n");
printf("Is your number 50?\n");
printf("[>] If answer is too small.\n");
printf("[<] If answer is too large.\n");
printf("[=] If answer is just right.\n");
scanf(" %c", &ans);
while(ans != right)
{
if(ans == large)
{
printf(" Is your number %d?\n", mid/2);
max = mid + 1;
mid = (min+max)/2;
scanf(" %c", &ans);
i++;
}
if(ans == small)
{
printf(" Is your number %d?\n", (mid + max)/2);
min = mid - 1;
mid = (mid + max)/2;
scanf(" %c", &ans);
i++;
}
}
if(ans == right)
{
printf("Yay! I choose your answer in %d moves\n", i);
exit(0);
}
}

-------------------------------------------------

Currently, it works if the number is less than 50 but breaks when the number is higher than 50. I am pretty sure the math part is wrong but I don't know how to fix it.

Answer 1

CODE:-

#include <stdlib.h>
#include <stdio.h>

void main(void)
{
int mid = 50;
int max = 100;
int min = 1;
char ans;
char small = '>';
char large = '<';
char right = '=';
int i = 1;/*here it must be 1 because suppose number guessed was actually 50 then
it shows that number of moves was 0 which is incorrect because it does have make a move
by comparing guessed number to 50*/

printf("Choose a number between 1 to 100. I can guess your number in 7 moves or less\n");
printf("Is your number 50?\n");
printf("[>] If answer is too small.\n");
printf("[<] If answer is too large.\n");
printf("[=] If answer is just right.\n");
scanf(" %c", &ans);
while(ans != right)
{
if(ans == large)
{
max = mid-1;/* here first we need to change max value as mid is too large
so , we need to change max to number immediate smaller than mid*/
mid = (max+min)/2;/*now, change mid according to new max value .
add max and min and divide it by 2 and then take its floor value*/
printf(" Is your number %d?\n", mid);
scanf(" %c", &ans);
i++;
}
if(ans == small)
{
min = mid+1;/* here first we need to change min value as mid is too small
so , we need to change min to number immediate bigger than mid*/
mid = (min+max)/2;/*now, change mid according to new max value .
add max and min and divide it by 2 and then take its floor value*/
printf(" Is your number %d?\n", mid);

scanf(" %c", &ans);
i++;
}
}
if(ans == right)
{
printf("Yay! I choose your answer in %d moves\n", i);
exit(0);
}
}

output:-

When guessed number is larger than 50

when guessed number is smaller than 50

CODE screenshot:-