Basically I need to put correct numbers as input to get "exactly! Good job" answer! Need help to find what will be the inputs and why those inputs works!

Question

1.00/5 (1 vote)

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#include <stdio.h>
#include <inttypes.h>
#include <stdlib.h>
static int64_t metallica[] = { 32538, 37741, 89540, 14627, 34272, 58765 };
const static int N = sizeof(metallica)/sizeof(*metallica);
static void fail(){
 puts("Nope!");
 exit(EXIT_FAILURE);
}
static void the_beatles(int64_t h, int64_t s, int64_t i){
 if ( h - i / 7 + 3 * s / 11 )
 fail();
}
static void anthrax(int z, int64_t j){
 int64_t p = j;
 for(; z<N; ++z) {
 if ((z % 2) == 0)
 continue;
 p += metallica[z];
 }
 if (p != 69857)
 fail();
}
static void eagles(int k, int64_t d){
 if (k<N) {
 if (k % 2)
 eagles(++k, d);
 else eagles(k + 1, d * metallica[k]);
 } else if (d != 1269229500)
 fail();
}
int main(){
 int64_t a, e, y;
 printf("Please enter the right three numbers: ");
 fflush(stdout);
 if (scanf("%" SCNd64 " %" SCNd64 " %" SCNd64, &a, &e, &y) != 3)
 fail();
 metallica[0] = a;
 metallica[5] = e;
 metallica[4] = y;
 anthrax(0, 15916);
 eagles(1, 9);
 the_beatles(a, e, y);
 puts("Exactly! Good job.");
}

What I have tried:

Tried different inputs! All were integer. Executed those function separately to understand those function! but seems like I far away from the solution!

Posted 6-Mar-22 3:20am

boshir ahmed

Updated 6-Mar-22 8:09am

v3

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Richard MacCutchan 6-Mar-22 11:13am

You need to know which numbers are the correct ones.

3 solutions

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OriginalGriff · Answer 1 · 2022-03-06T05:36:00

In practice, you have two options:
1) Go and ask the person who wrote the code. This is the quick option ...
Or
2) Go with the slow option. You know what the end result must be: it's the value which doesn't make the code call fail. So start with the end - the the_beatles function and work out parameters which cause that to pass.
Then work back a step from that and work out what range of values will pass eagles

KarstenK · Answer 2 · 2022-03-06T07:13:00

As Eagles fan I give you some hints for a solution: rewrite the code to get it testable.
Change all function to give you some bool return code,

C++

static bool eagles(int k, int64_t d){
 if (k<N) {
 if (k % 2)
   return eagles(++k, d);
 else eagles(k + 1, d * metallica[k]);
 } else if (d != 1269229500)  { // some braces were missing here
 return false;
 }
 return true;
}

And rewrite the main with 3 for loops for a, e, y and let the computer do the job to run, til all return true. Make an output at end.

C++

if( anthrax(0, 15916) && eagles(1, 9) && the_beatles(a, e, y) ) {
// that is the case you are searching: make output to see the result
}

BTW: the eagles and anthrax input are constants. So they arent making much sense. Typo?

CPallini · Answer 3 · 2022-03-06T08:09:00

As Griff already suggested, you need to follow the code flow in order to discover what values are the good ones.
However, opposite to Griff, I suggest you to analyze the functions in the call order, i.e. anthrax, eagles, the_beatles.
Note: your task looks more tricky than it actual it is. For example let's consider the function anthrax

C

static void anthrax(int z, int64_t j){
 int64_t p = j;
 for(; z<N; ++z) {
 if ((z % 2) == 0)
 continue;
 p += metallica[z];
 }
 if (p != 69857)
 fail();
}

And its call in the main function

C

anthrax(0, 15916);

The function adds to 15916 all the odd items of the metallica array, namely

15916+37741+14627+e

and then checks if the sum is equal to 69857

Hence

e = 69857 - (15916+37741+14627) = 1573

is the only good value.

You can yourself find out the other values just making similar reasonings on eagles and the_beatles.

Basically I need to put correct numbers as input to get "exactly! Good job" answer! Need help to find what will be the inputs and why those inputs works!

3 solutions

Solution 1

Solution 2

Solution 3

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