# Dilu's Library

Dilu is a young boy who loves mathematics. He recently learned how to code. He was interested in sol…

If you need help solving this problem, mention your approach and ask specific questions. Please avoid sharing your code and asking the Community to figure out “what’s wrong”.

Why I’m geting WA?

/********************
Riz1 Ahmed, CSE, LU.
Redirecting...
Code Start Time: 2019-12-19-20.16
******************/
#include<bits/stdc++.h>
#define write freopen(“out.txt”,“w”,stdout);
#define Fast ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define ll long long int
const ll M=1e9+7;
using namespace std;
int main(){
ll a,b,i;
scanf("%d");
while(~scanf(“%lld %lld”,&a,&b)){
string ans=“”;
ans+=to_string(a/b);
a%=b, a
=10;
ans+=‘.’;
for (i=1; i<100; i++)
ans+=to_string(a/b), a%=b, a
=10;
ll x=a/b; a%=b, a
=10;
if (a/b>4) x++;
ans+=to_string(x);
while(ans.back()==‘0’) ans.pop_back();
if (ans.back()==‘.’) ans.pop_back();
cout<<ans<<endl;
}
return 0;
}

Can anyone tell me why I’m getting WA in testcase 2?

#include<stdio.h>

int main()
{
long long a, b;
int T, r, i;
scanf(“%d”, &T);
while(T–) {
scanf(“%lld%lld”, &a, &b);
printf(“%lld”, a/b);
int c;
for(i=0; i<100; i++) {
c[i] = 0;
}
for(i=0; i<100; i++) {
r = a % b;
a = r*10;
c[i] = a/b;
if(i==0 && r!=0) {
printf(“.”);
}
else if(r==0) {
break;
}
}
if(c > 4) {
int carry = 1;
for(i=98; i>=0; i–) {
if(c[i]+carry > 9) {
c[i] = c[i]%10;
carry = (int)c[i]/10;
}
else {
c[i] = c[i]+carry;
carry = 0;
}
if(carry==0) {
break;
}
}
}
for(i=0; i<99; i++) {
if(c[i] == 0) {
int j,t = 1;
for(j=i; j<99; j++) {
if(c[j] == 0) {
t = 0;
}
else {
t = 1;
break;
}
}
if(t==1) {
printf(“%d”, c[i]);
}
else {
break;
}
}
else {
printf(“%d”, c[i]);
}
}
printf(“\n”);
}
return 0;
}

Why gettin WA?

``````#include<set>
#include<iostream>
#include<vector>
#include<algorithm>
#include<stack>
#include<climits>
#include<cstring>
#include<cmath>
#include<unordered_map>
#include<sstream>
#include<cmath>
#include<iomanip>
#include<numeric>
using namespace std;

int main(){
int n;
cin>>n;
while(n){
double a,b;
cin>>a>>b;
cout<<setprecision(100)<<(double)a/b<<endl;
n--;
}
}``````