Language: C++

#include <bits/stdc++.h>
using namespace std;

#define inf 1072114514
#define llinf 4154118101919364364
#define mod 1000000007
#define pi 3.1415926535897932384


int round(int a,int b){if((a%b)*2 >= b){return (a/b)+1;}return a/b;} 
int gcd(int a,int b){int c;while(b!=0){c=a%b;a=b;b=c;}return a;}    //最大公約数
int lcm(int a,int b){int c=gcd(a,b);a/=c;return a*b;}     //最小公倍数
int nCr(int a,int b){int i,r=1;for(i=1;i<=b;i++){r*=(a+1-i);r/=i;}return r;} //コンビネーション
int nHr(int a,int b){return nCr(a+b-1,b);}       // 重複組み合わせ
int fact(int a){int i,r=1;for(i=1;i<=a;i++){r*=i;}return r;}  //階乗
int pow(int a,int b){int i,r=1;for(i=1;i<=b;i++){r*=a;}return r;} // a~bまでの階乗
int dsum(int x){int r=0;while(x){r+=(x%10);x/=10;}return r;}   //数字の各位の和
int dsumb(int x,int b){int r=0;while(x){r+=(x%b);x/=b;}return r;}  // b進数の各位の和？
int sankaku(int x){return ((1+x)*x)/2;} //三角数 xまでの和

//以下long long ver
long long llmax(long long a,long long b){if(a>b){return a;}return b;}
long long llmin(long long a,long long b){if(a<b){return a;}return b;}
long long llzt(long long a,long long b){return llmax(a,b)-llmin(a,b);}
long long llround(long long a,long long b){if((a%b)*2 >= b){return (a/b)+1;}return a/b;}
long long llceil(long long a,long long b){if(a%b==0){return a/b;}return (a/b)+1;}
long long llgcd(long long a,long long b){long long c;while(b!=0){c=a%b;a=b;b=c;}return a;}
long long lllcm(long long a,long long b){long long c=llgcd(a,b);a/=c;return a*b;}
long long llnCr(long long a,long long b){long long i,r=1;for(i=1;i<=b;i++){r*=(a+1-i);r/=i;}return r;}
long long llnHr(long long a,long long b){return llnCr(a+b-1,b);}
long long llfact(long long a){long long i,r=1;for(i=1;i<=a;i++){r*=i;}return r;}
long long llpow(long long a,long long b){long long i,r=1;for(i=1;i<=b;i++){r*=a;}return r;}
long long lldsum(long long x){long long r=0;while(x){r+=(x%10);x/=10;}return r;}
long long lldsumb(long long x,long long b){long long r=0;while(x){r+=(x%b);x/=b;}return r;}
long long llsankaku(long long x){return ((1+x)*x)/2;}

//double
double dbmax(double a,double b){if(a>b){return a;}return b;}
double dbmin(double a,double b){if(a<b){return a;}return b;}
double dbzt(double a,double b){return dbmax(a,b)-dbmin(a,b);}


typedef pair<int, int> ii;
typedef long long ll;
typedef vector<ll> vll;
typedef pair<ll,ll> pll;
#define forr(i,a,b) ; for(int i=(a); i<(b); i++)
#define clean(arr,val) memset(arr,val,sizeof(arr))
#define forn(i,n) forr(i,0,n)
#define PB push_back
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<pll> vpll;
const int dx[8] = {1, 0, -1, 0, 1, -1, -1, 1};
const int dy[8] = {0, 1, 0, -1, 1, 1, -1, -1};
bool is_prime (int x){
  if (x<=1) return false ;
  for (int i=2 ; i*i<=x ; i++){
    if (x%i==0) return false ;
  }
   return true;
}
string alpha = "abcdefghijklmnopqrstuvwxyz" ;
string ALPHA = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" ;
    
bool chmin (int a,int b){
    if ( a > b ){
    a = b;
    return true ;
    }
    return false ;
}
 bool chmax (int a,int b){
    if ( a < b ){
    a = b;
    return true ;
    }
    return false ;
}   
#define SORT(c) sort((c).begin(),(c).end());
#define ANS(ans) cout<<(ans)<<endl;
 char ans (int x){
   if ( x == 1){
     return '+';
   }else {
     return '-';
   }
 }
/*CODE START HERE*/
int main() {
  int v[2];
  v[0] = -1;
  v[1] = 1;
  int n;
  cin >> n
  int a,b,c,d;
  d = n%10;
  c = ((n-d)%100)/10;
  b = ((n-c-d)%1000)/100;
  a = n-100*b - 10*c -d; 
    forn(j,1){
      forn(k,1){
        forn(l,1){
          if(a+b*v[j]+k+v[k]+l*v[l]==7){
            cout << a <<  ans(v[j])  << b  << ans(v[k]) <<  c <<  ans(v[k]) <<  d << '=7' << endl;
            return 0;
          }
        }
      }
    }
  return 0;
}

Compiler output:
a.cc:105:86: warning: multi-character character constant [-Wmultichar]
  105 |             cout << a <<  ans(v[j])  << b  << ans(v[k]) <<  c <<  ans(v[k]) <<  d << '=7' << endl;
      |                                                                                      ^~~~
a.cc: In function 'int main()':
a.cc:95:11: error: expected ';' before 'int'
   95 |   cin >> n
      |           ^
      |           ;
   96 |   int a,b,c,d;
      |   ~~~      
a.cc:97:3: error: 'd' was not declared in this scope
   97 |   d = n%10;
      |   ^
a.cc:98:3: error: 'c' was not declared in this scope
   98 |   c = ((n-d)%100)/10;
      |   ^
a.cc:99:3: error: 'b' was not declared in this scope
   99 |   b = ((n-c-d)%1000)/100;
      |   ^
a.cc:100:3: error: 'a' was not declared in this scope
  100 |   a = n-100*b - 10*c -d;
      |   ^