Language: C++

#include <iostream>
using namespace std;
#include <stdio.h>
int main()
{
????????long long int a[100][100],b[100][100],c[100][100]={0};
????????int n,m,l,i,j,k;
????????cin>>n>>m>>l;
????????for (i=0;i<n;i++)for(j=0;j<m;j++)cin>>a[i][j];
????????for (i=0;i<m;i++)for(j=0;j<l;j++)cin >> b[i][j];
????????for (i=0;i<n;i++)for(j=0;j<l;j++)for (k=0;k<m;k++)c[i][j]+=a[i][k]*b[k][j];
????????for (i=0;i<n;i++){for(j=0;j<l;j++){
????????????????????????if (!j)printf("%ld", c[i][j]);
????????????????????????else printf(" %ld", c[i][j]); 
????????????????}
????????????????cout<<endl;
????????}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:1: error: expected primary-expression before '?' token
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      | ^
a.cc:6:2: error: expected primary-expression before '?' token
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |  ^
a.cc:6:3: error: expected primary-expression before '?' token
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |   ^
a.cc:6:4: error: expected primary-expression before '?' token
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |    ^
a.cc:6:5: error: expected primary-expression before '?' token
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |     ^
a.cc:6:6: error: expected primary-expression before '?' token
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |      ^
a.cc:6:7: error: expected primary-expression before '?' token
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |       ^
a.cc:6:8: error: expected primary-expression before '?' token
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |        ^
a.cc:6:9: error: expected primary-expression before 'long'
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |         ^~~~
a.cc:6:9: error: expected ':' before 'long'
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |         ^~~~
      |         :
a.cc:6:9: error: expected primary-expression before 'long'
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |         ^~~~
a.cc:6:9: error: expected ':' before 'long'
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |         ^~~~
      |         :
a.cc:6:9: error: expected primary-expression before 'long'
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |         ^~~~
a.cc:6:9: error: expected ':' before 'long'
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |         ^~~~
      |         :
a.cc:6:9: error: expected primary-expression before 'long'
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |         ^~~~
a.cc:6:9: error: expected ':' before 'long'
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |         ^~~~
      |         :
a.cc:6:9: error: expected primary-expression before 'long'
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |         ^~~~
a.cc:6:9: error: expected ':' before 'long'
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |         ^~~~
      |         :
a.cc:6:9: error: expected primary-expression before 'long'
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |         ^~~~
a.cc:6:9: error: expected ':' before 'long'
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |         ^~~~
      |         :
a.cc:6:9: error: expected primary-expression before 'long'
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |         ^~~~
a.cc:6:9: error: expected ':' before 'long'
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |         ^~~~
      |         :
a.cc:6:9: error: expected primary-expression before 'long'
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |         ^~~~
a.cc:6:9: error: expected ':' before 'long'
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |         ^~~~
      |         :
a.cc:6:9: error: expected primary-expression before 'long'
    6 | ????????long long int a[100][100],b[100][100],c[100][100]={0};
      |         ^~~~
a.cc:7:1: error: expected primary-expression before '?' token
    7 | ????????int n,m,l,i,j,k;
      | ^
a.cc:7:2: error: expected primary-expression before '?' token
    7 | ????????int n,m,l,i,j,k;
      |  ^
a.cc:7:3: error: expected primary-expression before '?' token
    7 | ????????int n,m,l,i,j,k;
      |   ^
a.cc:7:4: error: expected primary-expression before '?' token
    7 | ????????int n,m,l,i,j,k;
      |    ^
a.cc:7:5: error: expected primary-expression before '?' token
    7 | ????????int n,m,l,i,j,k;
      |     ^
a.cc:7:6: error: expected primary-expression before '?' token
    7 | ????????int n,m,l,i,j,k;
      |      ^
a.cc:7:7: error: expected primary-expression before '?' token
    7 | ????????int n,m,l,i,j,k;
      |       ^
a.cc:7:8: error: expected primary-expression before '?' token
    7 | ????????int n,m,l,i,j,k;
      |        ^
a.cc:7:9: error: expected primary-expression before 'int'
    7 | ????????int n,m,l,i,j,k;
      |         ^~~
a.cc:7:9: error: expected ':' before 'int'
    7 | ????????int n,m,l,i,j,k;
      |         ^~~
      |         :
a.cc:7:9: error: expected primary-expression before 'int'
    7 | ????????int n,m,l,i,j,k;
      |         ^~~
a.cc:7:9: error: expected ':' before 'int'
    7 | ????????int n,m,l,i,j,k;
      |         ^~~
      |         :
a.cc:7:9: error: expected primary-expression before 'int'
    7 | ????????int n,m,l,i,j,k;
      |         ^~~
a.cc:7:9: error: expected ':' before 'int'
    7 | ????????int n,m,l,i,j,k;
      |         ^~~
      |         :
a.cc:7:9: error: expected primary-expression before 'int'
    7 | ????????int n,m,l,i,j,k;
      |         ^~~
a.cc:7:9: error: expected ':' before 'int'
    7 | ????????int n,m,l,i,j,k;
      |         ^~~
      |         :
a.cc:7:9: error: expected primary-expression before 'int'
    7 | ????????int n,m,l,i,j,k;
      |         ^~~
a.cc:7:9: error: expected ':' before 'int'
    7 | ????????int n,m,l,i,j,k;
      |         ^~~
      |         :
a.cc:7:9: error: expected primary-expression before 'int'
    7 | ????????int n,m,l,i,j,k;
      |         ^~~
a.cc:7:9: error: expected ':' before 'int'
    7 | ????????int n,m,l,i,j,k;
      |         ^~~
      |         :
a.cc:7:9: error: expected primary-expression before 'int'
    7 | ????????int n,m,l,i,j,k;
      |         ^~~
a.cc:7:9: error: expected ':' before 'int'
    7 | ????????int n,m,l,i,j,k;
      |         ^~~
      |         :
a.cc:7:9: error: expected primary-expression before 'int'
    7 | ????????int n,m,l,i,j,k;
      |         ^~~
a.cc:7:9: error: expected ':' before 'int'
    7 | ????????int n,m,l,i,j,k;
      |         ^~~
      |         :
a.cc:7:9: error: expected primary-expression before 'int'
    7 | ????????int n,m,l,i,j,k;
      |         ^~~
a.cc:8:1: error: expected primary-expression before '?' token
    8 | ????????cin>>n>>m>>l;
      | ^
a.cc:8:2: error: expected primary-expression before '?' token
    8 | ????????cin>>n>>m>>l;
      |  ^
a.cc:8:3: error: expected primary-expression before '?' token
    8 | ????????cin>>n>>m>>l;
      |   ^
a.cc:8:4: error: expected primary-expression before '?' token
    8 | ????????cin>>n>>m>>l;
      |    ^
a.cc:8:5: error: expected primary-expression before '?' token
    8 | ????????cin>>n>>m>>l;
      |     ^
a.cc:8:6: error: expected primary-expression before '?' token
    8 | ????????cin>>n>>m>>l;
      |      ^
a.cc:8:7: error: expected primary-expression before '?' token
    8 | ????????cin>>n>>m>>l;
      |       ^
a.cc:8:8: error: expected primary-expression before '?' token
    8 | ????????cin>>n>>m>>l;
      |        ^
a.cc:8:14: error: 'n' was not declared in this scope
    8 | ????????cin>>n>>m>>l;
      |              ^
a.cc:8:17: error: 'm' was not declared in this scope; did you mean 'tm'?
    8 | ????????cin>>n>>m>>l;
      |                 ^
      |                 tm
a.cc:8:20: error: 'l' was not declared in this scope
    8 | ????????cin>>n>>m>>l;
      |                    ^
a.cc:8:21: error: expected ':' before ';' token
    8 | ????????cin>>n>>m>>l;
      |                     ^
      |                     :
a.cc:8:21: error: expected primary-expression before ';' token
a.cc:8:21: error: expected ':' before ';' token
    8 | ????????cin>>n>>m>>l;
      |                     ^
      |                     :
a.cc:8:21: error: expected primary-expression before ';' token
a.cc:8:21: error: expected ':' before ';' token
    8 | ????????cin>>n>>m>>l;
      |                     ^
      |                     :
a.cc:8:21: error: expected primary-expression before ';' token
a.cc:8:21: error: expected ':' before ';' token
    8 | ????????cin>>n>>m>>l;
      |                     ^
      |                     :
a.cc:8:21: error: expected primary-expression before ';' token
a.cc:8:21: error: expected ':' before ';' token
    8 | ????????cin>>n>>m>>l;
      |                     ^
      |                     :
a.cc:8:21: error: expected primary-expression before ';' token
a.cc:8:21: error: expected ':' before ';' token
    8 | ????????cin>>n>>m>>l;
      |                     ^
      |                     :
a.cc:8:21: error: expected primary-expression before ';' token
a.cc:8:21: error: expected ':' before ';' token
    8 | ????????cin>>n>>m>>l;
      |                     ^
      |                     :
a.cc:8:21: error: expected primary-expression before ';' token
a.cc:8:21: error: expected ':' before ';' token
    8 | ????????cin>>n>>m>>l;
      |                     ^
      |                     :
a.cc:8:21: error: expected primary-expression before ';' token
a.cc:9:1: error: expected primary-expression before '?' token
    9 | ????????for (i=0;i<n;i++)for(j=0;j<m;j++)cin>>a[i][j];
      | ^
a.cc:9:2: error: expected primary-expression before '?' token
    9 | ????????for (i=0;i<n;i++)for(j=0;j<m;j++)cin>>a[i][j];
      |  ^
a.cc:9:3: error: expected primary-expression before '?' token
    9 | ????????for (i=0;i<n;i++)for(j=0;j<m;j++)cin>>a[i][j];
      |   ^
a.cc:9:4: error: expected primary-expression before '?' token
    9 | ????????for (i=0;i<n;i++)for(j=0;j<m;j++)cin>>a[i][j];
      |    ^
a.cc:9:5: error: expected primary-expression before '?' token
    9 | ????????for (i=0;i<n;i++)for(j=0;j<m;j++)cin>>a[i][j];
      |     ^
a.cc:9:6: error: expected primary-expression before '?' token
    9 | ????????for (i=0;i<n;i++)for(j=0;j<m;j++)cin>>a[i][j];
      |      ^
a.cc:9:7: error: