View Compilation Error

0_0_19661441_881.c: In function 'main':
0_0_19661441_881.c:3:26: error: expected expression before '/' token
   int n, m, i, j, count; // n students, m classes, sum of m scores
                          ^
0_0_19661441_881.c:9:27: error: 'b' undeclared (first use in this function)
   for (i = 0; i < n; ++i) b[i] = 0;
                           ^
0_0_19661441_881.c:9:27: note: each undeclared identifier is reported only once for each function it appears in
0_0_19661441_881.c:10:27: error: 'a' undeclared (first use in this function)
   for (j = 0; j < m; ++j) a[j] = 0;
                           ^
0_0_19661441_881.c:13:21: error: 'c' undeclared (first use in this function)
       scanf("%lf", &c[i][j]);
                     ^