Compilare: user.c: In function ‘put’: user.c:16:3: warning: braces around scalar initializer [enabled by default] int** res = {{1, 0}, {0, 1}}; ^ user.c:16:3: warning: (near initialization for ‘res’) [enabled by default] user.c:16:3: warning: initialization makes pointer from integer without a cast [enabled by default] user.c:16:3: warning: (near initialization for ‘res’) [enabled by default] user.c:16:3: warning: excess elements in scalar initializer [enabled by default] user.c:16:3: warning: (near initialization for ‘res’) [enabled by default] user.c:16:3: warning: braces around scalar initializer [enabled by default] user.c:16:3: warning: (near initialization for ‘res’) [enabled by default] user.c:16:3: warning: excess elements in scalar initializer [enabled by default] user.c:16:3: warning: (near initialization for ‘res’) [enabled by default] user.c:16:3: warning: excess elements in scalar initializer [enabled by default] user.c:16:3: warning: (near initialization for ‘res’) [enabled by default] user.c: In function ‘main’: user.c:38:3: warning: passing argument 1 of ‘put’ from incompatible pointer type [enabled by default] int** mult = put(tab, k - 1); ^ user.c:14:7: note: expected ‘int **’ but argument is of type ‘int (*)[2]’ int** put(int** n, int p) { ^ user.c:29:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d\n", &k); ^ user.c: In function ‘prod’: user.c:6:5: warning: ‘res’ is used uninitialized in this function [-Wuninitialized] res[0][0] = (a[0][0] * b[0][0] + a[0][1] * b[1][0]) % M; ^