Compilare: user.cpp: In function ‘int main()’: user.cpp:35:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d\n%d %d\n", &v, &m, &n); ^ user.cpp:41:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%c", &a[i][j]); ^ user.cpp:44:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "\n"); ^ user.cpp:120:47: warning: ‘ky’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(g, "%d %d\n%c\n", si, sj, c[kx][ky]); ^ user.cpp:120:47: warning: ‘kx’ may be used uninitialized in this function [-Wmaybe-uninitialized]