Compilare: user.cpp: In function ‘int main()’: user.cpp:84:23: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(v+1,1005,si); ^ user.cpp:158:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(si,"%i",&n); ^ user.cpp: In function ‘int calc(int, int, int)’: user.cpp:17:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int expresie()’: user.cpp:12:5: warning: ‘o2’ may be used uninitialized in this function [-Wmaybe-uninitialized] switch(o) ^ user.cpp:41:21: note: ‘o2’ was declared here int v1,v2,v3,o1,o2; ^ user.cpp: In function ‘int main()’: user.cpp:12:5: warning: ‘o2’ may be used uninitialized in this function [-Wmaybe-uninitialized] switch(o) ^ user.cpp:41:21: note: ‘o2’ was declared here int v1,v2,v3,o1,o2; ^ user.cpp:12:5: warning: ‘o2’ may be used uninitialized in this function [-Wmaybe-uninitialized] switch(o) ^ user.cpp:41:21: note: ‘o2’ was declared here int v1,v2,v3,o1,o2; ^ user.cpp:12:5: warning: ‘o2’ may be used uninitialized in this function [-Wmaybe-uninitialized] switch(o) ^ user.cpp:41:21: note: ‘o2’ was declared here int v1,v2,v3,o1,o2; ^ user.cpp:12:5: warning: ‘o2’ may be used uninitialized in this function [-Wmaybe-uninitialized] switch(o) ^ user.cpp:41:21: note: ‘o2’ was declared here int v1,v2,v3,o1,o2; ^ user.cpp:12:5: warning: ‘o2’ may be used uninitialized in this function [-Wmaybe-uninitialized] switch(o) ^ user.cpp:41:21: note: ‘o2’ was declared here int v1,v2,v3,o1,o2; ^ user.cpp:12:5: warning: ‘o2’ may be used uninitialized in this function [-Wmaybe-uninitialized]