Compilare: user.cpp: In function ‘int main()’: user.cpp:103:60: warning: operation on ‘p’ may be undefined [-Wsequence-point] polin[p++]=ir(polin[p-2], poli2[i%m], poli1, n); ^ user.cpp:110:60: warning: operation on ‘p’ may be undefined [-Wsequence-point] polin[p++]=ir(polin[p-2], poli1[i%n], poli2, m); ^ user.cpp:60:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arie.in", "r", stdin); ^ user.cpp:61:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arie.out", "w", stdout); ^ user.cpp:62:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:63:63: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i=1; i<=n; ++i)scanf("%f%f", &poli1[i].x, &poli1[i].y); ^ user.cpp:65:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &m); ^ user.cpp:66:63: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i=1; i<=m; ++i)scanf("%f%f", &poli2[i].x, &poli2[i].y); ^ user.cpp:87:26: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] b1=poli1[i].x-poli1[i+1].x; ^ user.cpp:89:23: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] a2=poli2[j+1].y-poli2[j].y; ^