Compilare: user.cpp: In function ‘int main()’: user.cpp:25:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < strlen(str); j++){ ^ user.cpp:42:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (strlen(str) < m) ^ user.cpp:11:31: warning: unused variable ‘l’ [-Wunused-variable] int m,n,x1,y1,x2,y2,X,Y,P,l,cc,b[100][100],c[100][100],d[100][100],s,f; ^ user.cpp:11:33: warning: unused variable ‘cc’ [-Wunused-variable] int m,n,x1,y1,x2,y2,X,Y,P,l,cc,b[100][100],c[100][100],d[100][100],s,f; ^ user.cpp:12:10: warning: unused variable ‘a’ [-Wunused-variable] char a[100][100]; ^ user.cpp:49:14: warning: ‘x1’ may be used uninitialized in this function [-Wmaybe-uninitialized] Q[1].x=x1; ^ user.cpp:50:14: warning: ‘y1’ may be used uninitialized in this function [-Wmaybe-uninitialized] Q[1].y=y1; ^ user.cpp:145:14: warning: ‘y2’ may be used uninitialized in this function [-Wmaybe-uninitialized] Q[1].y=y2; ^ user.cpp:144:14: warning: ‘x2’ may be used uninitialized in this function [-Wmaybe-uninitialized] Q[1].x=x2; ^ user.cpp:248:32: warning: ‘yi’ may be used uninitialized in this function [-Wmaybe-uninitialized] w<<mini+1<<" "<<xi<<" "<<yi; ^ user.cpp:248:21: warning: ‘xi’ may be used uninitialized in this function [-Wmaybe-uninitialized] w<<mini+1<<" "<<xi<<" "<<yi; ^