Compilare: user.cpp: In function ‘int prim(int)’: user.cpp:9:5: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation] for(int i=3;i<a/2;i++) ^~~ user.cpp:12:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘for’ return 1; ^~~~~~ user.cpp:6:22: warning: unused variable ‘k’ [-Wunused-variable] int prim(int a) {int k=0; ^ user.cpp: In function ‘int main()’: user.cpp:19:1: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation] for(int i=2;i<=N;i++) ^~~ user.cpp:22:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘for’ g<<k; ^