Compilare: main.cpp: In function 'void test_functions()': main.cpp:26:11: warning: statement has no effect [-Wunused-value] strchr(s1,c); ~~~~~~^~~~~~ main.cpp:27:12: warning: statement has no effect [-Wunused-value] strrchr(s1,c); ~~~~~~~^~~~~~ main.cpp:28:11: warning: statement has no effect [-Wunused-value] strstr(s1,s2); ~~~~~~^~~~~~~ main.cpp:14:9: warning: variable 'n' set but not used [-Wunused-but-set-variable] int n; ^ main.cpp:15:10: warning: variable 'x' set but not used [-Wunused-but-set-variable] long x; ^ main.cpp:16:12: warning: variable 'y' set but not used [-Wunused-but-set-variable] double y; ^ main.cpp:18:13: warning: variable 'p' set but not used [-Wunused-but-set-variable] char c,*p; ^