Eroare de 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:28:14: error: 'strupr' was not declared in this scope strupr(s1); ^ main.cpp:29:11: warning: statement has no effect [-Wunused-value] strstr(s1,s2); ~~~~~~^~~~~~~ main.cpp:37:17: error: 'ltoa' was not declared in this scope ltoa(x,s1,10); ^ Non zero exit status: 1