Compilare: user.cpp: In function ‘int main()’: user.cpp:156:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<s.size(); i++) ^ user.cpp: In function ‘void SUBSTRACT_1()’: user.cpp:54:12: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized] N1[0]=l; ^ user.cpp: In function ‘void SUBSTRACT_2()’: user.cpp:78:14: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized] N2[0]=l; ^ user.cpp: In function ‘void MULTIPLY_N_4()’: user.cpp:85:20: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized] int i, j, t=0, l; ^ user.cpp: In function ‘void MULTIPLY_N1_2()’: user.cpp:108:20: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized] int i, j, t=0, l; ^ user.cpp: In function ‘void MULTIPLY_N1_N2()’: user.cpp:131:20: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized] int i, j, t=0, l; ^