Compilare: user.cpp: In function ‘void calcul_tabele()’: user.cpp:33:9: warning: unused variable ‘i’ [-Wunused-variable] int i, j, k, l, a, b; ^ user.cpp:33:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, k, l, a, b; ^ user.cpp:33:18: warning: unused variable ‘l’ [-Wunused-variable] int i, j, k, l, a, b; ^ user.cpp:33:21: warning: unused variable ‘a’ [-Wunused-variable] int i, j, k, l, a, b; ^ user.cpp:33:24: warning: unused variable ‘b’ [-Wunused-variable] int i, j, k, l, a, b; ^ user.cpp: In function ‘int operatie(int, int, int)’: user.cpp:54:27: warning: unused variable ‘z’ [-Wunused-variable] int i, a, b, sol = 0, z; ^ user.cpp: In function ‘int main()’: user.cpp:104:47: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(inputFileName.c_str(), "r", stdin); ^ user.cpp:105:49: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(outputFileName.c_str(), "w", stdout); ^ user.cpp:107:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &T); ^ user.cpp:115:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:119:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &A[i][j]); ^