Compilare: user.cpp: In function ‘int add(int, int)’: user.cpp:18:42: warning: operation on ‘k1’ may be undefined [-Wsequence-point] case 1000: k1 = (++k1 + 10) % 10; break; ^ user.cpp:19:42: warning: operation on ‘k2’ may be undefined [-Wsequence-point] case 100: k2 = (++k2 + 10) % 10; break; ^ user.cpp:20:42: warning: operation on ‘k3’ may be undefined [-Wsequence-point] case 10: k3 = (++k3 + 10) % 10; break; ^ user.cpp:21:42: warning: operation on ‘k4’ may be undefined [-Wsequence-point] case 1: k4 = (++k4 + 10) % 10; break; ^ user.cpp:22:42: warning: operation on ‘k1’ may be undefined [-Wsequence-point] case -1000: k1 = (--k1 + 10) % 10;; break; ^ user.cpp:23:42: warning: operation on ‘k2’ may be undefined [-Wsequence-point] case -100: k2 = (--k2 + 10) % 10;; break; ^ user.cpp:24:42: warning: operation on ‘k3’ may be undefined [-Wsequence-point] case -10: k3 = (--k3 + 10) % 10;; break; ^ user.cpp:25:42: warning: operation on ‘k4’ may be undefined [-Wsequence-point] case -1: k4 = (--k4 + 10) % 10;; break; ^ user.cpp: In function ‘int main()’: user.cpp:69:64: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sizeof(STEPS) / sizeof(STEPS[0]); ++i) { ^