puncte.cpp: In function 'bool bkt(int)': puncte.cpp:32: warning: comparison between signed and unsigned integer expressions puncte.cpp:33: warning: comparison between signed and unsigned integer expressions puncte.cpp:39: warning: comparison between signed and unsigned integer expressions puncte.cpp:65: warning: comparison between signed and unsigned integer expressions puncte.cpp:75: warning: comparison between signed and unsigned integer expressions puncte.cpp:101: warning: comparison between signed and unsigned integer expressions puncte.cpp: In function 'int main()': puncte.cpp:118: warning: NULL used in arithmetic