activ.cpp: In function `bool df(int)': activ.cpp:26: warning: comparison between signed and unsigned integer expressions activ.cpp: In function `void afis(int)': activ.cpp:46: warning: comparison between signed and unsigned integer expressions activ.cpp:53: warning: comparison between signed and unsigned integer expressions activ.cpp: In function `int main()': activ.cpp:81: warning: comparison between signed and unsigned integer expressions activ.cpp:91:2: warning: no newline at end of file