/in/foo.cc: In function 'void loopAll(int, int)':
/in/foo.cc:25:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int j=0;j<sizeof(prime)/sizeof(int);j++) {
                     ~^~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'int main2()':
/in/foo.cc:88:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int j=0;j<sizeof(prime)/sizeof(int);j++) {
                     ~^~~~~~~~~~~~~~~~~~~~~~