timeval未返回预期结果

#include <stdio.h>
#include <sys/time.h>

typedef struct{
     struct timeval timestamp;
}teststruct;

class TestClass {
     public:
       TestClass();
       void dosomething(int, int);
};

TestClass::TestClass(){
}

void
TestClass::dosomething(int num, int numb) {
}

int main(void){
     TestClass *testclass = new TestClass();
     teststruct test;
     gettimeofday(&test.timestamp, NULL);
     printf(\"%llu \\n\", test.timestamp.tv_sec);
     testclass->dosomething(1,1);
     printf(\"%llu \\n\", test.timestamp.tv_sec);
}