Include time header file #include Write main method like this : int main(){ time_t start_t, end_t; double diff_t; time(&start_t); // capturing start time int n; printf(\"Enter number of stuents (<=30): \"); scanf(\"%d\", &n); GradeBook *students = (GradeBook *)malloc(sizeof(GradeBook)*n); int i,j; // taking n entries for(i=0; i Solution Include time header file #include Write main method like this : int main(){ time_t start_t, end_t; double diff_t; time(&start_t); // capturing start time int n; printf(\"Enter number of stuents (<=30): \"); scanf(\"%d\", &n); GradeBook *students = (GradeBook *)malloc(sizeof(GradeBook)*n); int i,j; // taking n entries for(i=0; i.