online compiler and debugger for c/c++

#include <stdio.h> #include <string.h> #define SIZE 129 #define LEN 11 // student record structure typedef struct Student { char ID[LEN]; char name[LEN]; int math; int eng; int cs; } STUDENT; // check if the record is in the system // nedded by all the 4 functions int locate(STUDENT stu[SIZE], char sid[LEN], int count); // Followings are 4 functionalities void addRecord(STUDENT stu[SIZE], char sid[LEN], int *count); void deleteRecord(STUDENT stu[SIZE], char sid[LEN], int *count); void updateRecord(STUDENT stu[SIZE], char sid[LEN], int count); void printRecord(STUDENT stu[SIZE], char sid[LEN], int count); int main() { STUDENT stu[SIZE]; int op; char sid[LEN]; int i, n; int count = 0; // Total number of records in the system scanf("%d", &n); // how many actions to do for (i = 0; i < n; i++) { // read in ops and studentID in order to determine what to do scanf("%d%s", &op, sid); if (op == 1) { addRecord(stu, sid, &count); } else if (op == 2) { deleteRecord(stu, sid, &count); } else if (op == 3) { updateRecord(stu, sid, count); } else // op == 4 { printRecord(stu, sid, count); } } return 0; } int locate(STUDENT stu[SIZE], char sid[LEN], int count) { int loc = 0; while (loc < count) { if (strcmp(stu[loc].ID, sid) == 0) return loc; loc++; } return -1; // means no record } void addRecord(STUDENT stu[SIZE], char sid[LEN], int *count) { int loc; loc = locate(stu, sid, *count); // read and put the record at the end of the array temporarily // NECESSARY!!! even if the record already exists strcpy(stu[*count].ID, sid); scanf("%s", stu[*count].name); scanf("%d%d%d", &stu[*count].math, &stu[*count].eng, &stu[*count].cs); if (loc == -1) { // if not already exist, increment count to make the record valid *count += 1; printf("Add success\n"); } else { printf("Students already exist\n"); } } void deleteRecord(STUDENT stu[SIZE], char sid[LEN], int *count) { int i, loc; loc = locate(stu, sid, *count); if (loc != -1) { // if the record exists, delete it // by shift the following records one index up, // and then decrement count by 1 for (i = loc; i < *count - 1; i++) { stu[i] = stu[i + 1]; } *count -= 1; printf("Delete success\n"); } else { printf("Students do not exist\n"); } } void updateRecord(STUDENT stu[SIZE], char sid[LEN], int count) { int loc; loc = locate(stu, sid, count); if (loc != -1) { // if the record exists, update by reading new values scanf("%d%d%d", &stu[loc].math, &stu[loc].eng, &stu[loc].cs); printf("Update success\n"); } else { // abandon input value by putting them after the end of list // NECESSARY!!! scanf("%d%d%d", &stu[count].math, &stu[count].eng, &stu[count].cs); printf("Students do not exist\n"); } } void printRecord(STUDENT stu[SIZE], char sid[LEN], int count) { int loc; loc = locate(stu, sid, count); if (loc != -1) { // if record exists, print out student info printf("Student ID:%s\nName:%s\n", stu[loc].ID, stu[loc].name); printf("Average Score:%.1f\n", (stu[loc].math + stu[loc].eng + stu[loc].cs) / 3.0); } else { printf("Students do not exist\n"); } }