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lab13.c

+#include <stdio.h>
+#include <string.h>
+#define DOCLENGTH 9
+#define NAMEMAX 12
+int insert_into_arrays(char names[DOCLENGTH][NAMEMAX], char emails[DOCLENGTH][NAMEMAX], char new_name[NAMEMAX], char new_email[NAMEMAX]);
+void sort_arrays(char names[DOCLENGTH][NAMEMAX], char emails[DOCLENGTH][NAMEMAX]);
+void fill_arrays(char names[DOCLENGTH][NAMEMAX], char emails[DOCLENGTH][NAMEMAX], char file_name[50]);
+int main(int argc, char* argv[]){
+    if(argc < 2){
+        printf("I need an argument.\n open cmd line or terminal, navigate to the directory where this file is stored, and run this program as:\
+        \n'./thisprogram file_to_open'\nif on linux \nor\
+        \n'thisprogram.exe file_to_open'\nif on windows");
+        return 1;
+    }
+    char file_name[50];
+    //copy our first argument into the file_name string
+    strcpy(file_name, argv[1]);
+    
+    // we allocate two arrays, one for names, one for emails 
+    char names [DOCLENGTH][NAMEMAX];
+    char emails [DOCLENGTH][NAMEMAX];
+    
+    //fill_arrays reads the file and fills the arrays with this data
+    fill_arrays(names, emails, file_name);
+    
+    //print out the current state of the array
+    for(int i=0; i < DOCLENGTH; i++){
+        printf("%s %s\n", names[i], emails[i]);
+    }
+    
+    
+    // sort the data alphabetically by name
+    sort_arrays(names, emails);
+    puts("\n\n");
+    // print the current state of the arrays
+    for(int i = 0; i < DOCLENGTH; i++){
+        printf("%s %s\n", names[i], emails[i]);
+    }
+    
+    //allocate a space for new name and email
+    char new_name[NAMEMAX];
+    char new_email[NAMEMAX];
+    
+    //get user input
+    printf("enter a name to insert");
+    scanf("%s", new_name);
+    
+    printf("enter that person's email");
+    scanf("%s", new_email);
+    //insert this new entry in the right place in the arrays
+    int slot = insert_into_arrays(names, emails, new_name, new_email);
+    
+    puts("\n\n");
+    //print the current state of the arrays
+    for(int i = 0; i < DOCLENGTH; i++){
+        if(i == slot){
+            printf("this is the one added  ");
+        }
+        printf("%s %s\n", names[i], emails[i]);
+    }
+    return 0;
+}
+void fill_arrays(char names[DOCLENGTH][NAMEMAX], char emails[DOCLENGTH][NAMEMAX], char file_name[50]){
+    //open the file for reading
+    FILE* data = fopen("file_name", "r");
+    // one at a time, insert entries into the arrays
+    for( int i = 0; i < DOCLENGTH; i++){
+        fscanf(data, "%s %s", names[i], emails[i]);
+    }
+    //always close the file!
+    fclose(data);
+}
+void sort_arrays(char names[DOCLENGTH][NAMEMAX], char emails[DOCLENGTH][NAMEMAX]){
+    //allocate a temporary string for shuffling
+    char temp[NAMEMAX];
+    
+    //the brk variable tells us when we should break out of the loop
+    int brk;
+    
+    //i tells us the number of times we've gone through the dataset
+    int i;
+    
+    //break == 0 is the flag to tell us that no changes were made, and the set is sorted
+    while(brk == 0){
+        brk = 0;
+        //j tells us which member of the array we're inspecting
+        for(int j = 0; j < DOCLENGTH - i; j++){
+            //if a pair needs to be swithed
+            if( names[j][0] > names[j+1][0]){
+                //record that a switch was made
+                brk = 1;
+                //perform a switch of both emails and names
+                strcpy(temp, names[j]);
+                strcpy(names[j], names[j+1]);
+                strcpy(names[j+1], temp);
+                
+                strcpy(temp, emails[j+1]);
+                strcpy(emails[j+1], emails[j]);
+                strcpy(emails[j], temp);
+            }
+            i++;
+        }
+    }
+}
+int insert_into_arrays(char names[DOCLENGTH][NAMEMAX], char emails[DOCLENGTH][NAMEMAX], char new_name[NAMEMAX], char new_email[NAMEMAX]){
+    //initialize outside of the loop, so that we will still have it for returning
+    int i=1;
+    
+    // i tells us which member of the array we're inspecting
+    for(; i<DOCLENGTH; i++){
+        
+        //if the first letter of this name belongs before the entry we're looking at
+        if(new_name[0] < names[i][0]){
+            //(DOCLENGTH-i)*NAMEMAX is the size of the block we're moving
+            int move_size = (DOCLENGTH)*NAMEMAX;
+            //copy the rest of the name array one slot forward
+            memcpy(&names[i+1][0], &names[i][0], move_size);
+            
+            //copy the new name and email into the now opened slot
+            strcpy(names[i], new_name);
+            strcpy(emails[i], new_email);
+            break;
+        }
+        
+    }
+    //return the index of the slot that we placed it in
+    return i;
+}