Fixed several relicts from former example solutions

Again, thanks to Ralf Ziefuhs for pointing that out too

ch_3/task_09/main.c

@@ -20,7 +20,6 @@ int main (void) {
     /*** Local Variables ***/
     char input[80];
     char output[80];
-    int ch;
     int n;
     int i=0,j=0;
     
@@ -28,8 +27,6 @@ int main (void) {
     printf("Please enter the key n: ");
     /* Read in the user's input */
     scanf("%d",&n);
-    /* Flush stdin buffer */
-    while (((ch = getchar()) != '\n') && (ch != EOF));
     
     /* Ask the user to enter a string */
     printf("Please enter a string: ");

ch_3/task_10/main.c

@@ -20,7 +20,6 @@ int main (void) {
     /*** Local Variables ***/
     char input[80];
     char output[80];
-    int ch;
     int n;
     int i=0;
     
@@ -28,8 +27,6 @@ int main (void) {
     printf("Please enter the key n: ");
     /* Read in the user's input */
     scanf("%d",&n);
-    /* Flush stdin buffer */
-    while (((ch = getchar()) != '\n') && (ch != EOF));
     
     /* Ask the user to enter a string */
     printf("Please enter a Caesar decrypted string: ");

ch_3/task_13/main.c

@@ -34,6 +34,8 @@ int main (void) {
         printf("Please enter the %d. name: ",(i+1));
         /* Read in the user's input */
         fgets(name[i],STRING_MAX,stdin);
+        /* Remove trailing newline */
+        strtok(name[i],"\n");
     }
     
     /* Convert names to lower case */

ch_3/task_15/main.c

@@ -35,6 +35,8 @@ int main (void) {
     printf("Please enter the first number as Roman numeral: ");
     /* Read in the user's input */
     fgets(rom_value1,STRING_MAX,stdin);
+    /* Remove trailing newline */
+    strtok(rom_value1,"\n");
     
     /* Convert the first number to a decimal number */
     while ((rom_value1[i]!='\0') && (i<40)) {

ch_4/task_09/main.c

@@ -129,8 +129,6 @@ int main (void) {
     /*** Local Variables ***/
     int students;
     int grades[STUDENT_MAX][NUM_LECTURES];
-    /* Helper for buffer flushing */
-    int ch;
     
     /* At least one user input is required */
     do {
@@ -153,10 +151,9 @@ int main (void) {
     for (int i=0; i<students; i++) {
         /* Temporary string for user input */
         char string[STRING_MAX];
-        /* Flush stdin buffer */
-        while (((ch = getchar()) != '\n') && (ch != EOF));
         /* Ask the user to enter the CSV string */
-        printf("Please enter the %d grades in a CSV-like fashion: ",NUM_LECTURES);        /* Read in the user's input */
+        printf("Please enter the %d grades in a CSV-like fashion: ",NUM_LECTURES);
+        /* Read in the user's input */
         fgets(string,STRING_MAX,stdin);
         /* Remove trailing newline */
         strtok(string,"\n");

ch_4/task_14/main.c

@@ -76,17 +76,13 @@ int main (void) {
     /*** Local Variables ***/
     char letter;
     char string[STRING_MAX+1];
-    /* Helper for buffer flushing */
-    int ch;
     int occurrence;
     
     /* Ask the user to enter the desired letter */
     printf("Please enter the letter to be counted: ");
     /* Read in the user's input */
-    scanf("%c",&letter);
+    scanf(" %c%*c",&letter);
     
-    /* Flush stdin buffer */
-    while (((ch = getchar()) != '\n') && (ch != EOF));
     /* Ask the user to input the string */
     printf("Please enter the string (max. %d letters):\n",STRING_MAX);
     /* Read in the user's input */

ch_6/task_02/main.c

@@ -118,8 +118,6 @@ int main (void) {
     int temp;
     feature abs;
     double price = 0.0;
-    /* Helper for buffer flushing */
-    int ch;
     
     /* Read in 3 cars */
     for (int i=0; i<3; i++) {
@@ -165,8 +163,6 @@ int main (void) {
             free(car);
         }
         
-        /* Flush stdin buffer */
-        while (((ch = getchar()) != '\n') && (ch != EOF));
         /* Print a newline for formatting reasons */
         printf("\n");
     }

ch_6/task_04/main.c

@@ -13,6 +13,7 @@
 /***** INCLUDES ***************************************************************/
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 
 /***** MACROS *****************************************************************/
@@ -67,11 +68,15 @@ void list_add_person (person_t** head) {
     printf("Please enter the person's first name: ");
     /* Read in the user's input */
     fgets(new->firstname,STRING_MAX,stdin);
+    /* Remove trailing newline */
+    strtok(new->firstname,"\n");
     
     /* Ask the user to input the persons last name */
     printf("Please enter the person's last name: ");
     /* Read in the user's input */
     fgets(new->lastname,STRING_MAX,stdin);
+    /* Remove trailing newline */
+    strtok(new->lastname,"\n");
     
     /* Ask the user to input the persons year of birth */
     printf("Please enter the person's year of birth: ");

ch_6/task_05/main.c

@@ -263,8 +263,6 @@ int main (void) {
     int day,month_tmp;
     month_t month;
     char select = 'x';
-    /* Helper for buffer flushing */
-    int ch;
     
     /* Do as long as the users wants to do an action */
     do {
@@ -284,9 +282,6 @@ int main (void) {
                 /** Add a new entry **/
                 printf("\n... Adding a new entry ...\n");
                 
-                /* Flush stdin buffer */
-                while (((ch = getchar()) != '\n') && (ch != EOF));
-                
                 /* Ask the user to enter the name of the event */
                 printf("Please enter the name of the event (max. %d character): ",(STRING_MAX-1));
                 /* Read in the user's input */

ch_6/task_06/main.c

@@ -406,8 +406,8 @@ int main (void) {
     printf("Please enter the name of the directory to scan: ");
     /* Read in the user input */
     fgets(path,STRING_MAX,stdin);
-    /* Terminate the directory path string */
-    path[strlen(path)-1] = '\0';
+    /* Remove trailing newline */
+    strtok(path,"\n");
     
     /* Scan directory and read in the songs */
     if (songs_scan(&head,path) == 0) {

ch_6/task_07/main.c

@@ -14,6 +14,7 @@
 #include <stdio.h>
 #include <time.h>
 #include <stdlib.h>
+#include <string.h>
 
 
 /***** MACROS *****************************************************************/
@@ -320,6 +321,8 @@ int main (void) {
         printf("Please enter one of the numbers shown above: ");
         /* Read in the user's input as string */
         fgets(input,STRING_MAX,stdin);
+        /* Remove trailing newline */
+        strtok(input,"\n");
         /* Check if string contains a number */
         if (sscanf(input,"%d",&number) == 0) {
             /* No number found */

ch_6/task_08/main.c

@@ -426,6 +426,8 @@ int main (void) {
     printf("Please enter the name of the text file: ");
     /* Read in the user input */
     fgets(path,STRING_MAX,stdin);
+    /* Remove trailing newline */
+    strtok(path,"\n");
     
     /* (Try to) read the given text file */
     retval = list_read_textfile(&head,path);

ch_6/task_09/main.c

@@ -176,6 +176,8 @@ int main (void) {
                 printf("Please enter the desired command: ");
                 /* Read in the user's input */
                 fgets(command,STRING_MAX,stdin);
+                /* Remove trailing newline */
+                strtok(command,"\n");
                 /* (Try to) push the command on the stack */
                 ret = stack_push(&head,command);
                 /* Check if pushing was successful */

ch_6/task_10/main.c

@@ -252,6 +252,8 @@ int main (void) {
                 printf("Please enter the desired string: ");
                 /* Read in the user's input */
                 fgets(string,STRING_MAX,stdin);
+                /* Remove trailing newline */
+                strtok(string,"\n");
                 /* Ask the user to input the priority */
                 printf("Please enter the desired priority: ");
                 /* Read in the user's input */

ch_6/task_11/main.c

@@ -158,6 +158,8 @@ int main (void) {
                 printf(" ... please enter the %d. value: ",(i+1));
                 /* Read in the user's input */
                 fgets(temp,STRING_MAX,stdin);
+                /* Remove trailing newline */
+                strtok(temp,"\n");
                 /* Analyze the given string */
                 if (analyze_input(temp,curr) == VALID) {
                     /* Valid input */