ex09.c - 9511_workbook - solved exercises from algorithms & programming I (9511) prof. Cardozo

guia02/ex09.c (2090B)
Line numbers
   1 /*    Reads a number of credits from stdin and prints the corresponding
   2     grade of the Engineer in stdout*/
   3 
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <ctype.h>
   7 
   8 #define MAX_LEN 5    // max digits of the entered degree;
   9 #define ERR_MSG_LEN "El numero ingresado contiene demasiados digitos"
  10 #define ERR_NEG_MSG "El numero ingresado no es valido"
  11 
  12 #define FST_YR 52
  13 #define SND_YR 104
  14 #define TRD_YR 156
  15 
  16 #define FST_MSG "Primer año"
  17 #define SND_MSG "Segundo año"
  18 #define TRD_MSG "Tercer año"
  19 #define FTH_MSG "Cuarto año"
  20 
  21 typedef enum {
  22     FIRST, SECOND, THIRD, FOURTH
  23 } year_t;
  24 
  25 typedef enum {
  26     OK, ERROR
  27 } status_t;
  28 
  29 status_t clean(char *buffer)
  30 {
  31     if(buffer == NULL)
  32         return ERROR;
  33 
  34     for(size_t i = 0; i < MAX_LEN; i++)
  35         buffer[i] = '\0';
  36     
  37     return OK;
  38 }
  39 
  40 
  41 int main(void) {
  42     
  43     /*    Defining variables    */
  44     char buffer[MAX_LEN]; 
  45     int c, credits, i;
  46     year_t year;
  47     i = 0;        
  48     
  49     /*    Cleaning buffer in case it contains a random number    */ 
  50     if(clean(buffer) == ERROR)
  51         return ERROR;
  52     
  53     /*    Reading one char from stdin and storing it on a buffer until EOF    */
  54     while(((c = getchar()) != EOF) && c != '\n') {
  55         if(i < MAX_LEN) {
  56             buffer[i] = c;
  57             i++;
  58         } else if (i >= MAX_LEN) {
  59             fprintf(stderr, ERR_MSG_LEN"\n");
  60             return 1;
  61         }
  62     }
  63     
  64     /*    Converting the first portion of buffer to int with atoi() 
  65         and cleaning the buffer    */
  66     credits = atoi(buffer);
  67     if(clean(buffer) == ERROR)
  68         return ERROR;
  69 
  70     /*    Checks if credits is a valid number    */
  71     if(credits < 0) {
  72         fprintf(stderr, ERR_NEG_MSG"\n");
  73         return 1;
  74     }
  75 
  76     /*    Evaluating the numbers of credits to match the current year     */
  77     if (credits <= FST_YR) 
  78         year = FIRST;
  79     else if ((credits > FST_YR) && (credits <= SND_YR))
  80         year = SECOND;
  81     else if ((credits > SND_YR) && (credits <= TRD_YR))
  82         year = THIRD;
  83     else if (credits > TRD_YR) 
  84         year = FOURTH;
  85 
  86     /*    Printing to stdout the corresponding year    */
  87     switch (year)
  88     {
  89         case FIRST:
  90             printf(FST_MSG"\n");
  91             break;
  92         case SECOND:
  93             printf(SND_MSG"\n");
  94             break;
  95         case THIRD:
  96             printf(TRD_MSG"\n");
  97             break;
  98         case FOURTH:
  99             printf(FTH_MSG"\n");
 100             break;
 101     }
 102     return OK;
 103 }
 104 
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