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  1. #define _GNU_SOURCE
  2.  
  3. #include <stdlib.h>
  4. #include <stdio.h>
  5. #include <string.h>
  6.  
  7. char *word[26][100];
  8. int nword[26];
  9.  
  10. int main()
  11. {
  12.     char *line = NULL;
  13.     size_t len = 0;
  14.     int i, j;
  15.  
  16.     while (getline(&line, &len, stdin) != -1) {
  17.         int index = -1;
  18.         int c = line[0];
  19.  
  20.         if ('a' <= c && c <= 'z') index = c - 'a';
  21.         if ('A' <= c && c <= 'Z') index = c - 'A';
  22.  
  23.         if (index >= 0 && nword[index] < 100) {
  24.             strtok(line, "\n");            
  25.             word[index][nword[index]++] = strdup(line);
  26.         }
  27.     }
  28.  
  29.     free(line);
  30.  
  31.     for (i = 0; i < 26; i++) {
  32.         printf("%c:", 'A' + i);
  33.  
  34.         for (j = 0; j < nword[i]; j++) {
  35.             printf(" %s", word[i][j]);
  36.             free(word[i][j]);
  37.         }
  38.         printf("\n");
  39.     }
  40.  
  41.     return 0;
  42. }
  43.  
Success #stdin #stdout 0s 2300KB
comments (?)
stdin
copy 
apple
apricot
cantaloupe
cherry
kiwi
mango
orange
papaya
peach
pear
strawberry
stdout
copy 
A: apple apricot
B:
C: cantaloupe cherry
D:
E:
F:
G:
H:
I:
J:
K: kiwi
L:
M: mango
N:
O: orange
P: papaya peach pear
Q:
R:
S: strawberry
T:
U:
V:
W:
X:
Y:
Z:
https://ideone.com/byQ4z8
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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