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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include <stdbool.h>
  4. #include <ctype.h>
  5.  
  6. bool isAllAlpha(const char *word) {
  7.     for (int i = 0; word[i] != '\0'; i++) {
  8.         if (!isalpha(word[i])) {
  9.             return false;
  10.         }
  11.     }
  12.     return true;
  13. }
  14.  
  15. int main() {
  16.     char str[100];
  17.     printf("Enter the String:\n");
  18.     fgets(str, sizeof(str), stdin);
  19.  
  20.     // Remove newline if present
  21.     if (str[strlen(str) - 1] == '\n') {
  22.         str[strlen(str) - 1] = '\0';
  23.     }
  24.  
  25.     // Check if entire string is alphabets (and spaces)
  26.     for (int i = 0; str[i] != '\0'; i++) {
  27.         if (!isalpha(str[i]) && str[i] != ' ') {
  28.             printf("ERROR\n");
  29.             return 0;
  30.         }
  31.     }
  32.  
  33.     // Process each word
  34.     char *ptr = strtok(str, " ");
  35.     while (ptr != NULL) {
  36.         int len = strlen(ptr);
  37.  
  38.         // Convert first and last characters to uppercase
  39.         if (len > 0) {
  40.             ptr[0] = toupper(ptr[0]);
  41.             if (len > 1) {
  42.                 ptr[len - 1] = toupper(ptr[len - 1]);
  43.             }
  44.         }
  45.  
  46.         ptr = strtok(NULL, " ");
  47.     }
  48.  
  49.     // Print the final result
  50.     printf("%s\n", str);
  51.     return 0;
  52. }
Success #stdin #stdout 0s 5320KB
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stdout
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Enter the String:
ERROR
https://ideone.com/x5KKzT
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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