Question

How to extract only words with first-letter uppercase from a string in C

Answer 1

#include <stdio.h> 
#include <string.h> 
#include <stdbool.h> 
  
bool IsUpper(char ch);
void GetUppercaseFirstLetterWords(char *s, char *UppercaseFirstLetterWords);
  
int main(void) {   
    char str[] = "C C++ c# Java php";
    char UppercaseFirstLetterWords[30] = "";
      
    GetUppercaseFirstLetterWords(str, UppercaseFirstLetterWords);
      
    puts(UppercaseFirstLetterWords);
      
    return 0;
}
  
void GetUppercaseFirstLetterWords(char *s, char *UppercaseFirstLetterWords) {
    char *p;
     
    p = strtok (s, " ");
    while (p != NULL) {
        if (IsUpper(p[0])) {
            strcat(strcat(UppercaseFirstLetterWords, p), " ");
        }
             
        p = strtok (NULL, " ");
    }
} 

bool IsUpper(char ch) {
    if (ch >= 'A' && ch <= 'Z')
        return true;
       
    return false;
}
 
 
 
        
/*
run:
     
C C++ Java
    
*/

 

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Answer 2

#include <stdio.h>
#include <ctype.h>
#include <string.h>
   
void extract_only_words_with_first_letter_upperrcase(char s[], char words[]) {
    char *token;
    char *delimiter = " ";
   
    token = strtok(s, delimiter);
    while (token != NULL) {
        if (isupper(token[0])) {
            strcat(words, token);
            strcat(words, " ");
        }
        token = strtok(NULL, delimiter);
    }
}
   
int main() {
    char s[] = "C is a General-purpose Computer pRogramming Language";
    char words[256] = "";
   
    extract_only_words_with_first_letter_upperrcase(s, words);
   
    printf("%s\n", words);
   
    return 0;
}
   
   
   
   
    
/*
run:
      
C General-purpose Computer Language 
    
*/

 

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