Question

How to find the characters that a string consists of in C

Answer 1

#include <stdio.h>

int main() {
    char string[] = "C is a general-purpose programming language";
    int char_set[256] = {0}; // ASCII
 
    for (int i = 0; string[i] != '\0'; i++) {
        char_set[(unsigned char)string[i]] = 1; // Mark character as seen
    }

    for (int i = 0; i < 256; i++) {
        if (char_set[i]) {
            printf("%c ", i);
        }
    }

    return 0;
}



/*
run:

  - C a e g i l m n o p r s u 
  
*/

 

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