CodinGame_2023_08_23__23_17_00__upper.c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdbool.h>

/**
 * You need to create a program that retrieves all the uppercase letters from a specific text input.
 * However, if there are no uppercase letters found, the program should print the constant value None.
 * Players must reverse engineer the code to find the original uppercase letters or determine that there are none.
 *
 * Entrée:
 * string
 *
 * Sortie:
 * string
 *
 * Contraintes:
 *
 * Exemple:
 * Entrée:
 * abcdABCD
 * Sortie:
 * ABCD
 */

int main()
{
    char s[257];
    scanf("%[^\n]", s);
    int x=0;
    bool f=0;
    char tab[strlen(s)];
    int cpt=0;
    for (int i=0; i<strlen(s); i++) {
        if (s[i] >= 'A' && s[i] <= 'Z' ) {
            tab[cpt++] = s[i];
            f=true;
        }
    }
    if (!f) {
        printf("%s\n", "None");
    } else {
        printf("%s\n", tab);
    }

    return 0;
}