9HttMY - Online C Compiler & Debugging Tool

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

int myStrlen(char s[]){
    int i;
    for(i = 0; s[i] != '\0'; i++);
    return i;
}

char *setPalindrome(char s[]){
    char *tmp;
    char a;
    int i;
    int len = myStrlen(s);


    tmp = (char*)malloc(sizeof(char) * len * 2 );
    if(tmp == NULL){
        printf("ERROR\n");
        return 0;
    }
    for(i = 0; i < len; i++){
        tmp[i] = s[i];
    }
    for(i = 0; i < len ; i++){
        tmp[i+len]=s[len-(i+1)];
    }

    return tmp;
}

// メイン関数はいじらなくてOK
int main(){
    char nyuryoku[1024];
    char *kaibun;

    scanf("%s", nyuryoku);

    kaibun = setPalindrome(nyuryoku);

    printf("%s\n  -> %s\n", nyuryoku, kaibun);

    free(kaibun);

    return 0;
}