#include <stdio.h>

    int main(void){

    char * text;
    int i = 0;
    text = "abababababa";

    printf("Bitte eingeben\n");


    for(i=0; text[i]!=0; i++){
        if(text[i]=='a' || text[i]=='e' || text[i]=='i' || text[i]=='o' || text[i]=='u')
        {
        text[i] = 'x';
       }
    }
    printf("%s", text);

    return 0;
    }