Modifying printf output

Question

#include <stdio.h>
int main(){
   printf("asd");
return 0;
}

The task is without modifying this program, overwriting or using define, in windows environment, this program have to write out : Yourname asd Yourname. Any idea?

Answer 1

You can do it in a simple way. Global objects are created on the static memory area, they are allocated and initialized before the execution of main, and are freed after the execution of main. Here's the simple answer to your problem:

#include<iostream>

struct MyName {
public: 
    MyName() { printf("%s", "GaborRuszcsak\n"); }
    ~MyName() { printf("%s", "\nGaborRuszcsak\n"); }
};

MyName isGaborRuszcsak;

int main(int argc, char** argv){
    printf("asd");
    return 0;
}

Hope that helps.

Answer 2

You can do it like this (edited to read Yourname from stdin):

#include <stdio.h>
#include <string.h>
int main(){
    printf("asd");
    return 0;
}

int printf(const char *__restrict __format, ...)
{
    char str[106], scs[50];
    scanf("%s", &scs);
    strcpy(str,scs);
    puts(strcat(strcat(strcat(strcat(str," "), __format)," "),scs));
    return 1;
}

Here's a working demo.