Coding Puzzle No. 11?

#include<stdio.h>
void main()
{
int a=1;
printf("%d %d %d %d",a,++a,a++,++a);
}

Coding Puzzle No. 10?

#include<stdio.h>

char*f="char*f=%c%s%c;main(){printf(f,34,f,34,10);}%c";
 
void main()
{
        printf(f,34,f,34,10);
}

Coding Puzzle No. 9?

#include <stdio.h>

void main()
{
        unsigned int i;
        for(i=1;i>-2;i--)
        printf("c aptitude");

}

Coding Puzzle No. 8?

#include <stdio.h>

void main()
{
int i=4;
switch(i)
{
    default:printf("zero");
    case 1: printf("one");
    break;
    case 2:printf("two");
    break;
    case 3: printf("three");
    break;
}
}

Coding Puzzle No. 7?

#include<stdio.h>

void main()
{
         int a=5,b=2;
         a^=b^=a^=b;
         printf("%d  %d",a,b);
}