Give the output on the screen of the following program

#include <stdio.h>

#define PRINT(format,x) printf(#x " = %"#format"\t",x)
#define NL putchar('\n');

#define PRINT1(f,x) PRINT(f,x);NL
#define PRINT2(f,x1,x2) PRINT(f,x1);PRINT1(f,x2)
#define PRINT3(f,x1,x2,x3) PRINT(f,x1);PRINT2(f,x2,x3)
#define PRINT4(f,x1,x2,x3,x4) PRINT(f,x1);PRINT3(f,x2,x3,x4)

int main()
{
     int x , y, z;

     x=y=0;
     while(y<10) ++y; x+=y;
     PRINT2(d,x,y);

     x=y=0;
     while(y<10) x+= ++y;
     PRINT2(d,x,y);

     y=1;
     while(y<10){
          x=y++;z=++y;
     }
     PRINT3(d,x,y,z);

     for(y=1;y<10;y++) x=y;
     PRINT2(d,x,y);

     for(y=1;(x=y)<10;y++);
     PRINT2(d,x,y);

     for(x=0,y=1000;y>1;x++,y/=10)
     PRINT2(d,x,y);

     for(x=0,y=1000;y>1;x++,y/=10) {
          PRINT2(d,x,y);}

     return 0;
}

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Difficulty level

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This exercise is mostly suitable for LEVEL 2 students

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x = 10	y = 10	
x = 55	y = 10	
x = 9	y = 11	z = 11	
x = 9	y = 10	
x = 10	y = 10	
x = 0	x = 1	x = 2	y = 1	
x = 0	y = 1000	
x = 1	y = 100	
x = 2	y = 10	 

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Looking for a more challenging exercise, try this one !!
Star pattern 22

Mistakes may occur. If, while solving, you come across any mistakes with the codes, please, don't hesitate to contact me so that we may correct it together, creating a better programming community.
All proposed suggestions are most welcomed. !!!