MCQ - C language

Give your answer with explaination:
 
1) What will be output if you will compile and execute the following c code?

#define x 5+2

void main(){

    int i;

    i=x*x*x;

    printf("%d",i);

}

2) What will be output if you will compile and execute the following c code?

void main(){

char c=125;

    c=c+10;

    printf("%d",c);

}

3) What will be output if you will compile and execute the following c code?

void main(){

   float a=5.2;

  if(a==5.2)

     printf("Equal");

  else if(a<5.2)

     printf("Less than");

  else

     printf("Greater than");

}

4) What will be output if you will compile and execute the following c code?

void main(){

  int i=4,x;

  x=++i + ++i + ++i;

  printf("%d",x);

}

5)What will be output if you will compile and execute the following c code?

void main(){

  int a=10;

  printf("%d %d %d",a,a++,++a);

}
6)What will be output if you will compile and execute the following c code?

void main(){

   char *str="Hello world";

   printf("%d",printf("%s",str));

}
7) What will be output if you will compile and execute the following c code?

#define call(x,y) x##y

void main(){

int x=5,y=10,xy=20;

printf("%d",xy+call(x,y));

}
8) What will be output if you will compile and execute the following c code?

#define max 5;

void main(){

int i=0;

i=max++;

printf("%d",i++);

}