Can somebody help me please?☺️

Question

hello to everyone. i have some exercises in C, but because i am a beginner, i don't know if th answers i give are right or wrong. can someone help me please?
exc1.
i should find the value of x and y each time
int x=5;
int y=3;
++x; // the value of x will be 6
y=--x; //the value of x and y will be 5
y+=x--; //the value of x will be 5 and the value of y will be 10
y-=x++; //the value of x will be 4 and the value of y will be 6
ex3
what should be the value of a[4] when:
int 1, a[5]; //will exist a[0], a[1], a[2], a[3], a[4], a[5]
for (i=0;i++) a[i]=4-i; //a[0]=4-0=4, a[1]=4-1=3 , a[2]=4-2=2, a[3]=4-3=1, a[4]=4-4=0
for((i=0;i++) a[i]=a[a[i]]; //So a[0]=a[a[0]]=a[4]=0 ==>a[0]=4

ex4
what will print if we vall the func(5,15)?
int func(int a, int b)
{ int i;
i=a; //i=5
if (i<b){ //indeed i<b (5<15)
i+=func(2*i,b); //i=i+2*i
printf("%d",i); //==> i=5+2*5=15
return(1);
}
return(0);
printf("%d\n",a);}
exc5
i)what is going to print the below code?
int *num_ptr, num;
num=20; num_ptr= &num;
printf("%d\n,num_ptr);

Answer 1

you could just put it into an ide 🤷‍♂️😅
and print the values after each line

Answer 2

Or you just do that in the Code Playground.

Answer 3

Well, write the solutions on paper - and then run the code and see how many of your answers were correct.

Answer 4

yes, i agree with you but i should do this exercises in the paper not in a ide. so i should now if those answers are correct or no.