Question

O 4,5,8,9
0 4,5, 72
0 4,5, 72, *, +, 2, +
O None
If Push(x) and Pop() are the functions used to push and pop elements from an integer stack:
void func(char *expr)
{
int i,m,n,r;
char C;
for(i=0; i < strlen(expr);iH)
{
C=expr[i];
if(isdigit(c)
push(C-48)
else if((c=='+')||(c=='*'))
{
pop();
pop();
= (c '+') ? num : n*m;
push(r);
>
else
{
printf("Error Processing");
}
}
printf("%c", pop());
>
m =
n =
Next Question
r =
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Answer 1

Answer:

and for 45*423*+* please anyone help

Answer 2

Instructions that store and retrieve an item on a stack. Push enters an item on the stack, and pop retrieves an item, moving the rest of the items in the stack up one level.

Explanation:

push(20);

stack: [20]

push(4);

stack: [20, 4]

pop();

Returns 4

stack: [20]

push(10);

stack: [20, 10]

push(6);

stack: [20, 10, 6]

pop();

Returns 6

stack: [20, 10]

pop();

Returns 10

stack: [20]

push(5);

stack: [20, 5]

top();

It returns 5

stack: [20, 5]