Write a function that evaluates an expression in RPN that is given as a string.
To evaluate an expression in Reverse Polish Notation (RPN), we can use a stack data structure. In RPN, the operators follow their operands, and no parentheses are needed. The evaluation proceeds by reading the tokens (numbers and operators) from left to right.
Here is how the function works:
- Initialize ______ __________ ________ ________ ________ ______.
________ ___ _______ _______ _________ ____ __________.
________ ______ ______ _____ ______ _________ ____ ___.
____ _________ _____ ____ _________ ________ _______ ________ _________ ___ _______.
_________ _____ _________ ______ ______ ___ ______ _____ _______ ___.
___ _________ ________ ___ _____ _______.
____ _______ __________ _______ ___ _________ _____ _______ ___.
_____ _____ __________ ____ ______ _______ ________ _____ _____.
___ ____ ____ _______ _____ ______ _______ _____.
________ ____ ________ _________ ____ _______ ______ ______ _______ ________ _____.
____ ______ ___ ___ _______ ___ __________.
____ _______ __________ ________ __________ ________ ________ ______ _________ __________.
_____ __________ ______ _______ ________.
_________ ____ _____ _____ __________ ___ ____ ________ ______ ___ ____ _______.
_______ _______ _______ _________ _________ __________ ________.
_______ ________ _____ _________ __________ ____ ______.
___ __________ _________ _______ ______ _____ _____ ___ ____ ___ ______ __________.
___ _____ ________ _______ ________.
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Write the output of the following C codes, with proper justification for each.
i) main()
{
int x = 2, y = 2, z = 2;
x = y == z;
y = z == x;
z = x == y;
printf("%d", z);
} ii) main()
{
int x = -1, y;
x++;
y = x ? 2+x : 3-x;
printf("%d", y);
}
iii) main()
{ int i, j, a = 0;
for(i = 1, j = 1; i <= 5; j++)
{
a = a + i*j++; i = j;
}
printf("%d ", a);
}
iv) main()
{
int x = 5, y = 12;
int *p = &x, *q = &y, *r;
r = p;
p = q;
q = r;
printf("%d, %d", x, y);
}
v) func(int x)
{
static int a = 0;
a += x;
return(a);
}
main()
{ int p;
for(p = 1; p <= 5; ++p)
printf("%d", fun(p));
}
Given an integer n, what does the following function compute?
int function(int n)
{
int i;
for(i = 0; n != 0; n %=10, i++)
return i;
}
What do you understand by file organisation? Explain the methods of file organisation.
Explain the use of the string library functions strncpy() and strncat(), with the help of an example for each.
Define a structure of type hms containing three integer members, called hour, minute and second, respectively. Then define a union containing two members, each a structure of type hms. Call the union members local and home, respectively. Declare a pointer variable called time that points to this union.
Write a function that evaluates an expression in RPN that is given as a string.
Write the inorder, preorder and postorder traversals of the following binary search tree.
