Answer / musa

swapping x and y using z as intermediary

memcpy(&z, &x, sizeof(x));
memcpy(&x, &y, sizeof(x));
memcpy(&y, &z, sizeof(x));

Answer / anish

Simple... use XOR (^) operator...
example suppose,
x=101 (binary)
y=010 (binary)
now,
Execute : x=x^y; -->> from LSB 1^0=1 0^1=1 1^0=1
now x=111
Execute : y=x^y; -->> from LSB 1^0=1 1^1=0 1^0=1
now y=101 (101 used to be the value of x)
Execute : x=x^y; -->> from LSB 1^1=0 1^0=1 1^1=0
now x=010 (010 used to be the values of y)

code snippet
{
x=10;
y=30;
//swap x and y
x=x^y;
y=x^y;
x=x^y;
}

now x=30 and y=10

any doubts please ask me....

How do you initialize pointer variables?

0 Answers  

---

/*what is the output for the code*/ void main() { int r; r=printf("naveen"); r=printf(); printf("%d",r); getch(); }

1 Answers   CDAC,

---

Explain about C function prototype?

0 Answers  

---

O,T,T,F,F,S,S,E,N,?,?,?,T,F,F,S,S,E,N

9 Answers   ADP,

---

How will you allocate memory to double a pointer?

1 Answers  

---

write a function for strtok()??

2 Answers   Verifone,

---

Write a program in C to reverse a number by recursive function?

1 Answers  

---

9.how do you write a function that takes a variable number of arguments? What is the prototype of printf () function? 10.How do you access command-line arguments? 11.what does ‘#include<stdio.h>’ mean? 12.what is the difference between #include<> and #include”…”? 13.what are # pragma staments? 14.what is the most appropriate way to write a multi-statement macro?

4 Answers   L&T,

---

int i=0,j; j=++i + ++i ++i; printf(" %d",j);

2 Answers   ME,

---

Why c is called top down?

0 Answers  

---

write a code for large nos multilication (upto 200 digits)

2 Answers   Persistent,

---

Not all reserved words are written in lowercase. TRUE or FALSE?

0 Answers  

---