Answer Posted / subbu[iit kgp]

the given program as it gives errors, with some
modifications as

#define fun(a,b,t) g ##t=(a);(a)=(b);(b)=g##t
float gfloat;
main()
{
float a=1.12,b=3.14;
fun(a,b,float);
printf("a=%4.2f,b=%4.2f",a,b);
}

gives the output as option c

What is the use of header?

1096

---

In cryptography, you could often break the algorithm if you know what was the original (plain) text that was encoded into the current ciphertext. This is called the plain text attack. In this simple problem, we illustrate the plain text attack on a simple substitution cipher encryption, where you know each letter has been substituted with a different letter from the alphabet but you don’t know what that letter is. You are given the cipherText as the input string to the function getwordSets(). You know that a plain text "AMMUNITION" occurs somewhere in this cipher text. Now, you have to find out which sets of characters corresponds to the encrypted form of the "AMMUNITION". You can assume that the encryption follows simple substitution only. [Hint: You could use the pattern in the "AMMUNITION" like MM occurring twice together to identify this]

2485

---

Why do we need functions in c?

1027

---

Distinguish between actual and formal arguments.

1087

---

What does the message "automatic aggregate intialization is an ansi feature" mean?

1193

---

What is atoi and atof in c?

1089

---

Why do we use header files in c?

1082

---

Explain the concept and use of type void.

1119

---

Explain #pragma statements.

1059

---

Explain what math functions are available for integers? For floating point?

1118

---

Write a program to maintain student’s record. Record should not be available to any unauthorized user. There are three (3) categories of users. Each user has its own type. It depends upon user’s type that which kind of operations user can perform. Their types and options are mentioned below: 1. Admin (Search Record [by Reg. No or Name], View All Records, Insert New Record, Modify Existing Record) 2. Super Admin (Search Record [by Reg. No or Name], View All Records, Insert New Record, Modify Existing Record, Delete Single Record) 3. Guest (Search Record [by Reg. No or Name], View All Records) When first time program runs, it asks to create accounts. Each user type has only 1 account (which means that there can be maximum 3 accounts). In account creation, following options are required: Login Name: <6-10 alphabets long, should be unique> Password: <6-10 alphabets long, should not display characters when user type> Confirm Password: Account Type: Login Name, Password and Account Type should be stored in a separate file in encrypted form. (Encryption means that actual information should be changed and Decryption means that Encrypted information is changed back to the actual information) If any of the above mentioned requirement(s) does not meet then point out mistake and ask user to specify information again. When Program is launched with already created accounts, it will ask for user name and password to authenticate. On successful authentication, give options according to the user’s type.

1991

---

Write a program to generate a pulse width frequency of your choise,which can be variable by using the digital port of your processor

3549

---

What is use of integral promotions in c?

1153

---

Explain what is meant by high-order and low-order bytes?

1053

---

What is meant by keywords in c?

1074

---