This document provides a summary of important C++ header files needed for the Class XII CBSE CS exam. It lists header files such as iostream.h for input/output functions like cout and cin, string.h for string manipulation functions, ctype.h for character checking functions, and math.h for mathematics functions. It also includes an example question and answer about which header files are needed to concatenate two strings and output the result.

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IMPORTANT HEADER FILES
CLASS XII CBSE CS EXAM
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3. Name the header file(s) that
shall be needed for successful
compilation of
GIVEN CODE
EXAM WEIGHTAGE-2 MARKS

4. IOSTREAM.H
• setw()
• setprecision()
IOMANIP.H
• cout
• cin

5. STRING.H
•strlen()
•strcmp()
•strcmpi()
•strupr()
•strlwr()
• strcmp()
• strcpy()
•strcat()
• strcmpi()

6. CTYPE.H
•isupper()
•islower()
•isalpha()
•isdigit()
•isalnum()
•isdigit
•isspace()
• ispunct()
• toupper()
• tolower()

7. MATH.H
•sqrt()
•pow()
•abs()
•floor()
•ceil()
•sin()
•cos()
• tan()
• asin()
•acos()
• atan()

8. STDIO.H
•gets()
•puts()
STDLIB.H
• random()
• randomize()
•exit()

9. CONIO.H
•clrscr()
•getch()

10. EXAMPLE
Q.1) Which C++ header file(s) are essentially required
to be included to run/execute the following C++ code :
void main()
{
char *word1="Hello",*word2="Friends";
strcat(word1,word2);
cout<<word1;
}
ANS.
iostream.h – for cout
string.h – for strcat()

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