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Chapter 10: Problem 1

What header file must you include in a program using character testing functions such as isalpha and isdigit?

Short Answer

Expert verified
Answer: To use character testing functions like isalpha() and isdigit() in a C program, include the header file , and in a C++ program, include the header file .

Step by step solution

01

Understanding character testing functions

Character testing functions like isalpha() and isdigit() are commonly used in C and C++ programs to check whether a given character is an alphabet or a digit. To use these functions, we must include the appropriate header file in our program.
02

Identifying the correct header file

The header file required for character testing functions is in C and in C++. Both header files contain the necessary function declarations and can be used depending on the programming language.
03

Including the header file in the program

To include the header file in a C program, use the following syntax: ```c #include ``` And for a C++ program, use the following syntax: ```cpp #include ```
04

Using character testing functions

After including the appropriate header file in your program, you can use character testing functions like isalpha() and isdigit() to check the given character. Here is an example using both functions in a C++ program: ```cpp #include #include int main() { char ch = 'a'; if(isalpha(ch)) { std::cout << ch << " is an alphabet." << std::endl; } if(isdigit(ch)) { std::cout << ch << " is a digit." << std::endl; } return 0; } ``` In this program, we test the variable 'ch' for being an alphabet or digit. The output will say that 'a' is an alphabet, as it satisfies the isalpha() condition.

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Most popular questions from this chapter

Look at the following code. What value will be stored in s after the code executes? char name[10]; int s; strcpy(name, "Jimmy"); s = strlen(name);

Assume c is a char variable. What value does c hold after each of the following statements executes? Statement \(\quad\) Contents of \(c\) \(c=\) toupper \(\left(^{\prime} a^{\prime}\right)\) ___ \(c=\) toupper \(\left(^{\prime} B^{\prime}\right)\) ___ \(c=\) tolower \(\left(^{\prime} D^{\prime}\right)\) ___ \(c=\) toupper \(\left(^{\prime} e^{\prime}\right)\) ___

True or False If the starting address of a C-string is passed into a pointer parameter, it can be assumed that all the characters, from that address up to the byte that holds the null terminator, are part of the string.

What header file must you include in a program using string/numeric conversion functions such as atoi and atof?

Assume that str1 and str2 are string class objects. Write code that displays "They are the same!" if the two objects contain the same string.
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