C Programming Exercises, Practice, Solution : Variadic Function

Last update on March 20 2025 12:43:44 (UTC/GMT +8 hours)

This resource offers a total of 40 C variadic function problems for practice. It includes 8 main exercises, each accompanied by solutions, detailed explanations, and four related problems.

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Variadic functions are functions in C that can accept a varying number of arguments. These functions are declared with an ellipsis (...) in their parameter list, which means that they can take any number of arguments of any type. Variadic functions are typically used in situations where the number of arguments or their types are not known at compile time, but rather determined at run time. Some common examples of variadic functions in C include printf() and scanf().

The <stdarg.h> header file in C provides a set of macros and functions that allow a variadic function to access the variable argument list. Some of the commonly used macros and functions provided by <stdarg.h> are:

va_list: A type to declare a variable that will hold the variable argument list.
va_start: A macro that initializes a va_list variable to point to the first argument in the variable argument list.
va_arg: A macro that retrieves the next argument in the variable argument list with a specified type.
va_copy: A macro that copies a va_list variable to another one.
va_end: A macro that cleans up the va_list variable after it has been used.

1. Variadic Sum Function Challenges

Write a C program to find the sum of a variable number of integers passed as arguments to a function using variadic functions.

Expected Output:

s1 = 6, s2 = 15, s3 = -6

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2. Variadic Product Function Challenges

Write a C program to find the product of a variable number of integers passed as arguments to a function using variadic functions.

Expected Output:

s1 = 6, s2 = 15, s3 = -6

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3. Variadic Max-Min Function Challenges

Write a C program to find the maximum and minimum values of a variable number of integers passed as arguments to a function using variadic functions.

Expected Output:

Maximum value: 9
Minimum value: 0

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4. Variadic String Concatenation Challenges

Write a C program to concatenate a variable number of strings passed as arguments to a function using variadic functions.

Expected Output:

Original strings:
String-1: w3resource
String-2: .
String-3: com
Concatenate said strings: w3resource.com

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5. Variadic Character Count Challenges

Write a C program to count the number of characters in a variable number of strings passed as arguments to a function using variadic functions.

Expected Output:

Original strings:
String-1: w3resource
String-2: .
String-3: com
The total number of characters is 14

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6. Variadic Average Function Challenges

Write a C program to find the average of a variable number of doubles passed as arguments to a function using variadic functions.

Expected Output:

The average is: 25.350000

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7. Variadic printf() Implementation Challenges

Write a C program to implement the printf() function using variadic functions.

Expected Output:

The values are: 10 20 30

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8. Variadic Sorting Function Challenges

Write a C program to sort a variable number of integers passed as arguments to a function using variadic functions.

Expected Output:

1 3 5 7 9
-2 0 1

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C Programming Code Editor:

More to Come !

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