HackerRank Functions in C problem solution

HackerRank Functions in C problem solution – In this tutorial, we are going to solve HackerRank functions in C problem solution and write a program to solve this challenge.

Objective

In this challenge, you will learn simple usage of functions in C. Functions are a bunch of statements grouped together. A function is provided with zero or more arguments, and it executes the statements on it. Based on the return type, it either returns nothing (void) or something.

A sample syntax for a function is

	return_type function_name(arg_type_1 arg_1, arg_type_2 arg_2, ...) {
    	...
        ...
        ...
        [if return_type is non void]
        	return something of type `return_type`;
    }

For example, a function to read four variables and return the sum of them can be written as

	int sum_of_four(int a, int b, int c, int d) {
    	int sum = 0;
        sum += a;
        sum += b;
        sum += c;
        sum += d;
        return sum;
    }

+= : Add and assignment operator. It adds the right operand to the left operand and assigns the result to the left operand.

a += b is equivalent to a = a + b;

Task

Write a function int max_of_four(int a, int b, int c, int d) which reads four arguments and returns the greatest of them.

Note

There is not built in max function in C. Code that will be reused is often put in a separate function, e.g. int max(x, y) that returns the greater of the two values.

Input Format

Input will contain four integers – a,b,c,d, one on each line.

Output Format

Print the greatest of the four integers.
Note: I/O will be automatically handled.

Using this problem we are going to learn about functions in c programming. just for a note the input values will always be nonnegative.

HackerRank Functions in C problem solution.

#include <stdio.h>
/*
Add `int max_of_four(int a, int b, int c, int d)` here.
*/
int max_of_four(int a, int b, int c, int d) {
 int max = 0;
    
 if(max <= a) max = a;
 if(max <= b) max = b;
 if(max <= c) max = c;
 if(max <= d) max = d;
 return max;   
}

int main() {
    int a, b, c, d;
    scanf("%d %d %d %d", &a, &b, &c, &d);
    int ans = max_of_four(a, b, c, d);
    printf("%d", ans);
    
    return 0;
}

Explanation

In this program, we have first defined the main() function. inside the main function first we have defined four integer variables a, b, c, d. After that, we read the values from the input screen given by the user using the scanf() function.

After that, we called the internally defined function max_of_fours() and passed all four values.

What is inside the max_of_fours() function?

Inside the max_of_fours function first, we have defined a max variable that initially holds the 0 as a value. after that using the if condition we checked if the value of variable a was greater than max variable value. if the condition is true then we assign the value of a to max variable. similarly, we used the same condition to check the value of variable b, c, and d and assign it to the variable max.

after that, we returned the value of max from the function and stored it in the ans variable. and using the printf() function we have printed the value of ans variable on the output screen.