Functions in C HackerRank Solution
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.
Sample Input
3
4
6
5
Sample Output
6
Solution:
#include <stdio.h>
int max_of_four(int a, int b, int c, int d) {
int max = a;
if (b > max) {
max = b;
}
if (c > max) {
max = c;
}
if (d > max) {
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;
}
Steps Used in solving the problem -
-
First, we included the required header file.
-
Then, we created a function that takes four integers as input and returns the maximum of them. It used conditions to check the maximum number.
-
Then, we created the main function. And declared four variables.
-
We used the scanf function to read the four inputs and store them in declared variables.
-
Then, we used our previously created function to check the greatest numbers among the four inputs.
-
At last, we used the printf function to print the result.
