HackerRank Functions in C programming solution

In this HackerRank Functions in C programming problem solution,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.

HackerRank Functions in C programming problem solution.

#include <stdio.h>
/*
Add `int max_of_four(int a, int b, int c, int d)` here.
*/

int main() {
    int a, b, c, d, m1, m2;
    scanf("%d %d %d %d", &a, &b, &c, &d);
    int ans = (m1=a>b?a:b)>(m2=c>d?c:d)?m1:m2;
    printf("%d", ans);
    
    return 0;
}

Second 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;
}