# HackerRank Functions solution in c++ programming

In this HackerRank Functions problem solution in the c++ programming language, Functions are a bunch of statements glued 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.

The 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 return the sum of four parameters 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;

}

Write a function int max_of_four(int a, int b, int c, int d) which returns the maximum of the four arguments it receives.

+= : 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;

## HackerRank functions problem solution in c++ programming.

```#include <iostream>
#include <cstdio>
using namespace std;

int max_of_four(int a, int b, int c, int d)
{
int data[]={a,b,c,d};
int max = data;
for(int i=1;i<=4;i++){

if(max<data[i])
max=data[i];
}
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;
}```

## Second solution

```#include <iostream>
#include <algorithm>
using namespace std;

int max_of_four(int a, int b, int c, int d) {
return max(max(a,b),max(c,d));
}

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;
}```

1. Noob question

what is
int data[]={a,b,c,d};
in the first solution?

looks like a string?

1. its an array

2. That's an array, we can store multiple datas of same kind in it.