Problem :

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.

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;
}

You have to 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.

+= : 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;

Input Format :

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

Sample Input :

3
4
6
5

Sample Output :

6

Solution :

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

int max_of_four(int a, int b, int c, int d) {
    if (a > b)
        if (c > d)
            if (a > c)
                return a;
            else
                return c;
        else if (a > d)
            return a;
        else
            return d;
    else if (c > d)
        if (b > c)
            return b;
        else
            return c;
    else if (b > d)
        return b;
    else
        return 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;
}

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