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## Hackerrank Functions Solution

Beeze Aal

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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

Input will contain four integers -  , one in each line.

Output 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 in cpp

Approach 1.

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

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



Approach 2.

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

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



Approach 3.

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

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