Hackerrank Functions Solution

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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;
}

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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;
}

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