# Hackerrank Functions in C Solution

Objective

In this challenge, you will learn simple usage of functions in C. 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.
Note: I/O will be automatically handled.

Sample Input

3
4
6
5


Sample Output

6


### Solution in c

Approach 1.

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

int main() {
int a,b,c,d;
scanf("%d %d %d %d",&a,&b,&c,&d);
if(a>b && a>c && a>d)
printf("%d",a);
else if(b>c && b>d)
printf("%d",b);
else if(c>d)
printf("%d",c);
else
printf("%d",d);

return 0;
}

Approach 2.

#include <stdio.h>

int max_of_four(int a, int b, int c, int d)
{
int max = a;
if(b > max)
max = b;
if(c > max)
max = c;
if(d > max)
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 <stdio.h>
//int max_of_four(int a, int b, int c, int 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;
}
int max_of_four(int a,int b,int c,int d)
{
if(a>b&&a>c&&a>d)
return a;
else if(c>a&&c>b&&c>d)
return c;
else if(b>a&&b>c&&b>d)
return b;
else
return d;

}