# Functions in C

### Problem Statement :

```Objective:

In this challenge, you will learn simple usage of functions in C. Functions are a bunch of statements grouped 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;
}
+= : 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;

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.

Note:

There is not built in max function in C. Code that will be reused is often put in a separate function, e.g. int max(x, y) that returns the greater of the two values.

Input Format:

Input will contain four integers - a,b,c,d , one on each line.

Output Format:

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

### Solution :

```                            ```Solution in C :

#include <stdio.h>

int max_of_four(int a, int b, int c, int d) {
int max = 0;

if(max <= a) 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;
}```
```

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