**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; Task: 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 :

` ````
#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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