Concepts:
Read data (with scanf function), algorithm for the computation of the maximum between 3 number and print the result (with printf function).

Text:
Implement a C program that reads 3 floating point variables and prints the maximum value between them

Solution:

max3.c

/* Program for the computation of the maximum value between 3 float numbers */
 
#include <stdio.h>
 
int main() {
	float x, y, z;	/* input data */
	float max;      /* output data */
 
	printf("Insert x value: ");
	scanf("%f", &x);
	printf("Insert y value: ");
	scanf("%f", &y);
	printf("Insert z value: ");
	scanf("%f", &z);
 
	if (x>y) /* find the maximum between x and y, and store it in the variable max */
		max=x;
	else
		max=y;
	if(z>max) /* compare z with max */
		max=z;
 
	printf("The maximum between %f, %f and %f is %f\n", x, y, z, max);
 
	return(0);
}