73. WRITE A C PROGRAM TO EXPLAIN FUNCTION PROTOTYPE:

/*program to explain function prototype*/

#include<stdio.h>
// function prototype, also called function declaration
float square ( float x );
// main function, program starts from here
int main( )
{
float m, n ;
printf ( "\nEnter some number for finding square \n");
scanf ( "%f", &m ) ;
// function call
n = square ( m ) ;
printf ( "\nSquare of the given number %f is %f",m,n );
}
float square ( float x ) // function definition
{
float p ;
p = x * x ;
return ( p ) ;
}

output

Enter some number for finding square
2
Square of the given number 2.000000 is 4.000000