// Creating and using a programmer-defined function.
#include <stdio.h>
int square( int y ); // function prototype
// function main begins program execution
int main( void )
{
int x; // counter
// loop 10 times and calculate and output square of x each time
for ( x = 1; x <= 10; ++x ) {
printf( "%d ", square( x ) ); // function call
} // end for
puts( "" );
} // end main
// square function definition returns the square of its parameter
int square( int y ) // y is a copy of the argument to the function
{
return y * y; // returns the square of y as an int
} // end function square
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