// Class average program with sentinel-controlled repetition
#include <stdio.h>
// function main begins program execution
int main( void )
{
unsigned int counter; // number of grades entered
int grade; // grade value
int total; // sum of grades
float average; // number with decimal point for average
// initialization phase
total = 0; // initialize total
counter = 0; // initialize loop counter
// processing phase
// get first grade from user
printf( "%s", "Enter grade, -1 to end: " ); // prompt for input
scanf( "%d", &grade ); // read grade from user
// loop while sentinel value not yet read from user
while ( grade != -1 ) {
total = total + grade; // add grade to total
counter = counter + 1; // increment counter
// get next grade from user
printf( "%s", "Enter grade, -1 to end: " ); // prompt for input
scanf("%d", &grade); // read next grade
} // end while
// termination phase
// if user entered at least one grade
if ( counter != 0 ) {
// calculate average of all grades entered
average = ( float ) total / counter; // avoid truncation
// display average with two digits of precision
printf( "Class average is %.2f\n", average );
} // end if
else { // if no grades were entered, output message
puts( "No grades were entered" );
} // end else
} // end function main
0 comments:
Post a Comment