// Counting letter grades with switch
#include <stdio.h>
// function main begins program execution
int main( void )
{
int grade; // one grade
unsigned int aCount = 0; // number of As
unsigned int bCount = 0; // number of Bs
unsigned int cCount = 0; // number of Cs
unsigned int dCount = 0; // number of Ds
unsigned int fCount = 0; // number of Fs
puts( "Enter the letter grades." );
puts( "Enter the EOF character to end input." );
// loop until user types end-of-file key sequence
while ( ( grade = getchar() ) != EOF ) {
// determine which grade was input
switch ( grade ) { // switch nested in while
case 'A': // grade was uppercase A
case 'a': // or lowercase a
++aCount; // increment aCount
break; // necessary to exit switch
case 'B': // grade was uppercase B
case 'b': // or lowercase b
++bCount; // increment bCount
break; // exit switch
case 'C': // grade was uppercase C
case 'c': // or lowercase c
++cCount; // increment cCount
break; // exit switch
case 'D': // grade was uppercase D
case 'd': // or lowercase d
++dCount; // increment dCount
break; // exit switch
case 'F': // grade was uppercase F
case 'f': // or lowercase f
++fCount; // increment fCount
break; // exit switch
case '\n': // ignore newlines,
case '\t': // tabs,
case ' ': // and spaces in input
break; // exit switch
default: // catch all other characters
printf( "%s", "Incorrect letter grade entered." );
puts( " Enter a new grade." );
break; // optional; will exit switch anyway
} // end switch
} // end while
// output summary of results
puts( "\nTotals for each letter grade are:" );
printf( "A: %u\n", aCount ); // display number of A grades
printf( "B: %u\n", bCount ); // display number of B grades
printf( "C: %u\n", cCount ); // display number of C grades
printf( "D: %u\n", dCount ); // display number of D grades
printf( "F: %u\n", fCount ); // display number of F grades
} // end function main
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