// Rolling a six-sided die 6,000,000 times.
#include <stdio.h>
#include <stdlib.h>
// function main begins program execution
int main( void )
{
unsigned int frequency1 = 0; // rolled 1 counter
unsigned int frequency2 = 0; // rolled 2 counter
unsigned int frequency3 = 0; // rolled 3 counter
unsigned int frequency4 = 0; // rolled 4 counter
unsigned int frequency5 = 0; // rolled 5 counter
unsigned int frequency6 = 0; // rolled 6 counter
unsigned int roll; // roll counter, value 1 to 6000000
int face; // represents one roll of the die, value 1 to 6
// loop 6000000 times and summarize results
for ( roll = 1; roll <= 6000000; ++roll ) {
face = 1 + rand() % 6; // random number from 1 to 6
// determine face value and increment appropriate counter
switch ( face ) {
case 1: // rolled 1
++frequency1;
break;
case 2: // rolled 2
++frequency2;
break;
case 3: // rolled 3
++frequency3;
break;
case 4: // rolled 4
++frequency4;
break;
case 5: // rolled 5
++frequency5;
break;
case 6: // rolled 6
++frequency6;
break; // optional
} // end switch
} // end for
// display results in tabular format
printf( "%s%13s\n", "Face", "Frequency" );
printf( " 1%13u\n", frequency1 );
printf( " 2%13u\n", frequency2 );
printf( " 3%13u\n", frequency3 );
printf( " 4%13u\n", frequency4 );
printf( " 5%13u\n", frequency5 );
printf( " 6%13u\n", frequency6 );
} // end main
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