// Calculating compound interest
#include <stdio.h>
#include <math.h>
// function main begins program execution
int main( void )
{
double amount; // amount on deposit
double principal = 1000.0; // starting principal
double rate = .05; // annual interest rate
unsigned int year; // year counter
// output table column heads
printf( "%4s%21s\n", "Year", "Amount on deposit" );
// calculate amount on deposit for each of ten years
for ( year = 1; year <= 10; ++year ) {
// calculate new amount for specified year
amount = principal * pow( 1.0 + rate, year );
// output one table row
printf( "%4u%21.2f\n", year, amount );
} // end for
} // end function main
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