Rakefile

Rakefile

# coding: utf-8

CC = "gcc"

desc "the sum from 1 to 100"

task :default => "sum"

file "sum" => "sum.o" do
  sh "#{CC} -o sum sum.o"
end

file "sum.o" => "sum.c" do
  sh "#{CC} -c sum.c"
end

sum.c

// ©佐伯英子 http://saeki-ce.xsrv.jp/Cgengo.html
/********************/
/*  総和を計算する  */
/********************/
#include <stdio.h>
int  main( )
{
    int  sum=0,i=1;

    while( i<=100 )
      {
        sum+=i;
        i++;
      }

    printf("\n1 から 100 までの総和は %d です\n",sum);
}