20131001国庆作业第二章例2-1,2-2,2-3

2-1

#include<stdio.h>
int main(void)
{
  printf("Hello World!
");


return 0;
}

2-2

#include<stdio.h>
int main(void)
{
printf("Programming is fun.
");
printf("And programming in C is even more fun!
");

return 0;
}

2-3

#include<stdio.h>
int main(void)
{
    int celsius,fahr;

    fahr=100;
    celsius=5*(fahr-32)/9;

    printf("fahr=%d,celsius=%d
",fahr,celsius);

    return 0;
}