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/* This program prints "Hello World!". */
#include <stdio.h>
main(){
  printf("Hello World!\n");
}

stdio.h

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/* program 1*/
#include <stdio.h>
#include <math.h>

main()
{
  float a,b,c,d,kai1,kai2,zitsubu,kyobu;
  a=2.0; b=3.0; c=1.0;
  printf(" %f x^2 + %f x + %f = 0\n",a,b,c);
  d=b*b-4*a*c;
  if(d==0){
    kai1 = -b/2/a;
    printf("root = %f\n", kai1);
  }else{
    if( d>0 ){
      kai1 = (-b + sqrt(d))/2/a; kai2 = (-b - sqrt(d))/2/a;
      printf("root1= %f, root2= %f\n",kai1,kai2);
    }else{
      zitsubu= -b/2/a; kyobu = sqrt(d)/2/a;
      printf("kai = %f +- %fi\n",zitsubu,kyobu);
    }
  }
}

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gcc C$B$N%U%!%$%kL>(B -lm

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---

$B:dK\D>;V(B [email protected]