12maxn0.c

常用算法程序集(c语言描述) 第三版.rar

  #include "stdio.h"
  #include "12maxn.c"
  main()
  { int js[2];
    double eps,x[3];
    double maxnf(double [],int,int);
    eps=0.000001; x[0]=0.0; x[1]=0.0;
    maxn(x,2,eps,10,js,maxnf);
    printf("\n");
    printf("js(0)=%3d\n",js[0]);
    printf("x(0)=%e\n",x[0]);
    printf("x(1)=%e\n",x[1]);
    if (js[1]<0.0) printf("MIN:  ");
    if (js[1]>0.0) printf("MAX:  ");
    printf("z=%e\n",x[2]);
    printf("\n");
  }

  double maxnf(x,n,j)
  int n,j;
  double x[];
  { double y;
    n=n;
    switch(j)
      { case 0: y=(x[0]-1.0)*(x[0]-10.0)
                  +(x[1]+2.0)*(x[1]+2.0)+2.0;
                break;
        case 1: y=2.0*(x[0]-1.0); break;
        case 2: y=2.0*(x[1]+2.0); break;
        defaut: {}
      }
    return(y);
  }