tiger@animal ~ $ cat -n bar.c      1    #include <stdio.h>     2    #include <stdlib.h>     3    #include <ctype.h>     4    #include <unistd.h>     5         6    #define WIDTH 3     7    #define GAP 4     8         9    typedef struct tp tp;    10        11    int Nodes = 0;    12        13    struct tp{    14        int Temperature;    15        tp* Pnext;    16    };    17        18    void draw_bar(void);    19    tp* creat_link_list(void);    20    int max(tp*);    21    int min(tp*);    22    void print_bar(int);    23    void print_blank(void);    24        25    int main(void)    26    {    27        draw_bar();    28        return 0;    29    }    30        31    void draw_bar(void)    32    {    33        tp* First_Node = creat_link_list();    34        system("clear");    35        tp* Tmp = NULL;    36        int Highest= max(First_Node);    37        int Lowest= min(First_Node);    38        int Height = (Highest * Lowest) < 0 ? Highest : (abs(Highest) > abs(Lowest) ? Highest : Lowest);    39        int i, j, k;    40        printf("   ^\n   |\n");    41        while(Height >= (Lowest < 0? Lowest : 0))    42        {    43            Tmp = First_Node;    44            if(0 == Height)    45            {    46                printf(" 0 +");    47                for(i = 0; i < Nodes; ++i)    48                {    49                    for(j = 0; j < GAP; ++j)    50                    {    51                        printf("-");    52                    }    53                    for(k = 0; k < WIDTH; ++k)    54                    {    55                        printf("\033[31m-\033[00m");    56                    }    57                }    58                for(i = 0; i < GAP; ++i)    59                {    60                    printf("-");    61                }    62                printf(">");    63            }    64            else    65            {    66                printf("%03i|", Height);    67                while(Tmp != NULL)    68                {    69                    int Var = Tmp->Temperature;    70                    if((Var > 0 && Height > 0 && Var >= Height) || (Var < 0 && Height < 0 && Var <= Height))    71                    {    72                        print_bar(Var);    73                    }    74                    else    75                    {    76                        print_blank();    77                    }    78                    Tmp = Tmp->Pnext;    79                }    80            }    81            printf("\n");    82            --Height;    83        }    84        printf("   |\n");    85        printf("\n");    86    }    87        88    tp* creat_link_list()    89    {    90        tp* Current = NULL;    91        tp* Last = NULL;    92        tp* First = NULL;    93        char Test;    94        do {    95            Current = (tp *)malloc(sizeof(tp));    96            if(Current == NULL)    97            {    98                printf("Error occur!\n");    99                perror("malloc");   100                exit(1);   101            }   102            Current->Pnext = NULL;   103            if(First == NULL)   104            {   105                First = Current;   106            }   107            else   108            {   109                Last->Pnext = Current;   110            }   111            Last = Current;   112            printf("Please input an interger: ");   113            scanf("%i",&Current->Temperature);   114            ++Nodes;       115            getchar();   116            printf("Continue ? (Y/N)");   117            scanf("%c",&Test);   118        }while(tolower(Test) == ‘y‘);   119        return First;   120    }   121       122    int max(tp* First_Node)   123    {   124        tp* Tmp = First_Node->Pnext;   125        int Max = First_Node->Temperature;   126        while (Tmp != NULL)   127        {   128            if (Max < Tmp->Temperature)   129            {   130                Max = Tmp->Temperature;   131            }   132            Tmp = Tmp->Pnext;   133        }   134        return Max;   135    }   136       137    int min(tp* First_Node)   138    {   139        tp* Tmp = First_Node->Pnext;   140        int Min = First_Node->Temperature;   141        while(Tmp != NULL)   142        {   143            if(Min > Tmp->Temperature)   144            {   145                Min = Tmp->Temperature;   146            }   147            Tmp = Tmp->Pnext;   148        }   149        return Min;   150    }   151       152    void print_blank()   153    {   154        int i;   155        for (i = 0; i < (WIDTH + GAP); ++i)   156        {   157            printf(" ");   158        }   159    }   160       161    void print_bar(int Var)   162    {   163        int i, j;   164        for(i = 0; i < GAP; ++i)   165        {   166            printf(" ");   167        }   168        if(Var > 0)   169        {   170            for(j = 0; j < WIDTH; ++j)   171            {   172                printf("\033[33m#\033[00m");   173            }   174        }   175        else   176        {   177            for(j = 0; j < WIDTH; ++j)   178            {   179                printf("\033[37m#\033[00m");   180            }   181        }   182    }