算法7---栈及其基本操作实现

  1 #include <Stdlib.h>
  2 #include <stdio.h>
  3 #include <string.h>
  4 
  5 #define MAXLEN 50
  6 
  7 typedef struct
  8 {
  9     int age;
 10     char name[10];
 11 }DATA;
 12 
 13 typedef struct stack
 14 {
 15     DATA data[MAXLEN];
 16     int top;   
 17 }stackType;
 18 
 19 stackType *inistack()
 20 {
 21     stackType *p;
 22     if (p=(stackType *)malloc(sizeof(stackType )))
 23     {
 24         p->top=0;
 25         return p;
 26     }
 27     return NULL;
 28 }
 29 
 30 int stackEmpty(stackType *s)
 31 {
 32     int flag;
 33     flag=(s->top==0);
 34     return flag;
 35 }
 36 
 37 int stackFull(stackType *s)
 38 {
 39     int flag;
 40     flag=(s->top==MAXLEN);
 41     return flag;
 42 }
 43 
 44 void clearStack(stackType *s)
 45 {
 46     s->top=0;
 47 }
 48 
 49 void freeStack(stackType *s)
 50 {
 51     if (s)
 52     {
 53         free(s);
 54     }
 55 }
 56 
 57 int pushStack(stackType *s,DATA data)
 58 {
 59     if ((s->top+1)>MAXLEN)
 60     {
 61         printf("overflow!\n");
 62         return 0;
 63     }
 64     s->data[++s->top]=data;
 65     return 1;
 66 }
 67 
 68 DATA popStack(stackType *s)
 69 {
 70     if (s->top==0)
 71     {
 72         printf("empty stack!\n");
 73         exit(0);
 74     }
 75     return (s->data[s->top--]);
 76 }
 77 
 78 
 79 DATA readStack(stackType *s)
 80 {
 81     if (s->top==0)
 82     {
 83         printf("the stack is empty!\n");
 84         exit(0);
 85     }
 86     return (s->data[s->top]);
 87 }
 88 
 89 int main()
 90 {
 91     stackType *stack;
 92     DATA data,data1;
 93     stack=inistack();
 94     printf("push stack!\n");
 95     printf("input name,age to push data!\n");
 96     do
 97     {
 98         scanf("%s%d",data.name,&data.age);
 99         if (strcmp(data.name,"0")==0)
100         {
101             break;
102         }
103         else
104         {
105             pushStack(stack,data);
106         }
107     }while(1);
108 
109     do
110     {
111         printf("pop stack operation!\n");
112         data1=popStack(stack);
113         printf("the pop stack data is (%s,%d)\n",data1.name,data1.age);
114     }while(1);
115 
116 
117     freeStack(stack);
118     return 0;
119 
120 }