栈应用之将二进制转化为十进制，八进制，十六进制

  1 #include<stdio.h>
  2 #include<stdlib.h>
  3 #include<math.h>
  4 
  5 #define INIT_STACK_SZIE 20
  6 #define STACK_INCREMENT 10
  7 #define OK 1
  8 #define ERROR 0
  9 
 10 typedef char Elemtype;
 11 typedef int Status;
 12 
 13 typedef struct SuqStack{
 14     Elemtype* base;
 15     Elemtype* top;
 16     int stackSize;
 17 }SuqStack;
 18 
 19 Status InitStack(SuqStack *s){
 20     s->base = (Elemtype*)malloc(sizeof(Elemtype) * INIT_STACK_SZIE);
 21     if(!s->base)
 22         return ERROR;
 23     s->top = s->base;
 24     s->stackSize = INIT_STACK_SZIE;
 25     return OK;
 26 }
 27 Status Pop(SuqStack *s,Elemtype *result){
 28     if(s->base == s->top)
 29         return ERROR;
 30     *result = *(--(s->top));
 31     return OK;
 32 }
 33 Status Push(SuqStack *s,Elemtype value){
 34     if(s->top - s->base == s->stackSize){
 35         s->base = (Elemtype*)realloc(s->base,sizeof(Elemtype) * (STACK_INCREMENT + INIT_STACK_SZIE));
 36         if(!s->base)
 37             return ERROR;
 38         s->top = s->base + INIT_STACK_SZIE;
 39         s->stackSize = INIT_STACK_SZIE + STACK_INCREMENT;
 40     }
 41     *(s->top) = value;
 42     s->top++;
 43     return OK;
 44 }
 45 int StackLength(SuqStack s){
 46     return s.top - s.base;
 47 }
 48 Status Binary2Decimal(){
 49     SuqStack s;
 50     InitStack(&s);
 51     Elemtype c;
 52     int i;
 53     int sum = 0;
 54     int len;
 55     printf("please enter binary number end of '#': ");
 56     scanf("%c",&c);
 57     while(c != '#'){
 58         Push(&s,c);
 59         scanf("%c",&c);
 60     }
 61     getchar();
 62     len = StackLength(s);
 63     for(i = 0; i < len; i++){
 64         Pop(&s,&c);
 65         sum = sum + (c-48) * pow(2,i);
 66     }
 67     printf("result is %d(10)\n",sum);
 68     return OK;
 69 }
 70 Status Binary2Octal(){
 71     Elemtype c;
 72     SuqStack s1;
 73     SuqStack s2;
 74     InitStack(&s1);
 75     InitStack(&s2);
 76     int i,j,k,len,len1,sum;
 77     printf("please enter binary number end of '#': ");
 78     scanf("%c",&c);
 79     while(c != '#'){
 80         Push(&s1,c);
 81         scanf("%c",&c);
 82     }
 83     getchar();
 84     len = StackLength(s1);
 85     for(i = 0; i < len; i = i + 3){
 86         sum = 0;
 87         for(j = 0,k = i; j < 3 && k < len; j++,k++){
 88             Pop(&s1,&c);
 89             sum = sum + (c-48) * pow(2,j); /* 1的ASCII=49
 90                               0的ASCII=48
 91                             */
 92         }
 93         //printf("%c\n",sum+48);
 94         Push(&s2,sum + 48);            //sum+48为ASCII码值
 95                             //栈中的元素的类型char
 96     }
 97     len1 = StackLength(s2);
 98     printf("the result is ");
 99     for(i = 0;i < len1; i++){
100         Pop(&s2,&c);
101         printf("%c",c);
102     }
103     printf("(8)\n");
104     return OK;
105 }
106 Status Binary2Hexadecimal(){
107     Elemtype c;
108     SuqStack s1;
109     SuqStack s2;
110     InitStack(&s1);
111     InitStack(&s2);
112     int i,j,k,len,sum,len1;
113     printf("please enter binary number end of '#': ");
114     scanf("%c",&c);
115     while(c != '#'){
116         Push(&s1,c);
117         scanf("%c",&c);
118     }
119     getchar();
120     len = StackLength(s1);
121     for(i = 0; i < len; i = i + 4){
122         sum = 0;
123         for(j = 0,k = i; j < 4 && k < len; j++, k++){
124             Pop(&s1,&c);
125             sum  = sum + (c - 48) * pow(2, j);
126         }
127         /* 0-------48         1-------49
128          * 2-------50         3-------51
129          * 4-------52          5-------53
130          * 6-------54         7-------55
131          * 8-------56         9-------57
132          * A-------65         B-------66
133          * C-------67         D-------68
134          * */
135         if(sum < 10)
136             Push(&s2,sum + 48);
137         else
138             Push(&s2,sum + 55);
139     }
140     len1 = StackLength(s2);
141     for(i = 0; i < len1; i++){
142         Pop(&s2,&c);
143         printf("%c",c);
144     }
145     printf("\n");
146 }
147 int main(){
148     //Binary2Decimal();
149     //Binary2Octal();
150     Binary2Hexadecimal();
151     return 0;
152 }