#include<stdio.h> #include<string.h> char prog[80],token[8],ch; int syn,p,m,n,sum; char rwtab[6]={"begin","if","then","while","do","end"}; void scaner(); int main() { p=0; printf("\n please input a string(end with '#'):\n"); do{ scanf("%c",&ch); prog[p++]=ch; }while(ch!='#'); p=0; do{ scaner(); switch(syn) { case 11:printf("(%-10d%5d)\n",sum,syn); break; case -1:printf("you have input a wrong string:\n"); getchar(); return 0; default:printf("(%-10s%5d)\n",token,syn); break;} }while(syn!=0); getchar(); return 0; } void scaner(){ sum=0; for(m=0;m<8;m++) token[m++]=NULL; ch=prog[p++]; m=0; while((ch==' ')||(ch=='\n')) ch=prog[p++]; if(((ch<='z')&&(ch>='a'))||((ch<='Z')&&(ch>'A'))) {while(((ch<='z')&&(ch>='a'))||((ch<='Z')&&(ch>'A'))||((ch>='0')&&(ch<='9'))) {token[m++]=ch; ch=prog[p++];} p--; syn=10; for(n=0;n<6;n++) if(strcmp(token,rwtab[n])==0) {syn=n+1; break;} } else if((ch>='0')&&(ch<='9')) {while((ch>='0')&&(ch<='9')) { sum=sum10+ch-'0'; ch=prog[p++]; } p--; syn=11; } else switch(ch) { case '<':token[m++]=ch; ch=prog[p++]; if(ch=='=') { syn=22; token[m++]=ch; } else{ syn=20; p--; } break; case '>':token[m++]=ch; ch=prog[p++]; if(ch=='=') { syn=24; token[m++]=ch; } else{ syn=23; p--; } break; case '+':token[m++]=ch; ch=prog[p++]; if(ch=='+') { syn=17; token[m++]=ch; } else{ syn=13; p--; } break; case '-':token[m++]=ch; ch=prog[p++]; if(ch=='-') { syn=29; token[m++]=ch; } else{ syn=14; p--; } break; case '!':ch=prog[p++]; if(ch=='=') { syn=21; token[m++]=ch; } else{ syn=3; p--; } break; case '=':token[m++]=ch; ch=prog[p++]; if(ch=='=') { syn=25; token[m++]=ch; } else{ syn=18; p--; } break; case '*':syn=15; token[m++]=ch; break; case '/':syn=16; token[m++]=ch; break; case '(':syn=27; token[m++]=ch; break; case ')':syn=28; token[m++]=ch; break; case '{':syn=5; token[m++]=ch; break; case '}':syn=6; token[m++]=ch; break; case ';':syn=26; token[m++]=ch; break; case '"':syn=30; token[m++]=ch; break; case '#':syn=0; token[m++]=ch; break; case ':':syn=17; token[m++]=ch; break; default:syn=-1; break; } token[m++]='\0'; }怎么让输出结果value在前和code在后

在switch语句中，根据不同的情况，可以将value和code分别存储到两个不同的数组中，最后遍历两个数组，分别输出value和code即可。以下是修改后的代码：

#include<stdio.h> 
#include<string.h> 

char prog[80],token[8],ch; 
int syn,p,m,n,sum; 
char rwtab[6]={"begin","if","then","while","do","end"}; 

void scaner(); 

int main() { 
    p=0; 
    printf("\n please input a string(end with '#'):\n"); 
    do{ 
        scanf("%c",&ch); prog[p++]=ch; 
    }while(ch!='#'); 
    p=0; 
    do{ 
        scaner(); 
        switch(syn) { 
            case 11: printf("(%-10d%5d)\n",sum,syn); break; 
            case -1: printf("you have input a wrong string:\n"); 
                    getchar(); return 0; 
            default: break;
        } 
    }while(syn!=0); 

    // 存储value和code
    char value_arr[100][10]; 
    char code_arr[100][10]; 
    int value_index = 0;
    int code_index = 0;

    p = 0;
    do{ 
        scaner(); 
        switch(syn) { 
            case 11: sprintf(value_arr[value_index], "%d", sum); 
                    strcpy(code_arr[code_index], "value"); 
                    value_index++; 
                    code_index++; 
                    break; 
            case -1: printf("you have input a wrong string:\n"); 
                    getchar(); return 0; 
            default: strcpy(value_arr[value_index], token); 
                     strcpy(code_arr[code_index], "code"); 
                     value_index++; 
                     code_index++; 
                     break;
        } 
    }while(syn!=0); 

    // 输出value和code
    for (int i = 0; i < value_index; i++) {
        if (strcmp(code_arr[i], "value") == 0) {
            printf("(%-10s%5s)\n", value_arr[i], "");
        } else {
            printf("(%-10s%5s)\n", "", code_arr[i]);
        }
    }

    getchar(); 
    return 0; 
} 

void scaner(){ 
    sum=0; 
    for(m=0;m<8;m++) token[m++]=NULL; 
    ch=prog[p++]; 
    m=0; 
    while((ch==' ')||(ch=='\n')) ch=prog[p++]; 
    if(((ch<='z')&&(ch>='a'))||((ch<='Z')&&(ch>'A'))) {
        while(((ch<='z')&&(ch>='a'))||((ch<='Z')&&(ch>'A'))||((ch>='0')&&(ch<='9'))) { 
            token[m++]=ch; 
            ch=prog[p++]; 
        } 
        p--; 
        syn=10; 
        for(n=0;n<6;n++) 
            if(strcmp(token,rwtab[n])==0) { 
                syn=n+1; break;} 
    } 
    else if((ch>='0')&&(ch<='9')) { 
        while((ch>='0')&&(ch<='9')) { 
            sum=sum*10+ch-'0'; 
            ch=prog[p++]; 
        } 
        p--; 
        syn=11; 
    } 
    else 
        switch(ch) { 
            case '<':token[m++]=ch; ch=prog[p++]; 
                    if(ch=='=') { syn=22; token[m++]=ch; } 
                    else{ syn=20; p--; } 
                    break; 
            case '>':token[m++]=ch; ch=prog[p++]; 
                    if(ch=='=') { syn=24; token[m++]=ch; } 
                    else{ syn=23; p--; } 
                    break; 
            case '+':token[m++]=ch; ch=prog[p++]; 
                    if(ch=='+') { syn=17; token[m++]=ch; } 
                    else{ syn=13; p--; } 
                    break; 
            case '-':token[m++]=ch; ch=prog[p++]; 
                    if(ch=='-') { syn=29; token[m++]=ch; } 
                    else{ syn=14; p--; } 
                    break; 
            case '!':ch=prog[p++]; 
                    if(ch=='=') { syn=21; token[m++]=ch; } 
                    else{ syn=3; p--; } 
                    break; 
            case '=':token[m++]=ch; ch=prog[p++]; 
                    if(ch=='=') { syn=25; token[m++]=ch; } 
                    else{ syn=18; p--; } 
                    break; 
            case '*':syn=15; token[m++]=ch; break; 
            case '/':syn=16; token[m++]=ch; break; 
            case '(':syn=27; token[m++]=ch; break; 
            case ')':syn=28; token[m++]=ch; break; 
            case '{':syn=5; token[m++]=ch; break; 
            case '}':syn=6; token[m++]=ch; break; 
            case ';':syn=26; token[m++]=ch; break; 
            case '"':syn=30; token[m++]=ch; break; 
            case '#':syn=0; token[m++]=ch; break; 
            case ':':syn=17; token[m++]=ch; break; 
            default:syn=-1; break; 
        } 
    token[m++]='\0'; 
}

在上述代码中，我们新建了两个数组`value_arr`和`code_arr`，分别用来存储value和code。在第一次遍历中，如果当前`syn`的值为11，则说明当前token是一个数字，我们就将其存入`value_arr`中，并将`code_arr`对应位置的值设为"value"。如果当前不是数字，则说明当前token是一个代码标识符，我们将其存入`value_arr`中，并将`code_arr`对应位置的值设为"code"。在第二次遍历中，我们就可以遍历两个数组，分别输出value和code了。