c - 如何读取特定字符串的标准输入并对它们执行 bool 运算？

Question

我正在尝试从表单的标准输入读取文本文件

12  1 $2
30  3 $9
1   1 $5  asdf
0  23 $3
0   alpha
1   beta
2   gamma
3   delta

我希望第一个条件语句检查范围值并查看是否出现“alpha”、“beta”、“gamma”和“delta”。如果这些字符串之一不存在，那么我想使用 exit(1)。

我不太确定如何准确地将这些字符串存储在内存中或从标准输入中搜索它们。任何指导表示赞赏。

<小时/>

#include <stdio.h>
#include <stdlib.h>
int main(){
int x;
int y;
char type[3];

while(1){
  if(scanf("%d %d %s%*[^\n]%*c", &x, &y, type)!=3)break;
  if(x>30 || y>30 || x<0 || y<0)||!("alpha" && "beta"
&& "gamma" && "delta"))
// The above syntax is wrong, but I think it shows what I'm thinking.
// If one of those strings are not found, exit(1).      
{
    exit(1);
    }
  if(x==0 || y==0){
    goto X;
  }
//Do stuff
}
X:if((x==0 || y==0)==1){

//Do stuff
return(0);
}

}//end main

Answer 1

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

int main(void){
    int x;
    int y;
    char type[3];
    char kinds[16];
    int alpha, beta, gamma, delta;//flags
    int status;

    alpha = beta = gamma = delta = 0;
    while(1){
        if((status = scanf("%d %d %2s", &x, &y, type)) == 3){
            if(x > 30 || y > 30 || x < 0 || y < 0)
                exit(1);
            //valid data1
            //do stuff 
            puts("valid data1");//debug print
        } else if(status == 1){
            if(1 == scanf("%15s", kinds)){
                if(strcmp(kinds, "alpha")==0) alpha = 1;
                else if(strcmp(kinds, "beta")==0) beta = 1;
                else if(strcmp(kinds, "gamma")==0) gamma = 1;
                else if(strcmp(kinds, "delta")==0) delta = 1;
                //else /* unknown kind*/ ;
            }
        } else {
            break;
        }
        scanf("%*[^\n]");scanf("%*c");//clear upto end of line
    }
    if(!(alpha && beta && gamma && delta)){
        exit(1);
    }
    //valid data2
    //do stuff
    puts("valid data2");//debug print

    return 0;
}