p2-9.c

SUN Solaris8平台下进程间通信

#include <stdio.h>
int main()
{
    int c,answer;
    printf ("1: This is a buffer test program. ");
    /* fflush();*/
    fprintf(stderr,"2: I hope this should be second line.\n");
    printf ("3 Hello, Are you a student? ");
    while(1){
        c = tolower(fgetc(stdin));
        answer=c;
        while (c != '\n' && c != EOF)     
           c = fgetc (stdin);      /* 忽略该行后面的字符*/
        if (answer == 'y'){        /* 如果是回答字符，响应回答. */
           printf("  Hope you have good score.");
           break;
        }
        else if (answer == 'n'){
           printf("  Hope you have good salary.");
           break;
        }
        else    /* 非回答字符，请求合法回答. */
           printf ("  Please answer y or n: ");
    }
    /* fflush(); */
    fprintf(stderr,"n-1: I hope this line should be last but one.\n");
    printf("\nn: Test over.\n");
}