为什么能只有一个if可以进行

Question

#include <stdio.h>
#include <stdlib.h>
int main()
{
    char response,c;
    int guess=50,a=0,b=100;
    printf("please give me a number y which is from 0 to 100 to guess\n");
    printf("if my guess is big piease say b,");
    printf("if my guess is small please say s\n");
    printf("your number is %d?",guess);
    while((response=getchar())!='y')
    {
        if(response=='n')
        {
           printf("Is it big or small?\n");
            if((c=getchar())=='s')
            {
                printf("%c",c);
                a=guess;
                guess=(b-a)/2+a;
                printf("%d",guess);
            }
            if((c=getchar())=='b')
            {
                b=guess;
                guess=(b-a)/2+a;
                printf("%d",guess);
            }
            printf("%d",guess);
            printf("%c",c);
        }
            else
            {
                printf("sb I don't know what you say.\n");
            }
       //printf("your number is %d?\n",guess);
        //printf("%c",c);
        while(getchar()!='\n')
            continue;

    }
    return 0;
}
为什么当我输入s的时候他不会进行if的判断而输入b才会呢？

Answer 1

#include <stdio.h>
#include <stdlib.h>
int main()
{
    char response,c;
    int guess=50,a=0,b=100;
    printf("please give me a number y which is from 0 to 100 to guess\n");
    printf("if my guess is big piease say b,");
    printf("if my guess is small please say s\n");
    printf("your number is %d?",guess);
    while((response=getchar())!='y')
    {
        if(response=='n')
        {
           printf("Is it big or small?\n");
           fflush(stdin);
           c=getchar();
            if(c=='s')
            {
                printf("%c",c);
                a=guess;
                guess=(b-a)/2+a;
                printf("%d",guess);
            }
            if(c=='b')
            {
                b=guess;
                guess=(b-a)/2+a;
                printf("%d",guess);
            }
            printf("%d",guess);
            printf("%c",c);
        }
            else
            {
                printf("sb I don't know what you say.\n");
            }
       //printf("your number is %d?\n",guess);
        //printf("%c",c);
        while(getchar()!='\n')
            continue;
 
    }
    return 0;
}